2003 trailblazer - heat not working, blows cold air. After the car is driven the air is still cool, but the passenger side still blows really cold. System never gets hot. Back vents are blowing too.

Asked by Nov 26, 2013 at 01:23 PM about the 2003 Chevrolet TrailBlazer LS

Question type: Maintenance & Repair

7 Answers

the thermostat is either stuck closed (if slow to rise to the H) or open (if it never gets to the H)~ get a new thermostat...change the coolant with fresh~ https://www.google.com/#q=2003+Chevrolet+TrailBlazer+LS+thermostat&tb m=shop

1 out of 1 people think this is helpful.

it's overheating?...or no~?

suspect the coolant has NEVER been changed seaonally, and has turned to muck and boulders~ surprised it still acts like coolant and hasn't buggered your heat-exchanger, radiator and waterpump by now~

1 out of 1 people think this is helpful.

Thanks judge_roy! I'm not overheating at all. The temp rises to normal operating temperature without a problem. But after you mentioned the coolant, I looked and it doesn't look good. Funny I asked to have it changed with service back in September and they (SEARS) said it was fine. Also I couldn't open the radiator valve. It was so tight and wouldn't budge. I will have the fluid flushed for sure now. I had the thermostat changed about 2 or 3 years ago now. So, I remember my engine would never heat up to normal operating temperature back then. But the heat inside the car worked fine back then.

could it be that your heater core is plugged?...you might pull off the lower radiator hose (forget the stopcock) to drain and flush the heatercore (gardenhose will tell you/blast the corrosion out of there)~ try to save the coolant into five gallon buckets (gnarly as it is) for recycling at the auto parts store~ I know OLD coolant...have been running with the same coolant in my truck for at least 8 years...just haven't got around to changing that...just one of those things....of course my driving around here barely lets me reach operating temperature~....but take it in for a "coolant flush" and heater core flush...if they can do the job without messin' it up~

1 out of 1 people think this is helpful.

I think you may be right about the heater core. I bought radiator flush and tried that. Everything seemed to improve. But then, it doesn't blow hot air all the time. Now my engine temp went all the way up. When I checked almost all of my fluid was gone. I must have a leak somewhere and I'm sure flushing the radiator caused it. Wherever it was leaking from is now unclogged. It's a slow leak so it may take a while to find. Might have to take it to someone now.

30

I have had this problem as well I have had the water pump, thermostat,heatercord,radiator cap,fan clutch already replaced and it continues to heat up and the reserve fills up. Can anyone give me any other options i have done it all!

3 out of 3 people think this is helpful.

Your Answer

Add photo

Related Questions

TrailBlazer

Looking for a Used TrailBlazer in your area?

CarGurus has 5,316 nationwide TrailBlazer listings starting at $1,700.

ZIP:

Search Chevrolet TrailBlazer Questions

Chevrolet TrailBlazer Experts

#1 Tom Demyan
Tom Demyan
Reputation 760
#2 bigdogracer
bigdogracer
Reputation 670
#3 tennisshoes
tennisshoes
Reputation 570
View All

Related Models For Sale

Used Chevrolet Tahoe
776 Great Deals out of 28,447 listings starting at $1,500
Used Jeep Grand Cherokee
843 Great Deals out of 68,691 listings starting at $864
Used GMC Envoy
50 Great Deals out of 2,395 listings starting at $1,800
Used Chevrolet TrailBlazer EXT
11 Great Deals out of 1,334 listings starting at $2,900
Used Ford Explorer
937 Great Deals out of 74,004 listings starting at $750
Used Chevrolet Silverado 1500
2,286 Great Deals out of 155,167 listings starting at $1,395
Used Chevrolet Impala
793 Great Deals out of 34,401 listings starting at $799
Used Dodge Durango
298 Great Deals out of 24,124 listings starting at $1,500
Used Chevrolet Blazer
1,343 listings starting at $1,995
Used Chevrolet Camaro
280 Great Deals out of 38,300 listings starting at $1,250
Used GMC Yukon
520 Great Deals out of 17,128 listings starting at $1,799
Used Ford F-150
2,692 Great Deals out of 212,369 listings starting at $1,000

Used Cars For Sale

2007 Chevrolet TrailBlazer LS For Sale
6 Great Deals out of 136 listings starting at $2,995