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#1
12-02-2021, 05:57 PM
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Heat only works for a few minutes
When I turn on the climate control to heat, it’ll only blow warm air for a couple of minutes before it starts getting cooler until it’s fully cold. If I roll the dial down to cold, the back up to hot, it’ll blow warm air for another minute or two before going cold again. Any idea what’s going on?
__________________
Garage: 1983 300TD 1985 300D 1993 190E 2.6 Social: Metric Restoration on Instagram 
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#2
12-02-2021, 10:45 PM
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I'd suspect the mono valve. Monitor the signal to the valve and the hoses for temperature. If the signal stays the same but the hose temp changes its the valve. If the signal changes it is a control e.g., CCU or temp sensor.
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#3
12-05-2021, 05:34 PM
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Solved. Monovalve was getting stuck shut. Tested it with a 12v supply and it would click the first couple times then get stuck. A whack with a hammer on the top would free it up. I disassembled it and cleaned it out.
__________________
Garage: 1983 300TD 1985 300D 1993 190E 2.6 Social: Metric Restoration on Instagram
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#4
12-08-2021, 12:34 AM
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Thanx for the feedback ! .
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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