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Another Automotive Question
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Pitch    Posted 12-12-2004 at 19:03:00       [Reply]  [No Email]
'89 Chevy 1/2 ton, 90,000 miles 2wd, auto 305V8.
Ok It runs great but the temp guage will start to rise goes all the way up and then drops to normal 165 it will then rise again and drop and will continue doing this after 20 minutes or so of driving will level out right where it is supposed to be untill I hit a hill and then back up again. I thought the thermostat might be sticking but have changed it twice. In warm weather it will only cycle like this a couple of time but below 40 it keeps it up. Truck runs normally does not seem to be hot. MY guesses Bad sending unit or bad head gasket altho it does not lose coolant. Any other guesses?

Steve from TN    Posted 12-13-2004 at 05:40:08       [Reply]  [No Email]
Pitch, sometimes a radiator hose collapses with age. I don't know if it can cycle like you are talking about though.

Clod    Posted 12-12-2004 at 19:49:12       [Reply]  [No Email]
Yes,,Guesses a plenty. there are things involved with polution controls that can add heat.EGR valve if you have it.Some develope a vacumm leak U test by spraying carb cleaner on there as the engine hear a speed change ,you have a vac leak. But also computers can do things to cause this.Another is dependence on factory guages. Well ,fan clutch is another. There are 2 springs on front that you can release to lock the fan so the clutch is not slipping.<<<<<<<<<< Those were guesses.Bob Ont and Toolman might have other ideas . IF they arrive.

sammy the RED    Posted 12-12-2004 at 19:46:29       [Reply]  [No Email]
Water pump.
My '81 Bowtie did same thing.

Willy-N    Posted 12-12-2004 at 19:44:21       [Reply]  [No Email]
Junk in the cooling system? I had some fuss from a mouse nest in the radator that caused that to happen to me in my M37 and flushed out the block and radiator real good solved the problem. The fuss was pluging the thermostat but when I shut it off it went back in the head. I saw it once and then flushed it out. Of course my radiator was un/hooked from the hose for a while and a mouse thought it would make a good home for it and I had not washed it all out befor hooking it all up. Mark H.

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