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Chevrolet Blazer Heating Ventilation and Air Conditioning

118 messages,  Last post on Nov 01, 2009 at 9:53 AM

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#115 of 118 2002 blazer heater problem.... by gunnysarge Oct 14, 2009 (3:48 pm)
Guys my WIFE'S 2002 blazer has no heat .. i pulled the return heater hose and NOTHING.. one side is hot and the other nothing( its a little wet but no running water)... ???? can I use a air line to maybe blow the core out??? or is it to late and i have to replace it......???? Replies to this message: jlflemmons (Oct 14, 2009 7:16 pm)
#116 of 118 Re: 2002 blazer heater problem.... [gunnysarge] by jlflemmons Oct 14, 2009 (7:16 pm)
Replying to: gunnysarge (Oct 14, 2009 3:48 pm) Backwash it using a garden hose, just don't crank the pressure up too high. Get garden hose repair fittings and install them on heater hoses a couple of feet long. One will be larger than the other. Hook the supply side hose to the "exit" tube on the core, and the drain side to the other. I *think* the smaller one is the supply side, but not sure.   Gently turn on the water and watch for crud to come through the drain side. Once it starts flowing freely, let it run until the water coming through is clear.   Put everything back together and get the system flushed and refilled with fresh Dexcool. Do not try to switch to standard antifreez unless the whole cooling system is flushed until the drain water is drinkable! (just kidding, but it needs to be completely flushed) Those two types of antifreeze will not play together, and even a little bit will cause problems.   With a little luck, the corrosion will not have eaten through the heater core.
#117 of 118 1999 Chevy S10 Blazer 4.3L engine by bigdaddy6886 Oct 31, 2009 (9:11 am)
Issue: no heat. A/C works fine, blower works fine, but it seems when I turn the temp control knob, it turns too easily. I understand there is a baffle that the knob controls to reroute from A/C to heat, but not sure where it is or how to get to it. My thermostat is fine, but going to replace it anyway, along with a new radiator cap. Have not completed a coolant flush, am scheduling that in the next couple of weeks. I also heard it might be some sort of relay switch, located under the hood near the firewall? Any assistance? Replies to this message: dfhltd (Nov 01, 2009 9:53 am)
#118 of 118 Re: 1999 Chevy S10 Blazer 4.3L engine [bigdaddy6886] by dfhltd Nov 01, 2009 (9:53 am)
Replying to: bigdaddy6886 (Oct 31, 2009 9:11 am) The first thing you should do is go to the dealer and get them to copy the diagrams from the parts catelog. There are acouple of them that show different views. Also get the pages which list the parts and description that go with the diagrams. this will help you find the baffels or doors (3) that control airflow and the parts that control them. Check the hoses at the firewall going in and out of the heater to see if they are hot.

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