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


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