A/c blows nice and cold but no heat?
12-01-2017, 12:29 AM
#1
Intermediate
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Member Since: May 2017
Location: Dania beach Florida
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A/c blows nice and cold but no heat?
So my a/c blows nice and cold but I can't get it to blow any heat.
I live in south Florida ( so not a big deal) but every night I get a foggy windshield and not hot air to blow on my windshield to clear it up makes driving a little difficult at times.
Any help
1999 corvette 6 speed 50,000 miles .
I live in south Florida ( so not a big deal) but every night I get a foggy windshield and not hot air to blow on my windshield to clear it up makes driving a little difficult at times.
Any help
1999 corvette 6 speed 50,000 miles .
12-01-2017, 12:28 PM
#2
mike v
Are there any codes in your DIC....Do a search on the CF, lots of great info.. Could need reset also on the forum...
mike v
mike v
12-07-2017, 11:17 AM
#3
Burning Brakes
If you need to defog, turn on your AC. Defrost setting should turn it on anyway.
Also, could be your blend door actuators are broken. If you get a B036x code from your DIC, that's probably what it is. Usually the A/C isn't working though.
Also, could be your blend door actuators are broken. If you get a B036x code from your DIC, that's probably what it is. Usually the A/C isn't working though.
12-07-2017, 11:59 AM
#4
mike v
Re-Calibrating Actuators
By:
dadaroo
CF Senior Member
Use the following steps to perform the calibration update:
1. Turn OFF the ignition.
2. Remove the battery positive voltage circuit fuse of the HVAC Control Module (fuse #27) in the passenger fuse box.
Important: The module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds.
3. Wait 60 seconds.
4. Install the fuse.
This procedure reset the HVAC unit and must be done exactly as posted.
By:
dadaroo
CF Senior Member
Use the following steps to perform the calibration update:
1. Turn OFF the ignition.
2. Remove the battery positive voltage circuit fuse of the HVAC Control Module (fuse #27) in the passenger fuse box.
Important: The module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds.
3. Wait 60 seconds.
4. Install the fuse.
This procedure reset the HVAC unit and must be done exactly as posted.
12-08-2017, 02:45 PM
#5
Advanced
How long has it been since you flushed/replaced your coolant? Heater cores can clog up, liquid or air side.
Assuming you have air coming out when heat is selected but the air is simply not hot, you may have a blend door problem or a heater core problem.
If the problem is in the heater core, you can back flush it and see if that helps. That can be done through the hoses at the water pump.
If the problem is with the blend door, back flushing the heater core would not help (or hurt) anything.
I am not sure on the best diagnostic for an actuator problem, but given how deep inside the dash it is, I would want to try the heater core back flush first.
Assuming you have air coming out when heat is selected but the air is simply not hot, you may have a blend door problem or a heater core problem.
If the problem is in the heater core, you can back flush it and see if that helps. That can be done through the hoses at the water pump.
If the problem is with the blend door, back flushing the heater core would not help (or hurt) anything.
I am not sure on the best diagnostic for an actuator problem, but given how deep inside the dash it is, I would want to try the heater core back flush first.