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heat problem in my 2001 blazer

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Old 01-05-2006, 07:35 PM   #1
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heat problem in my 2001 blazer

When i turn my heat on i feel hot air for a split secound than it goes to cold. Tried the thermostat so far no success.. I dont wanna rip the dash apart if i dont have to. Any ideas? I was thinkin that maybe it was the switch that selects the temperature either hot or cold, any idea were to get one tried advanced auto online didnt have it. any websites to buy it? part number? Any ideas of what else it can be? Thanks alot this is my moms blazer and she needs heat asap...


-Glenn
Old 01-05-2006, 08:16 PM   #2
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Re: heat problem in my 2001 blazer

b4 you do anything drastic, have the coolant system flushed and have the tubes goin into the heater core flushed extra good, there probably gunked up like mine were, so i flushed everything and its nice now
Old 01-06-2006, 01:13 PM   #3
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Re: heat problem in my 2001 blazer

Quote: Originally Posted by viper500hcp
b4 you do anything drastic, have the coolant system flushed and have the tubes goin into the heater core flushed extra good, there probably gunked up like mine were, so i flushed everything and its nice now
agreed, it is most likely a clogged heater core, pull the hoses and flush it
Old 01-06-2006, 04:36 PM   #4
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Re: heat problem in my 2001 blazer

Mine did the same thing and so did my fathers 2002 buick.
I pulled off the heater hoses and back flushed the heater core with the garden hose (lot of crap came out of it)
Then I did a coolant flush as per the instructions on the bottle and topped it back up with 50/50 premixed havoline extended life coolant.

Works perfect now
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