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  #1  
Old 12-23-2014, 08:56 AM
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Join Date: May 2005
Location: Twin Falls, Idaho
Posts: 330
Engine Temp & Climate Control

1983 300SD- 617 engine

Is there an engine temperature sensor that is used by the climate control system?

My heater goes into high speed shortly after the car is started, blowing cold air until the engine warms.

I thought the climate control was supposed to wait until the engine warms before really working hard to warm the cabin.

If there is a sensor for that, where is it? A photo would help.

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1st MBz: 1982 300SD
2nd MBz: 1987 300SDL
3rd MBz: 1995 S420
4th MBz: 1987 190DT
5th MBz: 1984 300SD w/1983 300DT engine
6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles.
and manages Mom's 2007 R320 CDI
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  #2  
Old 12-23-2014, 01:09 PM
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Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,186
Yes, there is a cold engine lock switch. It's located next to the EGR tube. Here is a photo:

http://www.startekinfo.com/StarTek/outside/12253/program/Climate/83-678.pdf

(item #2 on the 2nd page)
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84 300SD 350K+ miles ( Blue Belle )
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  #3  
Old 12-23-2014, 04:43 PM
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Join Date: May 2005
Location: Twin Falls, Idaho
Posts: 330
Quote:
Originally Posted by SD Blue View Post
Yes, there is a cold engine lock switch. It's located next to the EGR tube. Here is a photo:

http://www.startekinfo.com/StarTek/outside/12253/program/Climate/83-678.pdf

(item #2 on the 2nd page)
Thank you!
__________________
.
1st MBz: 1982 300SD
2nd MBz: 1987 300SDL
3rd MBz: 1995 S420
4th MBz: 1987 190DT
5th MBz: 1984 300SD w/1983 300DT engine
6th MBz: 1999 C230k I'm 3rd owner, got it w/57,235 miles.
and manages Mom's 2007 R320 CDI
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  #4  
Old 12-23-2014, 05:52 PM
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Join Date: Apr 2010
Location: West Quebec
Posts: 4,025
The sensor is supposed to ensure that the blower won't kick in before coolant temps reach a predetermined temperature (the unmarked, first white line on the temperature gauge).

However, the defrost setting is separate and the blower will start anytime defrost is selected.

Just FYI.

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2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

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