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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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#41 of 118 2001 Blazer blowing cold air by kcwebmonkey Jan 17, 2007 (2:08 pm)
#42 of 118 2001 blazer blowing cold air by kcwebmonkey Jan 17, 2007 (8:11 am)
I've already replaced the thermostat, which made no difference.   The car blows cold air until the temperature gauge gets up around 260, then suddenly drops down below 200.   Would my next step be to flush the cooling system? I don't see why it would be running hot though.   Thanks, Matt Replies to this message: repairdog (Jan 17, 2007 9:48 am) kcwebmonkey (Jan 17, 2007 2:08 pm)
#43 of 118 Re: 2001 blazer blowing cold air [kcwebmonkey] by repairdog Jan 17, 2007 (9:48 am)
Replying to: kcwebmonkey (Jan 17, 2007 8:11 am) Hope it wasn't going to 260 before you did the thermostat! How about a new Stant cap - appears that the old one is not holding pressure. Then could be a clogged radiator. Dex cool should be flushed and changed 3/36 and that GM 5/100 info was crap. Air in the system would be another reason for a temp buildup as steam was hitting the temp sender mounted on the drivers side head between the rear 2 plugs. Make sure the heater core flows and see if the 2 hoses entering the firewall are hot and squeeze and see if water flowing. Sometimes due to the high mounting of the heater core air gets trapped in it and you hear gurggling. Replies to this message: kcwebmonkey (Jan 17, 2007 2:08 pm)
#44 of 118 Re: 2001 blazer blowing cold air [repairdog] by kcwebmonkey Jan 17, 2007 (2:08 pm)
Replying to: repairdog (Jan 17, 2007 9:48 am) it was staying right around 200 before this week, when i noticed the problem and replaced the thermostat. i'll go ahead and replace the radiator cap as well, and if that doesn't help then i'll look into flushing the radiator/cooling system.   Thanks for the help.
#45 of 118 1999 Chevy Blazer Floor Vent Issues by rev7 Jan 16, 2007 (2:27 pm)
#46 of 118 1999 Chevy Blazer Floor Vent Issues by rev7 Jan 16, 2007 (9:56 am)
My 99 Blazer LS won't blow air out of the floor vents. When you put the selector to floor it defaults to the defrost. The defrost works well, the dash vents works well, ac blows cold and the heat blows hot. I had the pressure checked and it is within range.   It's pretty cold here in Iowa and we could use some heat blowing on our feet. Any help would be great.   I'm not for sure if there is a switch or a lever that moves the door that directs the air flow. I'm guessing that I have to take the dash apart to fix this - Is that something that is somewhat easy to do? Or is this going to cost me alot to have some shop fix it. Replies to this message: repairdog (Jan 16, 2007 2:27 pm)
#47 of 118 Re: 1999 Chevy Blazer Floor Vent Issues [rev7] by repairdog Jan 16, 2007 (2:27 pm)
Replying to: rev7 (Jan 16, 2007 9:56 am) Default for a bad vac line is defrost so open up the hood and on the drivers side check the rubber vac lines (5/32") from the top of the engine by the PCV over to the cannister and the other assorted ones and replace the rotten out ones - the final end one in the series is the plastic one to the heater selector. Probably will have to use some pliers to grab them and they are a black mess due to rot. The cannister one is often bad too and with alittle time a new piece can be put on (its in the fender and a feel to fit job).
#48 of 118 Problems in ventilation system Blazer LT 2000 by ital_tico Nov 17, 2007 (5:22 am)
Three days ago, the system have a short circuit and the alarm turn on. Now the short circuit was repaired but three things remains:   First: when I connect the remote control to open doors then the car open the 4 doors not only one.   Two: when I connect the lights of the car, the central control of the doors sound like I try to open the doors and is the only way to move the electric mirrors (at the door) to see the sides of the car.   Three: every time I put the ventilation system in my Blazer LT 2000 the air is very hot, even with air conditioning (probably I need to check this system too).   Any suggestions... Thanks in advance.
#49 of 118 Heating issues 01 Blazer by jenups07 Nov 24, 2007 (4:49 pm)
I live in WI and it's getting really cold outside. Well when I turn my heat on with the blower on 1 or 2 it blows warm air if it's above freezing if it's below freezing it's cold. Anything on blower 3 or 4 it's always cold. People tell me it's the heater core and to flush it. But when I looked under the hood the hoses from the radiator go to a canister type thing and then that leads into what I think is the heater core. So if I flush it what is that canister thing and will the flush not work then. I tried looking in my manual for a name for the canister thing and can't find a name I can find a pic though. Can someone help me?

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