My 2003 Astro has no heat coming out although the knob is set to highest position. It was working last winter but I suspect a valve is stuck, any ideas?
I finally tapped on the heater control valve and the diaphram opened..I now have heat again..trying to get underneath to hit linkage with WD40I finally tapped on the heater control valve and the diaphram opened..I now have heat again..trying to get underneath to hit linkage with WD40
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this may be coming from an axle"{ wind up" situation occurring when the diff between the front and rear diffs is not working properly. If you have traction control I would suspect a faulty sensor. Have the fault codes read to make sure
The sliding switch on the console is stuck in the cold position and the knob is pulled off. Use pliers to jiggle the switch as best you can. Feel under the center console and you probably will find the cable that is hooked up to the flapper. You'll know because when you jiggle the cold/heater switch at the upper console, the cable will move slightly. At the hookup of the cable to the flapper down under the console (passenger side) try to work the flapper loose to the open (or close) position. At the same time work the sliding switch (with pliers). The flapper will come loose and function properly. Try not to knock of the AC button like I did in the process. It flew off some where under the passenger seat. I'll find it sometime before summer. Ha.
turn the heat knob all the way to hot (highest) setting and when it starts blowing heat you can turn it down to a comfortable temperature
At least that's how mine works
You could be low on Coolant, or you might need a new thermostat, if yours is stuck shut then it won't allow any coolant to flow which means no warm air. Lastly, if your heater controll valve isn't opening then no hot coolant is able to pass through your heater core and you won't get any heat. This valve can be cable operated or electrically operated.
Not exactly sure if it's an easy fix without looking at it , but is seem to be the switch is going out, usually have to take dash trim off to expose the bolts to get the switch housing out. Then the switch will come off from the back side , and you'll have to unplug the wireing plug from it, to replace it.
There is a thin vacuum hose running across the top of the engine from the front left side to the rear. this connects to the back of your a/c position switch. Over time it becomes brittle and cracks therefore leaving your vents stuck in it's last positon. Cut out the bad section and purchase about 3 feet of rubber hose at the auto store. Take a piece of the bad section with you to see which size hose will fit onto it. Slip it over the cut ends and pass it thru the space where the windshild washer fluid hose is attached to the back wall. This will keep it up and away from the heat. I had this problem on a 1997, 1999 and 2002 Astro and fixed the problem for less that $3.
John
I finally tapped on the heater control valve and the diaphram opened..I now have heat again..trying to get underneath to hit linkage with WD40
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