Z31/hotairfromac php - Revision history

XenonzcarImporter: Rewrite 1 archive URL(s) to internal wikilinks

2026-05-17T01:59:28Z

Rewrite 1 archive URL(s) to internal wikilinks

← Older revision		Revision as of 01:59, 17 May 2026
Line 80:		Line 80:
	=== Sources Used ===		=== Sources Used ===

	[~~https://dev.z31library.com/xenonzcar_archive/z31~~/z31fsm.php 1984-1988 Nissan 300ZX Factory Service Manual]		[[Z31/z31fsm php\|1984-1988 Nissan 300ZX Factory Service Manual]]
	* Vacuum Line section Written by: Frank Zemaitis,		* Vacuum Line section Written by: Frank Zemaitis,
	* Water Cock Image by: PulseCode of Z31performance.com		* Water Cock Image by: PulseCode of Z31performance.com

XenonzcarImporter: Fix: convert markdown link syntax to wiki syntax; remove broken self-anchor links

2026-05-16T23:37:43Z

Fix: convert markdown link syntax to wiki syntax; remove broken self-anchor links

← Older revision		Revision as of 23:37, 16 May 2026
Line 15:		Line 15:

	There are also three vacuum lines that run back along the fender well to the		There are also three vacuum lines that run back along the fender well to the
	[		[https://dev.z31library.com/xenonzcar_archive/z31/images/AC%20repair/vacuumcanister.jpg vacuum canister]. Inspect all of these lines for cracks and leaks. Replace any that feel hard or brittle.
	~~vacuum canister~~
	](https://dev.z31library.com/xenonzcar_archive/z31/images/AC ~~repair~~/vacuumcanister.jpg). Inspect all of these lines for cracks and leaks. Replace any that feel hard or brittle.
	Most lines are color coded: at the canister there is a blue, a white, and a red striped line.		Most lines are color coded: at the canister there is a blue, a white, and a red striped line.
	Once identified, run new lines and remove the old ones.		Once identified, run new lines and remove the old ones.

XenonzcarImporter: Fix: convert markdown link syntax to wiki syntax; remove broken self-anchor links

2026-05-16T23:36:16Z

Fix: convert markdown link syntax to wiki syntax; remove broken self-anchor links

← Older revision		Revision as of 23:36, 16 May 2026
Line 50:		Line 50:

	3D Printed Mount:		3D Printed Mount:
	[		[https://dev.z31library.com/xenonzcar_archive/2025siteimages/actuator%20mount%201.stl Dorman 604-934 Actuator Mount]
	~~Dorman 604-934 Actuator Mount~~
	](https://dev.z31library.com/xenonzcar_archive/2025siteimages/actuator%20mount%201.stl)

	This is the easiest to use and mount—no need to modify the linkage. Simply remove the e-clip from the original actuator and swap it over. The Dorman 604-934 is a 2-stage actuator just like the original. The angle of the door may differ slightly but it should function properly.		This is the easiest to use and mount—no need to modify the linkage. Simply remove the e-clip from the original actuator and swap it over. The Dorman 604-934 is a 2-stage actuator just like the original. The angle of the door may differ slightly but it should function properly.
Line 63:		Line 61:

	3D Printed Mount:		3D Printed Mount:
	[		[https://dev.z31library.com/xenonzcar_archive/2025siteimages/actuator%20mount%202.stl Dorman 604-922 Actuator Mount]
	~~Dorman 604-922 Actuator Mount~~
	](https://dev.z31library.com/xenonzcar_archive/2025siteimages/actuator%20mount%202.stl)

	For installation, saw off the last 2 inches of the actuator, then put a right angle in the bracket and use the existing hole to butt against the hardware. Use the actuator's mounting slots to attach the 3D printed mount.		For installation, saw off the last 2 inches of the actuator, then put a right angle in the bracket and use the existing hole to butt against the hardware. Use the actuator's mounting slots to attach the 3D printed mount.
Line 78:		Line 74:

	3D Printed Mount:		3D Printed Mount:
	[		[https://dev.z31library.com/xenonzcar_archive/2025siteimages/actuator%20mount%203.stl Dorman 604-933 Actuator Mount]
	~~Dorman 604-933 Actuator Mount~~
	](https://dev.z31library.com/xenonzcar_archive/2025siteimages/actuator%20mount%203.stl)

	https://dev.z31library.com/xenonzcar_archive/2025siteimages/Dorman604-933Mods.png		https://dev.z31library.com/xenonzcar_archive/2025siteimages/Dorman604-933Mods.png

