On Fri, 3 Aug 2007 13:28:22 -0400, "Stormin Mormon"
Your logic is good but cooling system is suposed to be designed to
deal with this. I have two GM 4x4 that have no heating issues at all
with A/C on even on hottest days. A few things to check here. First
maybe a bad thermostat that is not opening properly. Second, check to
see if radiator is maybe plugged up. Third, check to see it core stack
is plugged up with bugs or dirt reducing airflow and cooling. Last,
verify operation of clutch fan. Typically the bimetal coil that
controls clutch operation ages and when it does it raises engagement
tempature of the clutch fan and the result is that engine runs warm.
The good news is that it is adjustable if you want to take the time to
do it. Unless the seals or bearing go bad in one they do not just wear
out otherwise. In the link below you will findinstructions on haw to
The S-10's were real bad about gumming up the cooling system with the
Dex-cool coolant. Remove the radiator cap and see if the thing isn't
full of brown crud. Coolant level could just be low, too.
Old Crow "Yol Bolsun!"
'82 FLTC-P "Miss Pearl"
'95 YJ Rio Grande
BS#133, SENS, TOMKAT, MAMBM
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