No heat

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Apr 13, 2021 | 07:44 PM

Beater12

Thread Starter

Racer

Joined: Mar 2016

Posts: 344

Likes: 65

From: Ontario, Canada

No heat

On my 90 Vert the push button control on the dash switches from defrost to vent to floor just fine but I get no heat even when I set it to the 37 max?

Apr 14, 2021 | 01:48 PM

Beater12

Thread Starter

Racer

Joined: Mar 2016

Posts: 344

Likes: 65

From: Ontario, Canada

No one?

Apr 14, 2021 | 02:09 PM

PacerX

Burning Brakes

Joined: Nov 2000

Posts: 986

Likes: 487

Quote:

Originally Posted by Beater12

No one?

I have not diagnosed a no heat problem on a C4... And mines an 85.

But places to start:

1. Is the blend door moving?
2. Are the lines to and from the heater core warming up?

Do you own the factory service manual?

Last edited by PacerX; Apr 14, 2021 at 02:10 PM.

Apr 14, 2021 | 03:35 PM

Siveck

Drifting

Joined: Aug 2002

Posts: 1,775

Likes: 125

From: Birmingham AL

I’ve written a few posts about this. Search under my user name for blend door or cold solder joints on controller. I’ve had 2 89s with this same issue. First check for blend door operation. Remove resistor on blower box and observe door operation. Reheat cold joints on programmer board above gas pedal. Make a diagram of vacuum hoses because not all colors match. More details in prior post but that is the summary.

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