XenonzcarImporter: Reformat: split adjacent link runs into bulleted lists

2026-05-16T21:29:48Z

Reformat: split adjacent link runs into bulleted lists

← Older revision		Revision as of 21:29, 16 May 2026
Line 88:		Line 88:
	=== Sources Used ===		=== Sources Used ===

	[https://dev.z31library.com/xenonzcar_archive/z31/z31fsm.php 1984-1988 Nissan 300ZX Factory Service Manual]- Vacuum Line section Written by: Frank Zemaitis,		[https://dev.z31library.com/xenonzcar_archive/z31/z31fsm.php 1984-1988 Nissan 300ZX Factory Service Manual]
			* Vacuum Line section Written by: Frank Zemaitis,
	* Water Cock Image by: PulseCode of Z31performance.com		* Water Cock Image by: PulseCode of Z31performance.com
	* Vent Control Door Repair Written by: Nick Sturgis		* Vent Control Door Repair Written by: Nick Sturgis

	[[Category:Imported from Xenonzcar]]		[[Category:Imported from Xenonzcar]]

XenonzcarImporter: Inline image refs: rewrite to local archive; clean empty image artifacts

2026-05-16T18:01:29Z

Inline image refs: rewrite to local archive; clean empty image artifacts

← Older revision		Revision as of 18:01, 16 May 2026
Line 1:		Line 1:
	{{ImportedFrom\|site=Xenonzcar\|title=Z31 Getting Hot Air From AC even when set to cold temps\|url=~~http~~://~~www~~.~~xenonzcar~~.com/z31/hotairfromac.php.html\|archive=https://dev.z31library.com/xenonzcar_archive/z31/hotairfromac.php.html\|fetched=2026-05-15}}		{{ImportedFrom\|site=Xenonzcar\|title=Z31 Getting Hot Air From AC even when set to cold temps\|url=https://dev.z31library.com/xenonzcar_archive/z31/hotairfromac.php.html\|archive=https://dev.z31library.com/xenonzcar_archive/z31/hotairfromac.php.html\|fetched=2026-05-15}}

	== Z31 Getting Hot Air From AC even when set to cold temps ==		== Z31 Getting Hot Air From AC even when set to cold temps ==
Line 17:		Line 17:
	[		[
	vacuum canister		vacuum canister
	](~~http~~://~~www~~.~~xenonzcar~~.com/z31/images/AC repair/vacuumcanister.jpg). Inspect all of these lines for cracks and leaks. Replace any that feel hard or brittle.		](https://dev.z31library.com/xenonzcar_archive/z31/images/AC repair/vacuumcanister.jpg). Inspect all of these lines for cracks and leaks. Replace any that feel hard or brittle.
	Most lines are color coded: at the canister there is a blue, a white, and a red striped line.		Most lines are color coded: at the canister there is a blue, a white, and a red striped line.
	Once identified, run new lines and remove the old ones.		Once identified, run new lines and remove the old ones.
Line 27:		Line 27:
	==== Defrost Vents are the only ones getting any air and it is hot ====		==== Defrost Vents are the only ones getting any air and it is hot ====

	~~[http~~://~~xenonzcar~~.com/2025siteimages/actuatorschematic1.png ~~image: actuatorschematic]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/actuatorschematic1.png

	This issue is becoming more common as these cars age past 40 years. The main causes are vacuum lines running to the actuators that have perished or cracked, or failure of the actuators themselves. The most common actuators to fail are the blend door actuator and the defrost actuator.		This issue is becoming more common as these cars age past 40 years. The main causes are vacuum lines running to the actuators that have perished or cracked, or failure of the actuators themselves. The most common actuators to fail are the blend door actuator and the defrost actuator.
Line 52:		Line 52:
	[		[
	Dorman 604-934 Actuator Mount		Dorman 604-934 Actuator Mount
	](https://~~xenonzcar~~.com/2025siteimages/actuator%20mount%201.stl)		](https://dev.z31library.com/xenonzcar_archive/2025siteimages/actuator%20mount%201.stl)

	This is the easiest to use and mount—no need to modify the linkage. Simply remove the e-clip from the original actuator and swap it over. The Dorman 604-934 is a 2-stage actuator just like the original. The angle of the door may differ slightly but it should function properly.		This is the easiest to use and mount—no need to modify the linkage. Simply remove the e-clip from the original actuator and swap it over. The Dorman 604-934 is a 2-stage actuator just like the original. The angle of the door may differ slightly but it should function properly.

