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Discard the valve all together and plug the vacuum line as if there was no bypass valve

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โˆ™ 2015-07-15 19:57:32
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Q: How do you check out the heater bypass valve with a vacuum gauge in an 89 Plymouth Acclaim 2.5L?
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Why is there no heat in my 1989 Plymouth Acclaim?

Low coolant? Bad thermostat? Heater core plugged, restricted, or airbound? ============================================================== Good answers by original poster. I would recommend replacing the t-stat first. Its pretty straightforward. If that doesnt solve your problem, our 89 acclaim's have a heater valve (it shuts off coolant flow to the heater core when the a/c is activated to increase the efficiency of the a/c) by the firewall that can stick or lose vacuum (broken vacuum line). Check that next. Lastly, I would take the lines off the heater core and run a garden hose up to it. This will "backflush" any accumulated crud out of the heater core. I do this to my Acclaim every fall and cant believe the crap that comes out! ============================================================== When the heater went out in my car, I went in and found out that it was the heater control valve. Check it out.

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Where can you find a diagram to show the routing of vacuum lines on a 1991 Plymouth Acclaim?

You can find a manual at oriellys called Chilton Chrysler front wheel drive cars 4-cyl !981-95 repair manual

Where is the heater control valve on a 1999 dodge durango?

There is no heater control valve on this generation of dodges like there used to be... the water flows constantly through the heater valve.. the only control is a trap door that allows cab air to be run through the heater core and is controlled by a vacuum solenoid in the heater box.. the temp control is also vacuum operated but be sure to check the vacuum supply line coming in from the engine.... it has a check valve in it that can be keeping the controls from getting enough vacuum to operate properly.. if you don't have a mighty vac just get one of those packs of barbed vacuum fittings from your local shucks and bypass the valve temporarily and see if you get heat... hope this helps

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It is not adjustable. It is computer controlled. If idle speed is incorrect you have a vacuum leak or a sensor/solenoid issue.It is not adjustable. It is computer controlled. If idle speed is incorrect you have a vacuum leak or a sensor/solenoid issue.

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You can find a vacuum line diagram for a 1993 Plymouth Voyager in the owner's manual. You can also find it at various auto stores.

What does the heater valve do?

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You did some work on the radiator bypass for your 2000 Ford Windstar 38L and now the vents inside the cabin won't change from defrost Is there a schematic showing you where you can look for the proble?

I am not sure what you mean by the radiator bypass. But it sounds like you have a loss of vacuum to your AC/heater control. When you have no vacuum to the control, it defaults to defrost. There is only one vacuum supply entering the passenger compartment through a black hose under the hood on the passengers side close to the AC lines where they go through the dash. There is also a vacuum canister right there. See if you have knocked a vacuum hose off right there.

Heater control does not work on 1991 Plymouth voyger. fan operates normally. control stays on defrost only will not switch to any other function?

can happen when vacuum line is disconnected . look under hood to right of heater hoses. one vacuum line goes to heater valve (gate)on heater hose ,the other should go past this to a small sized metal object the size of a small lemon. if this is disconnected only defrost will work. I HOPE YOUR 91 IS SIMILAR TO MY 93.

Where is the vacuum line for the heater blend door on a 2000 Chevy blazer s- 10?

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The airflow direction for my heater on a 1999 Chevy Malibu is not working properly. It doesn't direct where you want it to. Help?

if im not mistaken the heater control has vacuum lines. take off heater controls and see if you have a bad vacuum line to heater box.

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Why would the blower of a 1990 Lincoln Town Car switch from the heater to the vent to defrost when accelerating or decelerating?

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Most all of the vacuum lines will start from the intake manifold in the rear..........

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Your dodge heater blower changes when you accelerate?

Start out by checking for a vacuum leak both inside and outside for the a/c and heater.........

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You can find heater vacuum line diagrams for your Chevy van in most Chevrolet service manuals. The service manuals can be found at your local library.

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Where is the vacuum pump for the heater located in a 1995 Ford F-250 Diesel? Ihave already changed the thermostat and the antifreeze, checked the heater switch and still no heat! Help

What would cause a car heater to not get hot?

low water, bad thermostat, vacuum door not working, clogged up heater core, heater valve broken........

What does a code 13 mean on a 1991 Plymouth Voyager?

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