Quote:
Originally Posted by pickupman42
My 2000 silverado heater does not work to well It does not get very hot. The thermostat is opening and the heater core is not leaking. Any ideas???
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the heater core needs to be cleaned/flushed out in most cases. if the hoses are not hot to from the heater core this is what is wrong.
remove the hoses at the engine then using a water hose slowly crank up the pressure to flush out the core in both directions...
If you somehow mixed dexcool with another coolant that does not state as meeting the GM spec. you may need to drain the entire coolant system if you find black goo causing you problems..
the 5.3L engine coolant system has a total capacity of 4.5gallons..
so if you just drain the radiator about 2 gallons remains inside the engine.