	~~[http~~://~~xenonzcar~~.com/2025siteimages/Dorman604-934.jpg ~~image: Actuator Installed]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/Dorman604-934.jpg

	==== Power Servo 1 ====		==== Power Servo 1 ====
Line 65:		Line 65:
	[		[
	Dorman 604-922 Actuator Mount		Dorman 604-922 Actuator Mount
	](https://~~xenonzcar~~.com/2025siteimages/actuator%20mount%202.stl)		](https://dev.z31library.com/xenonzcar_archive/2025siteimages/actuator%20mount%202.stl)

	For installation, saw off the last 2 inches of the actuator, then put a right angle in the bracket and use the existing hole to butt against the hardware. Use the actuator's mounting slots to attach the 3D printed mount.		For installation, saw off the last 2 inches of the actuator, then put a right angle in the bracket and use the existing hole to butt against the hardware. Use the actuator's mounting slots to attach the 3D printed mount.

	~~[http~~://~~xenonzcar~~.com/2025siteimages/Dorman604-922-1CUT.jpg ~~image: Actuator Trimmed]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/Dorman604-922-1CUT.jpg

	~~[http~~://~~xenonzcar~~.com/2025siteimages/Dorman604-922-bracket.jpg ~~image: Actuator Installed]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/Dorman604-922-bracket.jpg

	==== Power Servo 2 ====		==== Power Servo 2 ====
Line 80:		Line 80:
	[		[
	Dorman 604-933 Actuator Mount		Dorman 604-933 Actuator Mount
	](https://~~xenonzcar~~.com/2025siteimages/actuator%20mount%203.stl)		](https://dev.z31library.com/xenonzcar_archive/2025siteimages/actuator%20mount%203.stl)

	~~[http~~://~~xenonzcar~~.com/2025siteimages/Dorman604-933Mods.png ~~image: Actuator Modification]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/Dorman604-933Mods.png

	For this actuator, trim off the plastic mounting features and saw off the end of the linkage. The Dorman 604-933 has more travel than the OEM actuator, so the first half-inch of travel does nothing; the next inch actuates the assembly. Refer to the images below for modifications and mounting.		For this actuator, trim off the plastic mounting features and saw off the end of the linkage. The Dorman 604-933 has more travel than the OEM actuator, so the first half-inch of travel does nothing; the next inch actuates the assembly. Refer to the images below for modifications and mounting.
Line 88:		Line 88:
	=== Sources Used ===		=== Sources Used ===

	[~~http~~://~~www~~.~~xenonzcar~~.com/z31/z31fsm.php 1984-1988 Nissan 300ZX Factory Service Manual]- Vacuum Line section Written by: Frank Zemaitis,		[https://dev.z31library.com/xenonzcar_archive/z31/z31fsm.php 1984-1988 Nissan 300ZX Factory Service Manual]- Vacuum Line section Written by: Frank Zemaitis,
	* Water Cock Image by: PulseCode of Z31performance.com		* Water Cock Image by: PulseCode of Z31performance.com
	* Vent Control Door Repair Written by: Nick Sturgis		* Vent Control Door Repair Written by: Nick Sturgis

	[[Category:Imported from Xenonzcar]]		[[Category:Imported from Xenonzcar]]

XenonzcarImporter: XenonzcarImporter moved page Sites/Xenonzcar/z31/hotairfromac php to Z31/hotairfromac php without leaving a redirect: Flatten Sites/ namespace; provenance preserved via ImportedFrom banner

2026-05-16T06:38:41Z

XenonzcarImporter moved page Sites/Xenonzcar/z31/hotairfromac php to Z31/hotairfromac php without leaving a redirect: Flatten Sites/ namespace; provenance preserved via ImportedFrom banner

← Older revision	Revision as of 06:38, 16 May 2026
(No difference)

XenonzcarImporter: Site import

2026-05-16T06:27:31Z

Site import

New page

{{ImportedFrom|site=Xenonzcar|title=Z31 Getting Hot Air From AC even when set to cold temps|url=http://www.xenonzcar.com/z31/hotairfromac.php.html|archive=https://dev.z31library.com/xenonzcar_archive/z31/hotairfromac.php.html|fetched=2026-05-15}}

== Z31 Getting Hot Air From AC even when set to cold temps ==

On the Z31 300ZX there were two different designs of the Air Conditioning system: a manual system (used on GL models with slider controls for adjustment), and an automatic digital climate control system (offered on GLL models as well as the 50th Anniversary Edition). The digital system uses sensors to monitor and automatically adjust temperature and air flow.

This page discusses common problems and fixes for both systems.

==== Hot Air From A/C Vents ====

Commonly, air flow or temperature control issues are vacuum-related without a single universal cause or fix.

