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Its your heater valve, its not closing therefore its letting coolant go Thur the heater core. Good news cheap fix,1 hour of labor and 20 bucks for the part. If your going to do it s easy located between the 2 firewalls ,!st remove mesh , 2nd windshield wiper then wiper motor ,3rd blower motor casing then motor. You'll see the valve. sound like alot of work but its not. The only thing that's not simply skews and bolts is the blower mount there clips.

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Q: 92 Mercedes 190E Heater blows hot all the time help?
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