Ac blend door?
Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,464
Likes: 48
Ac blend door?
My 89 Corvette with the automatic HVAC is blowing only hot air. The lines are cold but no cold air in the car. I guess it is the blend door. Where is it and how do I test it the FSM did not have a description on trouble shooting. Thank you
Melting Slicks
Joined: Jan 2014
Posts: 2,192
Likes: 381
From: Lunenburg MA
On top of the engine side of the air box there is the blower motor controller. If you take that out, you can shine a light down and see the blend door position. If you see heater core, it's on heat. if you see evaporator... well, you get the idea.
Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,464
Likes: 48
Thank you. This weekend, I will hopefully get a look. Is the door operated by vacuum? or electric? Thank you
Pro
Joined: Jun 2008
Posts: 674
Likes: 235
From: Louisville Kentucky
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You have the C68 option. C68 is the Auto Climate Control System and is electric. The other type would be manual.
Last edited by jts90vette; Apr 8, 2021 at 05:47 PM.
Thread Starter
Drifting
Joined: Feb 2013
Posts: 1,464
Likes: 48
Someone on FB wrote me and said that this could be because of my LED lights. Evidently the headlights and the HVAC are on the same circuit. He put a cornering light bulb in the circuit and now his AC works. I am going to put back my Halogens on the weekend and see.
