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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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#99 of 118 Re: no heat [cold99] by dfhltd Dec 30, 2008 (5:34 pm)
Replying to: cold99 (Dec 30, 2008 4:06 pm) Your 99 probably works the same as my 96. There is no heater shutoff valve. Hot water flows through the heater core all the time. You should feel a really hot hose going into the heater. I think it's the outside hose. You should fix this problem first. Disconnect the hoses and see if they are obstructed. hook up a garden hose to the core and see if water flows through it freely. Try heavy doses of radiator cleaner and force water through the core in the reverse direction. Replace the thermostat. It's cheap and easy to replace. As for the rest. There is a flap that controls if air comes from outside and the AC evaporator or the heater. The actuators go bad. sometimes the bearing doesn't work and the flap rubs against the housing. If the hot water is going through the core and the air is cold this is the problem. There are other flaps for the defroster and the floor. Verify they move and if not determine if the actuator or the control is not working. There could be a damaged or disconnected control vacuum hose. I suggest going to the Chevy dealer and get photocopies of the duct and heater - AC which they will give you for free. It will help you locate the flaps and actuators.
#100 of 118 A/C Blows Only From Floor and Dashboard by ryan626 Jan 12, 2009 (5:14 pm)
Same problem as posting #95. My A/C broke and the heater core started leaking both within a short period of time on my 95 Blazer, 177K miles. I bypassed the heater core (I live in South FL) and I replaced the A/C compressor/drier/expansion valve and recharged the freon. So now the A/C is cold, but blows only from floorboard and dashboard vents. Mechanic checked the vacuum tube, said it is OK, said the problem is in the vent system. The vents make a hissing noise (very annoying), but I'm not willing to take it to a mechanic for another $500 repair bill, but if I can disassemble the dash and replace the problem part, I'll give it a try. Or maybe the A/C - Vent - Heat control switch has failed? Replies to this message: dfhltd (Jan 12, 2009 7:31 pm) rsher0001 (Apr 23, 2009 4:53 am) jlflemmons (Apr 23, 2009 6:32 pm)
#101 of 118 Re: 1990 Chevy Blazer HVAC Controls [burdink] by ryan626 Jan 12, 2009 (5:20 pm)
Replying to: burdink (Sep 09, 2008 8:06 pm) I have the same problem, my posting is # 100. I'm thinking that it's either the control switch or one of the vent doors has broken. Did you ever resolve your problem?
#102 of 118 Re: A/C Blows Only From Floor and Dashboard [ryan626] by dfhltd Jan 12, 2009 (7:31 pm)
Replying to: ryan626 (Jan 12, 2009 5:14 pm) I'm not sure if there is a question in #100. The vents are controlled by a flapper is the only way to describe it. They move by an actuator whch has a small gear with teeth. Either the the teeth are striped or the shaft for the flapper has jammed or the actuator doesn't work. I'm told the teeth being stripped or the shaft being stuck is most likely. If the teeth are stripped there is a reason like the flapper is stuck, so you may have two problems in one. The actuator may be turning and the plastic against pastic sound may sound like hissing. I'm not sure. Hissing could be air under pressure going past a partially open flapper. Like I said in the previous suggestion , get the Chevy dealer to make you a copy of the parts manual pictures showing all the parts (get the parts list that goes with it). The parts list will tell you what's what and that way you can find the flapper location that isn't working.
