Last post on Oct 13, 2013 at 2:35 PM
You are in the GMC Safari & Chevy Astro
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GMC Safari, Chevrolet Astro, GMC Safari Cargo, Heating / Cooling, Van
#200 of 371 98 Chev Astro AWD heat/ac stuck on defrost & rear heat blowing cold air
Feb 19, 2009 (11:08 pm)
Hi, I have a 1998 Chevy Astro Van AWD, and the heat and ac is stuck on defrost. Also my rear heat stopped working shortly afterwards and just blows cold air. Please help me out.
#201 of 371 Re: 98 Chev Astro AWD heat/ac stuck on defrost & rear heat blowing cold air [des10]
Feb 20, 2009 (6:54 am)
As far as your heat being stuck on defrost I'd guess that you have a problem with your vacume lines. They typically get old and crumble especially where they come close to the heat of the engine. Replace or repair the vacume lines and that should fix your control problem. Not sure about the rear heat thing but vacume lines could be the problem there too.
#202 of 371 95 astro awd warm up problem
Mar 01, 2009 (11:04 pm)
I have two 95 awd astros. They both give me the same problems. At 10 degrees f they take a half hour to get to operating temp. I replaced the thermostats with 195f and did not help. The older astros that I've had I never had these problems, but they did not have the oil coolers. Could I bypass the oil cooler for the winter to help them warm up quicker?
#203 of 371 Re: 2003 ASTRO VAN BLOWER MOTOR [bassman3112]
Mar 24, 2009 (2:56 pm)
The blower motor is under the hood on the pass side. You have to remove the wiper and radiator bottles and also the head light, then take out the 7 bolts that hold the blower motor in.
Lastly you have to remove the squirrel cage (using an allen wrench) before the motor will come out.
#204 of 371 bad vacuum lines on 94 safari
Apr 09, 2009 (1:14 pm)
My vacuum lines are dead. The ball is broken and I have no idea where to start? Is there a place where I can find a diagram of the vacuum lines and also where can I buy new lines to replace the old ones? What happens in my car (94 safari 4.3l) is that the heating and cooling goes to the defrost position when I accelerate and I have no cruise control. The ball is there but not connected to anything. Any help would be appreciated.
#205 of 371 95 Astro: At first no blower now??
Apr 17, 2009 (3:25 am)
I have a 95 Astro I bought last year, high milage, in January heater blower would work sometimes but most of the time not. From what im getting from this sight that could be the vacuum lines.Would that not being fixed lead into other problems? Yesterday headin back to work on lunch van started to make noises then a burning smell. I got it back to the work lot and there it sits.I have never seen it over heat and although it was smouldering something it never lost any fluids. Seems to be coming from the pulley's. One person took a quick look and suggested that it is the A/C compressor?
I'm really hoping for a less expensive answer if there is one. Found this sight last night and want to say thanks to all that help with the good advise!
#206 of 371 Re: 95 Astro: At first no blower now?? [breezi]
Apr 17, 2009 (4:51 am)
Sounds like you have two problems. The blower motor not working is not the vacuum lines. When the vacuum lines crack you can't control where the air goes but the motor still blows air... usually only out of the defroster. I'd say that your blower motor is dying and or the resistor/wiring harness is burnt.
I have had a car in the past that had the A/C compressor freeze up so that is possible... I've not had your second problem with with my Safari... I did have to replace a blown serpentine belt at around 80,000 miles tho...
#207 of 371 Heater Fan Control on my 2002 Astro Van Question
May 20, 2009 (7:39 am)
The heater produces heat and also cool air when in the AC mode. Problem is the fan/blower only works in the first two positions. When I turn the control to the high setting there is no response. If I leave the control setting there the fan will come on every once in a while but not stay on steady. Everything works fine in the low and medium settings. The rear heater and AC fan works fine. Cany anyone suggest what may be a solution to my problem.
#208 of 371 Re: Heater Fan Control on my 2002 Astro Van Question [rab23465]
May 20, 2009 (7:43 pm)
I have had a '92 and now a '95 GMC Safari and this happened to both. On mine it was the fan relay switch located on the firewall inside the engine compartment above the blower housing on the passenger side. Go to your favorite parts store and have them show you which of the 2 relays mounted side by side it is. And it's cheap and easy to replace. The one I got for the '95 was a little larger in size than the original, so it didn't want to mount in the exact same spot, but with a little American ingenuity, I worked it out. They may be able to test your relay, and if that's not it, my next suspect would be the blower resistors. Again, they are located in the same area, I think mounted to the blower housing. You can test them with an ohmmeter, or if they're really bad, it will be quite obvious, since they will be charcoal. Again, ask the guys at the parts store. That's what they get paid for. Hope this helps, and good luck.
Jul 19, 2009 (4:26 pm)
hi i have a 1998 astro awd with f&r air and heat. today i had the air on high setting, and the blower motor started making a humming sound. i know i have or had a mouse in the interior of the van but i dont think that would cause the blower motor to hum. is it on its way out or is there a way to tighten up the blower motor up. also the rear air does not blow, the rear heat blows (cold) so i know it is not the motor, i think it is the switch because i pulled the switch away from the dash and and if you juggle and twist it around enough it comes on. any ideas on eather one of the problems would be greatly appricated, i don't want to have to take it to the mechanic for things i can do my self. thank you in advance