Last post on Oct 13, 2013 at 2:35 PM
You are in the GMC Safari & Chevy Astro
What is this discussion about?
GMC Safari, Chevrolet Astro, GMC Safari Cargo, Heating / Cooling, Van
#110 of 371 Re: 1999 Astro No Heat at Lower Vents [cob]
Feb 13, 2007 (7:21 am)
You people are aright!
My 2001 GMC Safari also had no heat from some outlets.Sometimes they would finally open up.You told me where to look for that tiny plastic vacuum line by the AC unit and where to look on the intake manifold. Sure enough the line was brittle and leaking by the engine.Nappa Auto sells 3' lengths of the plastic tubing(1/8")and the old fittings just pull out.I did cover the engine end of the tubing with larger rubber tubing too.and routed it over top by the air cleaner.
Hardest part was getting the doghouse off.
Total repair cost $4.00
#111 of 371 1997 Astro heat problems. Please help!
Feb 18, 2007 (10:07 pm)
I bought my 97 Astro new and now am having trouble with heating. I sometimes have cold air coming out of the front vents, sometimes luke warm. I have heat coming out the factory rear. Sometimes this changes, and I get cold air out of the rear and luke warm air out of the front. My selector directs the air flow to defrost, bilevel or floor fine. My antifreeze is full. I have no leaks. I replaced all of the 5/32 vacuum lines from the ball under the antifreeze res. and to and from the control valve. I have read all of the threads prior to mine and am wondering if anyone has had to replace the heater control valve behind the silver air conditioner tank on the pass. side under the hood. Mine has two vacuum line attached with an electrical solinoid on top and heater hoses on the bottom ports. Also, what is the function of the 1/8" black vacuum line which goes across the top of the motor. It looked like it was ok but didn't take off the dog house to inspect the whole line. I know that my thermostat needs changing because it only gets to about 150 degrees. But, would this cause my eratic heating in front and back? Seems like it could be the heater control valve to me but not sure. Thanks to whomever can help!
#112 of 371 Re: 1997 Astro heat problems. Please help! [slushpup]
Feb 19, 2007 (9:46 am)
First, replace the thermostat, takes 10 minutes no gasket no permatex the thermostat has a rubber gasket around it simple fix. That maybe all it takes to get the heater to work, start with the simple fix. The 1/8" line is the one that usually fails. It is the line that goes to the vacuum port on the intake manifold and creates the vacuum for the system. When it breaks your heater defaults to the defrost setting and based on your post you have no problem with that at this time.
#113 of 371 Re: 1997 Astro heat problems. Please help! [cob]
Feb 19, 2007 (9:37 pm)
Cob, sounds like good advice. I already have the thermostat and gasket so I'll replace it. Do I need to drain all of the antifreeze out of the radiator? I can't find a petcock on the lower radiator to drain the antifreeze. Do you unhook the lower radiator hose to drain it? Or do you just pull the hose from the thermostat housing and loose what is in the upper hose? Thanks again.
#114 of 371 Re: 1997 Astro heat problems. Please help! [slushpup]
Feb 20, 2007 (9:33 am)
If the van is cold than the fluid in the upper hose will mostly be drained down. There is no petcock so just remove the upper hose and when you remove the goose neck you will lose maybe a quart at most of fluid after all this is the highest point in the cooling system and when it is not under pressure it should drain down to the lower level.
#115 of 371 Re: 1997 Astro heat problems. Thanks Mr. Cob
Feb 20, 2007 (7:05 pm)
Thankyou Mr.Cob, I will change the thermostat tomorrow.
#116 of 371 Re: probably a vaccum hose [tkw]
Feb 25, 2007 (5:38 pm)
My experience in repairing my 98 Astro vacuum hose problem was almost identical to tkw! Including holding the rubber fitting between my left index finger and middle finger and feeling stuck there. After some patient twisting and pulling, I was successful in pulling the fitting from the manifold end. The vacuum hose was extremely brittle and broke into pieces very easily. Project completed all from under the hood!
My creative fix was to remove the small original tubing from the rubber fittings at each end and used 1/8" drip irrigation tubing (which I had plenty of) to push into each rubber end fitting, re-route over the air filter away from extreme heat and...success. Thanks for all the helpful 'posts'!
#117 of 371 will solution count for 1992 model Astro too?
May 14, 2007 (2:00 am)
Will solution to vacuum hose problems described on here count for 1992 models as well?.
My problem started with slow reaction on the vent lever, shifting it from position to position. This lasted for a couple of months, now it will not shift from AC to one of the upper positions (vent, blend, window) at all.
On my car there are two hoses, not one. One black and one white that runs as described in previous postings over to the driver's side where it seems to go through the wall together with all the electrical wires into the cabin under the dashboard. They are both plenty long enough for alternate routings, and they are not even close to any hot parts that could make them melt.
Opening the HVAC console (two screws), engine not running, and moving the lever, I could clearly hear the sound of vacuum shifting positions. The two vacuum hoses leading in to the console are one green and one black. They both seems to be OK. I disconnected them, and could clearly hear the suction, and feel it as well, closing the tube ends with my finger.
#118 of 371 1995 Safari Blower problem
May 28, 2007 (9:20 am)
I have a 1995 Safari and the blower doesn't run. I replaced the switch, but that didn't work. Then I replaced the fuse and it worked for awhile, but now it has stopped blowing air again. Could it be the blower motor or possibly an electrical short?
Any suggestions would be greatly appreciated.
May 30, 2007 (5:42 pm)
well i got to say thank you to everyone i read most of this forum for my ac problem on my 2000 astro air blowing out of the defrost and ac/heat not working in the back . i replaced all 3 hose's like you all said and now it works great except the ac that is not cold . it is full of the freon but not cold can some one help thanks you this is a great help site .printman1691