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1997 SL500
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My 1985 300cd turbo will not stop blowing hot air out of the climate control system. The system is set for fresh air, heat will not shut off. The air does work fine but can't shut the heat off. Could this be the monovalve or something else?
 

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2017 Police Interceptor Utility, 2017 Police Interceptor Sedan
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Aniversary SL - 5/6/2005 7:39 PM

My 1985 300cd turbo will not stop blowing hot air out of the climate control system. The system is set for fresh air, heat will not shut off. The air does work fine but can't shut the heat off. Could this be the monovalve or something else?
Most likely, it is the monovalve. The diaphragm is torn, hot coolant is filling the heater core, hence nonstop heat.
 
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