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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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#111 of 118 Re: 98 Blazer a/c drip pan drain line [rjmac] by dfhltd Jun 06, 2009 (11:05 pm)
Replying to: rjmac (Jun 05, 2009 4:37 pm) I don't know if there even is a dripline but the sloshing doesn't have to do with that. If there is a drip line it has to be located under the evaporator which is bolted to the engine side of the firewall in the middle. I'm guessing there is a hole or something that lets condensation just drip out the bottom on the ground. The cover comes off so you could loook insdie and see if there is a hole in the bottom under the evaporator core. There may not even be a hole.   The sloshing noise probably is the heater. I noticed that the heater core is pretty high and the hoses leading to it are longer than they need to be so they arch up. If there is air inn the system it will goe to the highest spot which is the heater core and hoses. Re route the hosesso they are lower than the heater. Make them shorter if necessary. Then find a way to bleed the air out of the system. Once there is no air in the system the noise will go away.
#112 of 118 2000 Blazer with Auto Climate Control by phillip64 Jul 18, 2009 (2:43 pm)
Issue: I have no heat regardless of temperature control setting with the exception of when I set to full clockwise, and then gets hot as heck. AC works all too well and will freeze you out of vehicle. Again no adjustment with temperature control just cold as heck unless I turn temperature control fully clockwise, then heat takes over and it gets too hot in vehicle. Just a slight adjustment counterclockwise and all bets are off, no heat. Vehicle is equipped with auto climate control, just does not seem to work. Any and all advice welcomed. Thanks
#113 of 118 heater/air control by johnwny Sep 28, 2009 (8:16 am)
My air and heater both work but in differant settings. Air only works on far right of dial and heater on only works on center settings. Air/heat only blows out dash at you and alittle at windshield no matter what the setting on the dial. All fan settings work fine. Is it just a bad dial? Any ideas on this? Thanks Replies to this message: jlflemmons (Sep 28, 2009 8:41 am)
#114 of 118 Re: heater/air control [johnwny] by jlflemmons Sep 28, 2009 (8:41 am)
Replying to: johnwny (Sep 28, 2009 8:16 am) Check the vacuum lines running from the intake manifold over to a tee near the brake vacuum booster and on to the vacuum resevoir in the left front fender. Very common for these to rot and leak with age, and will cause the symptoms you have described.   Good luck
#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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