That vacuum line originates at a T fitting at the vacuum reservior (about a 5" black ball) located near the right front inner fender, about 2" forward and right of the engine block. A larger tube supplies the vacuum from the right rear of the upper intake manifold (plenum) fitting. This tiny plastic tube is prone to drying and splitting in the area that is exposed to engine bay heat before it goes into the wiring harness loom, so give it a good look over there. Also, the manual valve in the controls gets loose from use and will loose vac there, I've made special and cheap kits to repair this. On my '95 Astro I had only 5" of vacuum at the fitting on the plenum, a new gasket brought it back.
Most all of the vacuum lines will start from the intake manifold in the rear..........
It's either the thermostat or the heater controls.
lose of vacuum to heater deverter valve.follow heater hoses from engine to heater core valve has two hoses in and two hoses out and one vacuum hose.vacuum hose gose to tee then back to engine other vacuum from tee controls heater switch defrost to floor heat knob. replace all of these lines about 6 feet will do it.now the bad, you must pull back the dog house about a foot divers side to remove one vacuum hose just do it the first time and both problems should go away.
heater sensor circuit Chevy astro 2000
can I get a diagram to replace vacuum hoses ona 986 chevy astro van
vacume line to the valve has broke off from manifold vac that goes to the switch
How do you change a heater core in 1994 chevy astro van?
Check for a vacuum leak or broken vacuum line first and if all is correct then you will need to check the a/c - heater controller..........
The heater resistor on a 94 Astro is located on the top of the heater box under the hood, it has a four or five wire plug on it and two 6mm screws hold it in a hole in the heater blower box.
The heater control valve is mounted on the engine side of the heater and evaporator box which is located on the passenger side of the engine compartment. It will have at least three hoses connected to it and one vacuum line. It kind of hides underneath the a/c accumulator.
which line are we talking about the small hard plastic line that is near the A/C freon resavour to the valve cover on the drivers side. If that's the one you'll have to take off the engine cover on the inside and it is located next to the throttle body on the drivers side. There is another soft rubber hose that comes off of that same connector near the A/C unit that goes somewere behind the alternator. I haven't found it yet been looking and searching for hours now
You can find the block heater cord behind the grill of your 2001 Chevy Astro. The cord will be on the drivers side of the grill.
Drain the water from your 1998 Chevy Astro cooling system. Remove the water supply hoses from the heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
how to remove heater core 87 Chevy astro van. like to have diagram.
Check for a vacuum leak either under the hood or under the dash Check the operation of the vacuum actuated motors under the dash Check the operation of the selector switch Defrost is the default position for this system
If that made sense i'd answer it
To change the heater blower motor on a 2000 Chevrolet Astro Van open your hood. After you open the hood you will see the heater box on he passenger side remove the four bolts holding the motor in and pull it out.
On the passenger side in the black box
I have a 1996 Astro van and I'm having trouble too. My fan motor sticks. It has for a while. Its not the heater but the fan that has draged. I can get out and pound on the casing, and sometimes it starts up.
get a new heater switch
I had the same problem with my '97 Astro van, the plastic vacuum line from the PCV valve to the vacuum cannister underneath the front end had broken. It might not be that vacuum line, but you do have a vacuum leak somewhere.
what do you need to know, I have an 89