Defrosting/Heat issue - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-03-2006, 10:26 PM   #1
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Default Defrosting/Heat issue

Well, shortly after winter showed up early and decided to tag along for the ride, I've been needing to defrost my windows in the morning. Sadly enough, I start it up and let it run for 15-20 minutes to defrost, only to come out ready to leave and find that it barely started defrosting. So, I get my scraper out and head to school... heat doesn't make itself very well known either...

By the way, this is fans on HIGH, temperature control all the way on red and defrost on/bi level heat when driving.
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Old 11-03-2006, 10:31 PM   #2
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If the airflow is good then check into the blend door followed by the heater core.
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Old 11-03-2006, 10:38 PM   #3
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And if the airflow isn't good?
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Old 11-04-2006, 12:04 AM   #4
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If the airflow isn't good, try this.

http://www.bonnevilleclub.com/forum/...e=article&k=63
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Old 11-05-2006, 08:53 AM   #5
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Also may want to cycle through all ventilation modes to exercise the doors. Do you get warmed air from any of the outlets? After 15-20 minutes of engine run you should have generated adequate heat in the compartment unless you're not getting coolant flow through heater core.
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Old 11-05-2006, 11:09 AM   #6
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Default Re: Defrosting/Heat issue

Quote:
Originally Posted by <tS>Ace*Of*Spades
Well, shortly after winter showed up early and decided to tag along for the ride, I've been needing to defrost my windows in the morning. Sadly enough, I start it up and let it run for 15-20 minutes to defrost, only to come out ready to leave and find that it barely started defrosting. So, I get my scraper out and head to school... heat doesn't make itself very well known either...

By the way, this is fans on HIGH, temperature control all the way on red and defrost on/bi level heat when driving.
What'* the temperature on the engine coolant gauge or DIC digital readout?

Do you get heat from the heater by that time when you put it in floor mode? If you're not getting hot heat from floor setting, could be a plugged heater core. May need a flush. Could be dirt on the outside of the heater blocking airflow if you don't get great air flow in high fan speed.

If not, I'd suspect a thermostate not closing tightly enough to heat up the motor.
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Old 11-05-2006, 12:30 PM   #7
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Right now I'm under suspicion that the heater core might be the problem. Airflow isn't an issue, and the radiator was recently replaced because the old one was cracked. Heater cores can go bad when the radiator does can't it?
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Old 11-05-2006, 03:50 PM   #8
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Quote:
Originally Posted by <tS>Ace*Of*Spades
Right now I'm under suspicion that the heater core might be the problem. Airflow isn't an issue, and the radiator was recently replaced because the old one was cracked. Heater cores can go bad when the radiator does can't it?
One check for heater core being blocked to water flow is after the car is hot put the blower on high and on full heat let it run for a while then feel both radiator hoses.

Typically the one will be hot with water going in and the other will be cooler. The water flows through slowly and the heat is extracted from the water by the blower. The water coming out is way cooler. You can try running the motor at 2000 rpm and see if that makes a difference pushing water through faster.

I had one blocked some and I disconnected the hoses and poured the radiator flush chemicals into it and let them sit. Drained and let them sit again. It dissolved some of the gunk.
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