can not turn the heat off - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 09-15-2009, 03:06 PM Thread Starter
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Date registered: Sep 2009
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can not turn the heat off

1988 560sl I cannot turn the heat off, the air conditioning is working fine, the fan will respond to setpoint changes, but all we get is extremely hot air in the cabin, if I pinch off the heater hose the car will cool down rapidly. is this the duo valve or monovalve not operating properly? What else can it be. Which item in the corner by the firewall is the valve? Thanks for any help that is offered
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