Water pumps, radiators, fan clutches, thermostats and expansion tanks to General Motors original specification for Chevrolet, GMC, Cadillac, Buick and Hummer.
Cooling is the system where a cheap substitution costs the most. A thermostat that opens a few degrees early keeps the engine below its designed operating temperature, which the engine control module compensates for with a richer mixture, higher fuel consumption and accelerated bore wear. A water pump with a different impeller vane count moves a different volume at the same engine speed. We supply cooling components to the original GM specification, including the correct thermostat opening temperature and fan clutch engagement point for the platform.
Coolant leaves the block, is driven by the pump, passes the thermostat once it reaches its rated opening temperature, sheds heat in the radiator with fan assistance, and returns to the block.
Always replace the thermostat with the original opening temperature. Fitting a cooler-rated thermostat to cure an overheat masks the real fault and pushes the engine out of its closed-loop fuelling target permanently.
We supply Cooling System components across every General Motors division:
On engines where the pump is driven by the timing chain or belt, yes. The labour to reach it is nearly all of the job, and a pump that fails a year later means paying that labour twice.
Sustained high load exposes marginal capacity that is invisible in normal driving. The usual causes are a fan clutch that no longer locks up, a radiator core partially blocked internally, or a thermostat that opens fully but late.
Send the VIN and a description. We will identify the correct OE part and quote it back to you.
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