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Old 05-24-2005, 08:07 AM
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Join Date: May 2004
Location: Reading-England
Posts: 116
W124 Cabin heat...its getting hot in here!

Ok, I know that this problem has probably been covered many a time, but I can't quite get to the bottom of the problem on my car, so I would be grateful if somebody could give me a step by step run down on likely problems.

First the car...its a 1986 W124 300E with NO Air-con.

Problem: No matter how much turning of the heater dials I do, the air ducts continue to blast out hot air......how do I get this fixed?

I've heard it could be the duovalves....I assume these are the two silver Bosch domes that sit infront of the brake servo. I've read that giving them a whack can unstick the solenoids...is this correct.

How else do I check to see if they are working and how easy are they to replace.

I've also read that the printed circuit board on the rear of the heater dials can fail....is this true and does it apply to non air-con cars? If so how do you get the wood trim off.

Any other suggestions.....please help before I disappear into a puddle of sweat
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Current Mercs
R129 1994 300-24SL
W124 320E Turbo Technics Twin Turbo 350bhp

Previous Mercs
W124 1986 Quad Cam AMG Hammer, 45,000 miles
W124 300E Turbo Technics Twin Turbo 320bhp
W124 E500
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