#103 of 118 Re: A/C Blows Only From Floor and Dashboard [ryan626] by rsher0001 Apr 23, 2009 (4:53 am)
Replying to: ryan626 (Jan 12, 2009 5:14 pm) I just ordered my second one of these  1 "ACDelco 15-72182 A/C And Heater Vacuum Control Valve" Misc.; $53.27 ... dealer wanted $900 to install ... $95 for part... Amazon.com Price $50.   Its a bear to get at bascially behind dash near the ashtray area screwed to the AC duct work... There are two screws on the backside of the valve that hold it in place... I nipped the mounting tabs on first one I installed so I can more easily replace it .. good thing I did ... these units get sticky and cause wierd air flows ... expect scars... lots of sharp edges in side the dash Replies to this message: jlflemmons (Apr 23, 2009 6:32 pm)
#104 of 118 Stealership prices by duntov Apr 23, 2009 (7:14 am)
Never go to a dealership to get service or repairs on a vehicle that is out of warranty. Dealerships have their hands full with warranty work on the new cars they sell and they discourage work on cars that are out of warranty. The dealership will give a car owner that has a car out of warranty a "courtesy bid" which will be far above and beyond the average independent auto repair shop labor cost. Today the dealerships make more money off warranty work than from new car sales.   1998-2002 Chevrolet Blazer (full size) A/C - Heater Solenoid Valve AC Delco #15-72182 GM- #16171742 MSRP: $120.57 Dealer Cost: $62.70
#105 of 118 Re: A/C Blows Only From Floor and Dashboard [rsher0001] by jlflemmons Apr 23, 2009 (6:32 pm)
Replying to: rsher0001 (Apr 23, 2009 4:53 am) Something else to watch for is the disintigration of the rubber vacuum lines running from the intake manifold to the vacuum canister and that area. They will croak after about 6-8 years and when they do, the AC blows out the floor.
#106 of 118 98 Blazer A/C problem by cach22 May 12, 2009 (2:56 pm)
'98 Blazer LS 4 door 4WD 130,000+ miles I do NOT have automatic temperature control. The A/C blows only hot air. The vents DO get warmer if I turn the temp dial to heat. I do not hear the compressor clutch engaging nor do I see/hear the accompanying load increase on the engine. I have checked the low side pressure and it actually reads high (in the red on the cheapo gauge that comes with the cheapo recharge kit).   How do you check the compressor to see if it is bad or not? Or, is there something else that may be causing this?   I replaced most of the A/C system a couple of years ago with the help of a mechanic friend. The compressor shelled and contaminated the system with bits of metal. We flushed, replaced parts and had the whole thing working great. About 3 months later I parked it... for about nine months. It was when I started driving it again that the A/C no longer worked. Replies to this message: dfhltd (May 12, 2009 4:05 pm) cach22 (May 13, 2009 2:49 pm) dfhltd (May 13, 2009 4:14 pm)
#107 of 118 Re: 98 Blazer A/C problem [cach22] by dfhltd May 12, 2009 (4:05 pm)
Replying to: cach22 (May 12, 2009 2:56 pm) First check the compressor is not frozen by seeing if you can turn the shaftthat engages the clutch. If you can't get leverage to do that then heres another idea. There is a wire that goes to the clutch. Disconnect that and supply 12 volts directly to the compressor clutch to see if it engages and the compressor will turn. Don't let it run very long! Just long enough to prove the compressor is turning.   Assuming that it will turn then the problem lies elsewhere. The wire you disconnected is the signal to engage the clutch and the electricity isn't getting through. This is because there are a couple of safety sensors checking for pressures in range. The fact that the low side is out of range indicates the low side sensor is not allowing the signal through. The high side may have a sensor too. In any event these are safety devices to prevent the compressor frombuilding up too much pressure and exploding the pipes and connectors. This is what happens when air gets in the system. The compresor will keep compressing the air until something bursts. Normally the coolant will be compressed from a gas to a liquid and pressure will remain normal. But you probably have lots of air in the system. Coolant leaks out generally through the seals where the hoses connect to the compressor and dryer etc. They have little O rings and special seals which may have cracks or are installed incorrectly. I got some seals from the auto part store that looked right but wern't. this part is really tricky and could be your problem. Anyway you have to get all the air out of the system before you recharge. You can't just add more coolant. That won't work. Then when you get it running again there is a test that can detect leaks which you should do around any thing that has seals in it. Good Luck   Doug Replies to this message: cach22 (May 13, 2009 2:49 pm) dfhltd (May 13, 2009 4:14 pm)
#108 of 118 Re: 98 Blazer A/C problem [dfhltd] by cach22 May 13, 2009 (2:49 pm)
Replying to: dfhltd (May 12, 2009 4:05 pm) Doug,   How easily should the shaft turn? I tried to turn it and it did not budge. I actually scraped some metal filings off trying to get it to spin. Do I remove the belt to try this? Or is it safe to say that it is frozen up? I priced a new compressor and I must say I am not looking forward to replacing this thing.   I have yet to try applying any voltage directly to it. I have to rig something up. Plus I need to wait until it stops raining.   Thanks,   Ken Replies to this message: dfhltd (May 13, 2009 4:14 pm)

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