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Old 09-30-2002, 03:39 PM
sunil190e-1.8's Avatar
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Join Date: Jun 2002
Location: uk
Posts: 236
merc 230e-1987-w124-heater problem

the car has developed a problem with interior heating.
even with the heater control valve set at minimum,hot air comes thru the ducts.

what is the cause of this? any ideas on a solution.

may the experienced techs can respond to this,or pont in in the right direction..

thanks .
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Old 10-01-2002, 02:32 PM
Registered User
Join Date: Apr 2002
Location: Surrey, Uk
Posts: 254
The heating is controlled by the 2 solenoid operated valves just in front of the brake master cylinder (RHD UK car right?). These close when energised (under the control of the electronics behind the temperature dials) and spring open when current is cut. So you are looking for either failure of the control module or power failure which is failing to close the valves. Check fuse F7 (also supplies the revering lights) and the wiring around the valves.
Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)
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