Thread: HVAC only putting out heat, even when off
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Old 07-10-2020, 05:24 PM
5cylinder 5cylinder is offline
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Posts: 320
Quote:
Originally Posted by Diseasel300 View Post
Start by diagnosing if you have 12V being applied to the monovalve. Make sure it is connected to the coil when you're testing (it's a transistorized circuit). If you do not have 12V being applied, you have a pushbutton unit problem. If you do have 12V being applied, you have a bad monovalve cartridge or a bad coil. The coil can be tested for resistance, it should be somewhere around 14-15Ω if good.
This sounds like a diagnosis that would also apply to a 1980-something to 1985 300 series W123.
Correct or no?

Thanks-
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