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
#338 of 371 Re: 2000 GMC Safari Heater A/C problem [jim481]
Sep 30, 2011 (3:54 pm)
Hope you fixed it but if you didn't.... The problem may be in two places. The first and easiet is the manifold located on the left side facing the engine. It is located to the right of the black box. One line goes through the firewall, one goes down, and one goes across the top of the engine. In my case, mine was badly worn on the down part and the one going across the engine. There should be no problem fixing the one next to the black box. The other one is an issue if you don't know where it is. There are two ways to get to it.
If you know how to remove the engine cover, you'll have better access to the manifold. The manifold is right on top of the valve cover. If it is broken off, it's a little tough to see it. Just keep looking for a black vaccume that has one hose coming from the valve cover about 1/2" into the unit. The other side has the fitting. Be very careful taking off the hose, you don't want to break off that fitting. I took the fitting off and cleaned out the broken part. I then used a small piece of hard tubbing and joined it with the tubing I bought at the auto store. I bought about 6" more then I needed so I could move the line away from the heat.
The other way. If you can reach the air cleaner screw, remove the air cleaner assembly. Look for the aluminum tube running in front of the vlave cover. Right behind that you'll see the vaccume. The line has a right angle on it. If you can pop off the vaccume line, you will be able to repair the line. I used a section of the hard vaccume line as a coupler. it worked just fine. I hope this helps. I know I had a difficult time becuse I did not know where the vaccume was located. Once I found it, It took about 10 minutes to fix it. The car is blowing through all vents in all settings.
One other note. I did have to change out the resistor located in the blower housing. The number one plug was burned up. I figured the vaccume line failed which caused the resistor to overheat. That was a $65 part. Not to difficult to change and located behind the wiper and coolent tanks. Just pry the plastic plugs up from the top. You'll see a small groove. The black plug comes all the way out and just lift out the tanks after making a few disconnections. Remove the two screws holding the hoses, then the two screws holding the resistor. You just have to disconnect the wire on the left. It resistor will comes right out after taking off the two screws.
#339 of 371 97 Safari rear heater blowing cold air
Nov 19, 2011 (5:25 pm)
I've searched all the threads..seen some reference to rear heater not blowing hot....but found no solutions.
Rear heater and AC blowers\speeds work fine, heater does not blow hot and AC does not blow cold. Front heat is all good on speeds and functions, etc.
Any suggestions on how to troubleshoot and fix rear heat problem would be appreciated.
#340 of 371 Re: Vacuum hose [vp79]
Dec 04, 2011 (3:59 pm)
Hey did you ever figure out the vacuum line and were it goes. I have the exact same problem and I can't find were it goes to save my life. I had the inside engine cover off, the air intake off and the throttle body cover off, still can't find were it plugs into. The hard plastic vacumm lines that go from the A/C and over to the valve cover are all fine. It's that same soft rubber hose that was just dangling there and dry rotted as dry rotted can be. it's about 14 inches long. I've been to a hundred web sites and they all refer to the hard plastic lines...gahh it's frustrating as I'm a pretty good back yard mechanic
#341 of 371 Chevy Astro Van climate control heater
Dec 12, 2011 (4:39 pm)
I have a 96 chevy astro van that has a climate control without a/c. The interior knob broke off
so I went and got a replacement controller, but it also has an a/c turn on it. I got it installed but
it is not working. Do I have to get a climate control without the ac attachment or should it still work. Any advice would be great. Going to take apart and give it another shot. Thanks
#342 of 371 97 Safari - blower works - no hot air
Jan 05, 2012 (1:10 pm)
I posted a query back in November about the rear heater blowing air fine on all speeds, but the air is cold. I flushed the rear heater core, but still just cold air. Would there be a vacuum-controlled valve that regulates the ratio of hot coolant to the rear core somewhere?? Any info or ideas would be greatly appreciated.
#343 of 371 Re: 97 Safari - blower works - no hot air [morkman]
Jan 09, 2012 (1:16 pm)
Well, I managed a temporary fix for my own problem and thought I would share it, in case others have the same problem. Just to the right of the black heater box , below the silver AC condenser/drier you will find a solenoid with upper and lower 5/32 vacuum hoses. The upper one comes from the firewall, the lower one goes to the valve that controls hot coolant to the rear heater core. Apparently the solenoid stuck closed last summer due to lack of use.
So I disconnected the two hoses and connected them directly with a 90 degree 5/32 connector. I now have hot coolant going to the rear heater core all the time which can be regulated with the rear heater fan switch. Van is a 97 GMC Safari AWD, but I believe this would work for all model years.
Feb 10, 2012 (4:07 pm)
Can anyone tell me how to get to the heater core on a 2000 astro van, please. I have a coolant leak under the passenger dashboard and that seems the logical problem.
#345 of 371 Re: Heater core [2000dcastro]
Feb 14, 2012 (8:48 am)
I have a 91 Safari, and it's just a matter of a few screws to take out on the plastic dashing on the passenger side.. should be pretty simle to get to.
#346 of 371 Re: 1999 GMC Safari heat blows luke warm or cool [geraldl]
Feb 14, 2012 (8:51 am)
Did you ever get this figured out? I have the exact same problem in my 91' Safari?
#347 of 371 Only cool air in my 91' Safari
Feb 14, 2012 (8:55 am)
Replaced the thermostat, bypassed the stupid heater control valve with Stainless steal tubing and flushed the heater core with water while I had the HCV off. Still only luke warm air.. what else could it be?