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Old 03-23-2001, 08:35 PM
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Join Date: Mar 2001
Location: SF
Posts: 214
Replaced my exhaust manifold yesterday and now the heater is blowing hot air of one temp. It can't be changed, hotter or cooler. A/C has no effect. All the wiring seems to be intact. Coincidence or not? On a second note, for the past 8 months or so, why is it when I briskly accelerate, with the heater on (floor only), does the defroster come on, then return ti floor heat when I decelerate? Sounds like a vaccum glitch.. This system is really confusing!

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Old 03-23-2001, 09:44 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Sounds like you have lost the vacuum to the water valve. The 190 uses a vacuum controlled water valve.

Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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