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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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#95 of 118 1990 Chevy Blazer HVAC Controls by burdink Sep 09, 2008 (8:06 pm)
I have a little problem with my Blazers AC controls. Changing the AC settings between Max, Normal, and Bi-level does nothing as far as changing air flow. No matter which setting it try, the air only blows from the floor and dash vents. Any ideas? Replies to this message: ryan626 (Jan 12, 2009 5:20 pm)
#97 of 118 Heater Core 1999 Blazer by jrofne Sep 19, 2008 (6:10 am)
I am racking myself trying to finish removing the heater core. I have the entire dash out and removed three bolts under the hood. Are there more? (evidently) How do I get to them?
#98 of 118 no heat by cold99 Dec 30, 2008 (4:06 pm)
99 blazer-blower works fine but no warm air. heater core isnt leaking but cant tell by touching hoses if there is circulation. air wont blow through floor but will through vents and defroster. is there a heater control valve or a flap in the air box. whichever it is where is it located- need help with this one-this chevy is about to drive me nuts Replies to this message: dfhltd (Dec 30, 2008 5:34 pm)
#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

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