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1992 Cutlass Ciera 3.3L No Heat Blows Cold Air Only

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New User

Nov 6, 2012, 8:28 AM

Post #1 of 2 (1436 views)
1992 Cutlass Ciera 3.3L No Heat Blows Cold Air Only Sign In

I'm not a mechanic but i've worked on several used cars in my time.

No heat, blows cold air only. It doesn't blow any heat at all.

My car only has 130k miles. New radiator, new thermostat, new heater core, new hoses, and plenty of coolant (pre-95 ethylene glycol, NO dexcool). Blower motor is running once the engine has warmed up. Still only blows cold air. Autozone can't do a code check because it's older than a 96.

When I use the ac/heat controls they make the normal sounds they always have. And I can hear coolant going through my heater core. Unsure if this is a coolant temperature sensor or some other issue.

Vacuum lines are connected. No open connectors or cut wires that I can see other that where the radio used to be. Never had one of those in it. lol.

I'm not against replacing part after part, being as it's 20 years old and I want to keep it as long as possible. It's ran amazing the 2 years I've owned it. I've never had a/c, which I don't really care about. Less than a grand put into the car including it's sale price (i got a great deal from a friend). I know the a/c compressor needs replaced, but I don't think that will affect the heat. However, I'm not a mechanice, so here I am.

Any thoughts?

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 6, 2012, 8:34 AM

Post #2 of 2 (1432 views)
Re: 1992 Cutlass Ciera 3.3L No Heat Blows Cold Air Only Sign In

With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If they are both hot, the heat in that vehicle is controlled by a blend door that regulates heated air flow. In your car it is vacuum operated.


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