Re: Cooling system K2500 What's normal?


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Posted by R. Staaterman (67.83.142.238) on 17:50:36 03/01/08

In Reply to: Re: Cooling system K2500 What's normal? posted by Ben

The first picture is where I startoup perhaps a little higher. Then when I stop it jumps up to 195. So I think my variation is more extreme.
This does not feel normal to me. Before the big service (chanigning the pump all the hoses and belt) I never noticed this before.

I installed one of those prestone tee fittings in the heater line to alow me to pressure test the system. I found nothing. Last week the cap on that fitting was a bit loose and I lost a gallon of coolant. That was easy to spot and now it's been fixed but I still seem to be losing some coolant somewhere? No major leakage evident.

So maybe I better use one of those flourescent dyes and see if I can figure out where it's going. The air bubble caused by leakage migjht be the culprit here.

I just passed the vehicle test here in NJ.

Bob S.
: This is normal for my 1996 GMC 7.4L Suburban with a modified 180*F thermostat, Severe Duty fan clutch. Notice that after running on the freeway and then at idle, the temp did go up a bit. These were taken after a Calif Smog test, which it passed with large margins (better than many cars of that year).
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: My 180*F stats have a 3/32" dia hole drilled in the flange. This is in addition to the one that comes with *ALL* thermostats (they usually have a hole smaller than 1/64" dia).
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: Assume the parts person gave you the right one. When they went from V-Belt to Serpentine belt, the pump rotation switched. I don't know HOW2 tell, but maybe someone can post. An arrow on the case would be too much to expect'm to do.
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: Since you tow, suggest you flush every other year with regular ATF. I used to use Mobil synthetic, but no more after burning a fresh charge of it after about 500 miles of very hard towing. So why bother if it will also burn. Maybe a bit longer lasting, but not for me at this point.
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