Mechanics

NO HEAT FROM HEATER, OVERHEATS WHEN OUTSIDE TEMPS ABOVE APPROX 75°

2004 Chevrolet Blazer • 160,000 miles

Not sure if I have one issue or two. 2004 Chevy blazer, heater blows cold air ( pronoun initially random and only occurred about every 3rd or 4th time I started vehicle, gradually became worse over a month or so, now only blows cold air. Additionally, during warm weather, air conditioner blows good cold air, however auto overheats if outside temperatures are above approx. 75°. Turning air off does little to help reduce overheating. Have replace thermostats 3 times, replaced water pump and have had radiator flushed and checked out by a mechanic. Was told no issues with radiator. Not sure what issue is out where to turn next. Is this a common issue? Could it have something to do with heater core? Do I have two separate issues or are they related? If any idea on problem, what is estimated repair costs? Appreciate any assistance. Mammastone
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Mammastone
September 30, 2013.



When hot check rad for cold spots if there are any rad is bad it should be sametemp all over. Then have coolant system pressure checked for internal leaks.

Hmac300
Sep 30, 2013.