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Old 11-23-2005, 04:44 PM
Registered User
Join Date: Nov 2005
Posts: 1
I need help

how do i get heat in a 1988 sel mercedes 650?

I just got the car not too long ago and cannot seem to get heat. I have changed the thermostat thinking that was the problem but its not. I can only get cold air....please help.....

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Old 11-23-2005, 04:53 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 12,569
Do a search on monovalve. Sounds like you may need to replace it.
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Old 11-23-2005, 05:00 PM
Registered User
Join Date: Sep 2003
Location: France
Posts: 487
Touch the hoses on the monovalves, ie before from engine and after to the heating radiator , if that one before is warm (be carfull temperature can reach 85°c) and the other not, there is the problem.
if there is an auxillairy pump you should ear the sound and feel pressure schocks on the hose.

Good luck

Keep us posted especially if your problem is solved
Present cars:
My car: E-class 420CDI, 2008, W211, V8,[/B] 50 000km

Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 245000km

Son's one: GLK class 220CDI, 2009, W204

Sold E class 260E, W124, 1988 beloved car sold after 489 000 kilometres of reliable services (engine M103, clutch and 5 speed manual gear box all original).
E-class, W210 320CDI, 2000[/B], 225 000km, Sold
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