NO Heat and even colder air on deforst
1 Answer
John answered 3 years ago
Stuck thermostat, air pocket, how did you test the heater core? Defrost blows cooler because the defrost uses the air conditioning to remove moisture from the air to defog the window quicker. Check the heater core lines for heat in both lines once the engine is up to temp. oif they are both pretty warm it could be the temp blend door isn't getting vacuum to it to open. If one line is hot and the other is cold then you have a blockage, if the engine is hot and both are cold then that's a serious blockage.
Your Answer
Related Questions
-
NO Heat and even colder air on deforst 1 answer
I have cool air coming out in heater mode. I have already flush the radiator and also cleaned the heater cores. What else can be causing this?
2002 GMC Sonoma SL 2WD
-
Maintenance & Repair
-
When I turn on the headlights the fuse blows and I no longer have headlight or tail lights but the brake lights and turn signal still work. I even took out the bulbs and it still blows the fuse 2 answers
On my 1997 Sonoma when I turn on the headlights it blows the fuse and I even lose my tail lights but my brake light and turn signal still work. I took out all the bulbs and it still blows the fuse
GMC Sonoma
-
Maintenance & Repair
-
upon starting my 2001 gmc sonoma, this winter. After a short warmup i turned on the heater and nothing. No air blowing at all hot or cold. what should be the first thing i should check? 1 answer
TRUCK DOESN'T PROVIDE HEAT WHEN WHEN KNOB IS TURNED ON. NO SOUND AT ALL.
2001 GMC Sonoma SLS Extended Cab Short Bed 4WD
-
Maintenance & Repair
-
No tail lights on 01GMC Sonoma 2.2 5 answers
Had no ground power to tail lights added ground and worked for a day now back out. Replaced bulbs and sockets. Brake lights turn singals and back up lights work. Just no tail lights
2001 GMC Sonoma SLS Long Bed 2WD
-
Maintenance & Repair
-
91 GMC Sonoma cranks but no park 1 answer
My son overfilled the oil and drove on it.....he says as he was going up a hill it started to loose power until it finally died at the top of the hill. After having to get it towed back home we drai...
1991 GMC Sonoma 2 Dr SLE 4WD Extended Cab SB
-
Maintenance & Repair
Shortcuts
- GMC Sonoma Questions
- All Questions
- Ask a Question
- GMC Sonoma Reviews
- GMC Sonoma For Sale
Search GMC Sonoma Questions
GMC Sonoma Experts
| #1 |
|
parkle
Reputation
670
|
| #2 |
|
Mike Bonnell
Reputation
460
|
| #3 |
|
James Mayfield
Reputation
320
|
Related Models For Sale
Used Cars For Sale
Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.