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GMC Safari/Chevy Astro Heating / Cooling



  • rrc60rrc60 Posts: 1
    I recently had same problem. Fix was made by replacing vacuum line from manifold to A/C condenser box. The climate control valves are run by vacuum. Most likely you have a small vacuum leak.
  • 13tigger13tigger Posts: 1
    I have a 95 GMC Safari Van that I can't keep the relay working. The lower fan speeds go out, I replace the relay in the duct. All speeds work then for about 6 months then I need to replace it for the same reason. Does anyone know why I can't keep relays? Thanks 13Tigger
  • demaziiidemaziii Posts: 1
    There is a valve on one of the tubs coming from the compressor,it has a black cap,it is approximately 1" high, remove the black cap (unscrew cap to remove) to get to the valve (you can open or close valve with a flat screwdriver)
  • cobcob Posts: 210
    I found the valve. There were 3 different valves with black caps on them. One looked like the spot to fill the freon with a valve stem in it. Another one looked like a check ball in it for possibly discharging the system. The third on one of the lines had a stem sticking up about 1 inch that was round and came to a square at the top which could be turned with a wrench. I tried turning it left and right but it did not move either way. I did not want to put too much pressure on it fearing I would break it and let all the freon out. Is this the correct fitting? If so what is it supposed to be doing? If I turn it does it allow the freon to go through the line to the rear unit? Does it balance the pressure between front and rear? I could use some more input if you have any thank you. FYI while on a 5000 mile road trip last week when I had the dash control set on max a/c sometimes the rear unit would blow cold air especially when it was cooler out but, when we were in the southwest it just blew hot air from outside 100-115 deg.
  • pzmompzmom Posts: 1
    My air-conditioning quit blowing out into the cab low to high in Max A/C, A/C, or vent mode. Defroster works (blows cold air). Rear A/C works (I understand they are two different systems). I can hear the blower running. I checked the fuses, but they seem to be okay. I can't find anything in the manual on how, what, or where to check. Any ideas? Thanks!
  • I just fixed this same problem on my 2000 Astro last night. The vent system is vacuum operated and a vacuum leak will cause the symptom you have described. The most common cause on the Astro/Safari is a cracked vacuum line that runs across the top of the motor towards the front. The vacuum line is exposed to high heat continually and gets brittle and begins to crack in numerous places. The reduced vacuum causes the A/C vent selector to not operate properly. The vacuum line has 90 degree rubber elbows at each end and the rest of the line is very small diameter plastic tubing. One end it accessible under the hood on the left side near the A/C equipement, the other end is accessible if you pull the engine cover and is on the driver side of the intake manifold. I just replaced the whole vacuum line with rubber vacuum host and rerouted it off the top of the engine and put some shielding on it. HTH
  • tkwtkw Posts: 29
    There're lots of discussions on this subject on recent posts. What eharston posted is correct except that the entire job can be done from under the hood. It is a bigger job to remove the dog house than the actual repair. I found it out the hard way. You don't want to mess around with it.
  • machicjmachicj Posts: 2
    i have a '99 astro and yesterday the rear a/c blower quit. i checked the fuse, (#12) and it looks fine. also checked the a/c relay under the hood, but don't know how to tell whether its good or not. any suggestions? thanks
  • The Blower on my 1994 Astro will not blow on "High". The A/C Compressor remains engaged even though the fan doesn't blow. I replaced the Blower Control Switch in the dash thinking that would fix the problem. $29.00 later...the blower still will not blow on high. I am not an electrical whiz when it comes to trouble shooting . Any tips would be helpful before I go out and buy a resistor, fan motor,...a new van?
  • iwhiteyiwhitey Posts: 3
    I have an ac problem that I can't seem to find the answer for. Basically, the compressor won't shut off in any position of the vent dial, even if it's off or the heat is on. Any ideas?
  • rayj3rayj3 Posts: 1
    I have a 95 astro van with dual a/c ,my blower motor stops on all speeds for a short time and starts up after a minute or less.Can someone tell me where a relay or thermal fuse could be located for this intermittent problem.I already replaced the blower motor since new.
  • bymechbymech Posts: 1
    I have the opposite problem, My rear a/c factory install blows cold air, my front vents blow warm air. Anyone have any suggestion,will be greatly appreciated
  • davet2davet2 Posts: 1
    under the front hood remove the air box and u can see the small hard vacuum line where it has been damaged. One inch of rubber hose can connect the ends and a/c will return to blowing out every vent.
  • tkwtkw Posts: 29
    Thank you but I had it replaced & rerouted a while back. When that small vacuum line got brittle with engine heat & age, it just disintegrated in many pieces. Splicing was not an option in my case.
  • i have a 96 astro awd with rear heat, the problem is i am not getting any heat. The blower is coming on but no heat is coming out only blowing cold air

    please help winter is here.
  • :cry: i really hope someone can talk me through fixing my heater problems. i bought my van a year ago and up until now i have had only the high setting on my heater and only works on defost. now that it is cold out the heater has totally stopped. i tapped the blower motor housing and it started up. did this 3 times and then nothing. now i have to drive around with the windows down just so the front windsheid stays somewhat clear. can someone please tell me if it is a fuse or the blower motor itself. thank you
  • 97xpresso97xpresso Posts: 249
    It spunds like you have two separate problems. Your blower moter is probably shot, and the vacuum line that controls the vents is rotted. (you can search the fix for the 2nd problem earlier in this Astro board.)
  • Check resistor board located behind fluid reservoirs just to the right from blower motor. Disconnect plug and undo two screws holding it in place. Remove by pulling it out (can be little hard because of some sealant around). Check for burns. Repair if you can, or replace it.
  • I had the same problem as yours. My fan only worked on HIGH while on DEFROST.

    Here is my solution:

    1) Check your blower fan relay, located on the firewall above the blower fan compartment. Mine was OK. I had to remove some corrosion from the wire connector pack. Spray occasionally with WD40 to prevent further corrosion.

    2) Check your blower fan resistor pack. It is located on top of the AC/blower fan compartment. Mine was rusty. I cleaned it with some sandpaper and a wire brush. If yours is really bad or burnt out, replace it, otherwise it can be cleaned with no problems.

    3) If your fan doesn't work at all, replace it.

    4) If cleaning the connections doesn't help, and your fan still only works on HIGH while on DEFROST, then your fan switch and wire harness connector in the dash are no good. REPLACE THESE AS A PAIR. My switch and wire harness connector were melted. When a blower fan is failing, it draws more current than normal, causing the wires and switch the heat up at the point of connection. This melts the plastic and makes an even poorer connection. I bought a used switch and harness at an auto wrecker for CDN$5. After solder-splicing each wire and carefully taping, everything works just great.

    If you replace the switch and wire harness connector, IT IS VERY IMPORTANT TO REPLACE THE BLOWER FAN MOTOR ALSO, otherwise the switch and wires will melt again because the motor is failing.

    Make sure to check a few vans at an auto wrecker for a good switch and harness connector. I had to look at about 5 vans before I found one good enought to buy.

    Hope this helps. Good Luck.
  • Please let me know if you can help me with this matter.
    @ 90 degree Fahrenheit as soon as turn on the AC, temperature gage climb all the way to red the zone. After turn of the AC, temperature goes back down.
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