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#1
05-16-2005, 12:43 PM
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Intermittent Heat?
99 Blazer LS, 4dr 4WD. Bought this vehicle last December and loved how much heat this thing could put out. Then when Spring came obviously I didn’t use the heat much and didn’t notice anything wrong but then the other day I caught a chill and went for max heat and there was virtually no heat available. A bit warm but that’s it. So today I check it and max heat appears to be back! Vehicle was at operating temperature in all cases. Is there some reason heating capability would change so sporadically? Anything to check? (No changes have been made to the vehicle since I bought it other than oil)
Also, regardless of where my fan, temp, and vent settings are at, when this vehicle downshifts to pull a hill, I get air out of my mid-level vents. Is this common? Thanks
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72 MGB - My hobby 05 Envoy - My Pig 05 Corolla - Wife's driver 98 Camry - My driver 
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#2
05-16-2005, 01:32 PM
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Re: Intermittent Heat?
Where is the temp gauge sitting when the engine is up to temperature and completely warmed up?
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1995 Factory Blazer Service Manual for sale, PM if interested.
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#5
05-18-2005, 09:21 AM
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Re: Re: Intermittent Heat?
Quote:
 What the hell is "triple reversed flushed" haha...Does that mean 3 coolant flushes at $100 each ?? Please explain....
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1999 Blazer LS 4WD 4.3L "W" 2004 Silverado 2500HD Duramax 
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#6
05-18-2005, 01:43 PM
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Re: Re: Re: Intermittent Heat?
Quote:
They forward and reverse flush the heater core three times. They did it to mine at the dealer.
__________________
1995 Factory Blazer Service Manual for sale, PM if interested.
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#7
05-18-2005, 02:57 PM
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Re: Re: Re: Re: Intermittent Heat?
Quote:
Huh....didn't know that....sounds like a good idea though.....!!! Power flushing that way would get any crap out of the heater core for sure...
__________________
1999 Blazer LS 4WD 4.3L "W" 2004 Silverado 2500HD Duramax
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#8
05-18-2005, 06:09 PM
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Re: Intermittent Heat?
No so much power flushing, but reversing the flow direction of the flush to dislodge more debris and crud.
__________________
1995 Factory Blazer Service Manual for sale, PM if interested.
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#9
05-18-2005, 07:48 PM
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Had a similar situation, the problem was merely a clogged heater core. The coolant had crystallized in there and blocked it. A little compressed air did the trick but it's a good idea to have it flushed as mentioned.
Which leads us to another thing - the reason the heater core clogged was a faulty radiator cap. So if this is in fact the same problem you are having, check the radiator cap after flushing the heater core and replace if necessary (might be a good idea to jsut replace it anyway, they are cheap). Also be sure to completely refill the cooling system when you are done.
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