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  #1  
Old 03-28-2015, 06:53 PM
xaliscomex
 
Join Date: Feb 2006
Location: Ventura County, CA
Posts: 337
w116 300sd 79' temp going up

While driving uphill on my 79 300sd, I have been noticing the temp gage needle moving up. It has been hot lately here in Southern California.

Did not have this problem last year around the same time.

What could be causing the temp gauge needle to move to the line between 80 deg C and 120 deg C. I'm assuming that based on the temp gauge markings that the indicated line is the 100 deg C marking.

Please advise
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  #2  
Old 03-28-2015, 11:42 PM
Registered User
 
Join Date: Jan 2015
Location: Illinois
Posts: 22
When does this occur? When sitting at a stop or moving slowly? Or does it happen all the time?
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  #3  
Old 03-29-2015, 12:13 AM
xaliscomex
 
Join Date: Feb 2006
Location: Ventura County, CA
Posts: 337
Temp gauge needle moves up fast when going uphill. Needle seems to not cool down much when driving in street traffic.

The 212 switch wire is disconnected, could that be the culprit.
Is the 212 switch/wire what kicks on one of the fans?

Last edited by xaliscomex; 03-29-2015 at 01:25 AM.
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  #4  
Old 03-29-2015, 10:16 AM
oldsinner111's Avatar
a parent should die first
 
Join Date: Nov 2008
Location: bristol,tn
Posts: 4,921
probably time for a new radiator,thermo,and flush.
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  #5  
Old 03-29-2015, 10:37 AM
xaliscomex
 
Join Date: Feb 2006
Location: Ventura County, CA
Posts: 337
Note to the Moderator

Meant to start this thread in the Diesel forum
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