* Any leak in the vacuum system can cause not only heating and air conditioning issues, but also engine performance problems.
* Check the two vacuum lines at the firewall on the passenger side for cracks and leaks. One line goes through the firewall to supply vacuum to the climate control solenoid array, while the other controls the water cock.

There are also three vacuum lines that run back along the fender well to the
[
vacuum canister
](http://www.xenonzcar.com/z31/images/AC repair/vacuumcanister.jpg). Inspect all of these lines for cracks and leaks. Replace any that feel hard or brittle.
Most lines are color coded: at the canister there is a blue, a white, and a red striped line.
Once identified, run new lines and remove the old ones.

* White: Connects the manifold vacuum source to port M on the vacuum tank (should have a built-in one-way valve).
* Blue: Runs between the water cock and the magnet valve on the vacuum tank.
* Red: Goes between the interior door controls and a live feed from the tank, sometimes labeled as "F".

==== Defrost Vents are the only ones getting any air and it is hot ====

[http://xenonzcar.com/2025siteimages/actuatorschematic1.png image: actuatorschematic]

This issue is becoming more common as these cars age past 40 years. The main causes are vacuum lines running to the actuators that have perished or cracked, or failure of the actuators themselves. The most common actuators to fail are the blend door actuator and the defrost actuator.

Unfortunately, these are also the most difficult to access, as they're mounted on the back of the heater box, buried deep in the dash. This means the entire dash and heater core need to be removed for replacement. From experience, the smaller actuator on the back (blend door actuator) is especially hard to source.

However, you can use aftermarket actuators as replacements with the help of 3D printing for brackets or adapters. Thanks to Nick Sturgis for developing a process that makes this possible.

=== Parts Needed ===

* Dorman OE Solutions 604-922 — Vacuum Style Air Actuator
* Dorman 604-933 — Vacuum Style Air Door Actuator
* Dorman 604-934 — Vacuum Style Air Door Actuator
-
[Full Actuator Mounting Kit (3d Printed)](
https://www.paypal.com/instantcommerce/checkout/YZ8CYFUEYN7GU?fbclid=IwY2xjawL3UNFleHRuA2FlbQIxMABicmlkETFFOVp4dm9Yb0hycjVwY0IyAR7r7CpfocT8rSkMVSrdLmkrka1-m30PuD6JQumS7N47xK6oAx0pByPrQNy2XQ_aem_yLR3qDqiK2_WAE05vr3ibA
)

==== Intake Actuator ====

Actuator: Dorman 604-934

3D Printed Mount:
[
Dorman 604-934 Actuator Mount
](https://xenonzcar.com/2025siteimages/actuator%20mount%201.stl)

This is the easiest to use and mount—no need to modify the linkage. Simply remove the e-clip from the original actuator and swap it over. The Dorman 604-934 is a 2-stage actuator just like the original. The angle of the door may differ slightly but it should function properly.

[http://xenonzcar.com/2025siteimages/Dorman604-934.jpg image: Actuator Installed]

==== Power Servo 1 ====

Actuator: Dorman 604-922

3D Printed Mount:
[
Dorman 604-922 Actuator Mount
](https://xenonzcar.com/2025siteimages/actuator%20mount%202.stl)

For installation, saw off the last 2 inches of the actuator, then put a right angle in the bracket and use the existing hole to butt against the hardware. Use the actuator's mounting slots to attach the 3D printed mount.

[http://xenonzcar.com/2025siteimages/Dorman604-922-1CUT.jpg image: Actuator Trimmed]

[http://xenonzcar.com/2025siteimages/Dorman604-922-bracket.jpg image: Actuator Installed]

==== Power Servo 2 ====

Actuator: Dorman 604-933

3D Printed Mount:
[
Dorman 604-933 Actuator Mount
](https://xenonzcar.com/2025siteimages/actuator%20mount%203.stl)

[http://xenonzcar.com/2025siteimages/Dorman604-933Mods.png image: Actuator Modification]

For this actuator, trim off the plastic mounting features and saw off the end of the linkage. The Dorman 604-933 has more travel than the OEM actuator, so the first half-inch of travel does nothing; the next inch actuates the assembly. Refer to the images below for modifications and mounting.

=== Sources Used ===

[http://www.xenonzcar.com/z31/z31fsm.php 1984-1988 Nissan 300ZX Factory Service Manual]- Vacuum Line section Written by: Frank Zemaitis,
* Water Cock Image by: PulseCode of Z31performance.com
* Vent Control Door Repair Written by: Nick Sturgis

[[Category:Imported from Xenonzcar]]