I have a 1997 Jimmy 4x4 4.3 truck, in hot weather excessive heat under the hood and shuts the truck down.Temp gauge reads normal opperating temp. Especially if you turn on the ac. Will start and run after it cools down. New catalytic converter, o2 sensors are fine, new thermostat. Only does this on hot days.
Jerry Mcdonald
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There is a blower control resistor (manual system) or a blower transistor (automatic temp system) located behind the glove compartment in the HVAC box and this is a high failure item.
i had something similar once, it ended up being the intake radiator hose, it has a metal coil inside, mine was broken and when you revved the motor it would **** the hose shut and overheat, but under 2000 rpm it was fine .
try skewing the engine coolant temperature sensor with a multi-meter and a temp vs resistance or voltage chart. the ect could be out of range and not set a code. also check actual engine temp with an infrared thermometer. hope this helps
I am guessing that the gauge is showing normal operating temp, if so, I am also guessing that the blower motor is pushing air through the ducts.... if so than
were heater hoses reconnected ?
was hot water valve vacuum line reconnected ?
was all air purged from entire cooling system after engine repplaced ?
were heater hoses connected properly to get correct direction of flow ?
are hoses to heater core under hood getting hot ?
Make sure you're using proper amount of coolant in the water. You could have dirty fins or something blocking the front of the rad preventing it from cooling enough or might be rad clogging up. If gauge goes over half way then I'd worry. I'd remove rad and use rad cleaner or get it cleaned professionally.
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