Question about 2000 GMC New Sierra 1500

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My 2000 sierra seems to run hot. it is running about

My 2000sierra seems to run hot. it is running about 210 normally and when hauling the boat gets up to around 240. could it be a thermostat or is something else wrong?

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Replacing the thermostat is the easiest and least expensive way to find out if that is indeed the problem. operating your truck at higher than normal temp will cause premature wear and possibly failure of vital engine parts
if the truck is running at normal operating temp with no load and above normal with a heavy load, it's possible the radiator has exessive mineral build up and the flow is restricted somewhat. what i can suggest is, remove any debris from the radiator and a/c condensor fins. hose down the fins flush the coolant system. use a good radiator flush additive as per instructions. prestone is a trusted brand. back flushing is a good method for cleaning the cooling system. a back flushing tee is available at parts stores and gives specific instructions for installation and procedure. it's quite easy and inexpensive. inspect the radiator for deposits by removing the cap and looking in the radiator, you might see white deposits on the ends of the tubes. replacing the radiator might be an option if it is determined deposits are excessive and flow is restricted. add coolant in the proper mix ratio to afford the highest leval of protection. using synthetic motor oil will also help lower the temp. if the problem persists, you can install an aftermarket electric cooling fan on the front of the radiator. make sure radiator hoses are in good shape. if they feel weak, replace them.

Posted on May 29, 2010

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WHEN YOU HAUL OR PULL HEAVY LOADS. IT WILL PUT STRAIN ON TRANSMISSION AND ENGINE CAUSING ENGINE TO OVERHEAT.

Posted on May 29, 2010

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