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  #1  
Old 11-21-2005, 11:40 AM
rscott77x
 
Join Date: Nov 2005
Posts: 4
Exclamation 81 300SD low engine temp problems

My temp gauge rarely moves very much. It started a few months ago and got progressively worse. I repaced the sensor on the block (I bought a new one years ago and decided to put it in). No change. I have ordered a thermostat. Question, if the thermostat fails, does it default in the always open position? If so, that would explain the behavior. My trips are fairly short now. But, as I recall, an interstate drive did cause the gauge to move to normal range. What is the best way to get rid of airlocks when I change the coolant and thermostat? Thanks

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  #2  
Old 11-21-2005, 11:42 AM
Registered User
 
Join Date: Dec 2002
Location: RI shore
Posts: 2,937
Quote:
Originally Posted by rscott77x
My temp gauge rarely moves very much. It started a few months ago and got progressively worse. I repaced the sensor on the block (I bought a new one years ago and decided to put it in). No change. I have ordered a thermostat. Question, if the thermostat fails, does it default in the always open position? YESIf so, that would explain the behavior. My trips are fairly short now. But, as I recall, an interstate drive did cause the gauge to move to normal range. What is the best way to get rid of airlocks when I change the coolant and thermostat? Thanks
that's it
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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

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  #3  
Old 11-21-2005, 01:20 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 38,613
start it up

and run til the stat opens. shut it off and check water level. do it twice more.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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