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Running Hot


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Tak201
Anonymous Poster
jrstu@bellsouth.net

May 15, 2009, 2:20 AM

Post #1 of 4 (2529 views)
Running Hot Sign In

'88 GMC 1500, 350 V-8, 5 spd, 160,000 mls. When I first crank up, veh. passes running temp but continues to the point of running hot. Stays in the red for a couple of minutes then drops to normal; like the therm is not opening. Has a new radiator and I've gone through 3 thermostats thinking that was the problem.


way2old
Veteran / Moderator
way2old profile image

May 15, 2009, 2:58 AM

Post #2 of 4 (2525 views)
Re: Running Hot Sign In

Have you verified that it is indeed running too hot, or is it just a sending unit or gauge problem?



Being way2old is why I need help from younger minds


Guest
Anonymous Poster

May 15, 2009, 4:12 AM

Post #3 of 4 (2523 views)
Re: Running Hot Sign In

I wondered about a bad sensor. It has never reached the point of "boiling over", but when it gets in the red I can detect the odor of anit-freeze which has led me to believe that it is in fact over heating.


Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

May 15, 2009, 5:20 PM

Post #4 of 4 (2515 views)
Re: Running Hot Sign In

How does the engine temp do when you are driving? Does it run hot, then? This has a temp. controlled clutch fan that will 'freewheel' when cool, but should 'lock up' once engine temp is reached. The symptoms smack of a sticky thermostat, but three? A long shot, but could be an impeller problem, but would be getting hot all of the time, not just in the transfer from cold to warm.
Loren
SW Washington






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