I have a 88 190e 2.3, I'm having problems with heat comming out of the side vents when the A/Cs on. I've tried closing the two but heat still comes through the defrost vent. I've replaced the heater control valve;still no difference. Can someone help out with a diagram to help me find the leak?

Is the valve closed when you have heat?

Yes, It's Knew

Sounds like a vacuum problem. The heater control valve is vacuum controlled.

I'm guessing, but I bet that when no vacuum is present, the valve defaults to open. Check the vacuum line to the valve for a leak.

Jeff Pierce

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Jeff Pierce

Current Vehicles:
'92 Mercedes 190E/2.3 (247K miles/my daily driver)
'93 Volvo 940 Turbo Wagon (263K miles/a family truckster with spunk)
'99 Kawasaki Concours
Gravely 8120
Previous Vehicles:
'85 Jeep CJ-7 w/ Fisher plow (226K miles)'93 Volvo 940 Turbo Wagon
'53 Willys-Overland Pickup
'85 Honda 750F Interceptor
'93 Nissan Quest
'89 Toyota Camry Wagon
'89 Dodge Raider
'81 Honda CB 750F Super Sport
'88 Toyota Celica
'95 Toyota Tacoma
'74 Honda CB 550F

Cold Center Vents, Hot side 93 190E


See my post in that thread as I am not typing all that stuff again!

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....