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You need to get a hotter stat for winter....plus you need to reduce air flow into radiator. You can reduce flow by installing a piece of cardboard in front of radiator. Please only cover partially as complete coverage coyld cause overheating. You are only teying to reduce not elim
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make sure the radiator cooling fans are coming on. GM has also had major problems with the lower intake gaskets leaking on the V-6 engines. sometimes when refilling the cooling systems air lock can occur. run the engine until it warms up and then turn off and let it cool down, if coolant level goes down repeat this process two or three times. other causes could be clogged radiator, or worse case scenario blown head gaskets. also i have on occasion got bad thermostats from the parts store. the upper radiator hose will get very hot when the thermostat opens. run the engine and hold the upper hose and when the t-stat opens the hose will get hot. then when the cooling fan comes on hot air will rush from from the fans. if the fans come on and the air is cool then there is a circulation problem. t-stat, clogged radiator, low coolant, head gaskets. good luck.
1. Try a new radiator reservoir cap (trust me, it is very important in holding pressure which keeps the coolant from boiling out).
2. This one you will need an entire weekend to spend on this. You need to remove the thermostat and replace the thermostat housing. pull one of the radiator hoses and attach a garden hose with good pressure. It needs to flush for at least 20 minutes. Then switch directions and flush water where was coming out. Then put it back together and drive until it gets hot. Allow it to cool for 45mins (to prevent engine from cracking due to rapid cooling) and repeat until no crud comes out when flushing.
Drain and flush the cooling system...more than once if needed. Replace the thermostat with a 180 degree...the OE stat. is 200 degree. Clean the outside of the radiator and a/c condensor, make sure there is no debris in the cooling fins and they flow air freely. Fill system with 50/50 mixture. If it still attempts to overheat...check your cat convertor, it's clogged and creating too much back-pressure Hope this helps...
its fairly easy (don't do this while hot) temp is around 180-200* you want to place a bucket or drain pan under the the front where the drain chock is located open so that you drain about 1-1.5 gal's out of the radiator (it would be good to have some cat litter handy and clean up right away so that shoud you have a dog his/she is not poisened follow the top radiator hose to the thermostat and remove the 2 bolts on each side "if lucky you have the rubber gasket to seal the housing back up. replace the thermo with new unit (some aftermarket parts companys give you a cheeze rubber gasket its best to reuse the old rubber gasket in this case) locate temp sensor unscrew after disconecting wire reconect wire after installing sensor refill antifreeze with fresh 50/50 mix start car or van let run with presser cap off so that the system can bleed out the air out of the system then top off coolent after engine has reached operating tempature continue checking with cap off. turn hearter control to max hot add fluid to overflow tank replace cap to the hot mark drive couple times around the block and check tank let car/van sit for a few minute's to cool down check tank should read full or needs fluid add as needed check for leakswhen done clean drive
Waterpump? The blades can erode away from age and old antifreeze. Or not enough airflow thru the radiator. Try blowing through the fins with an airhose to see if it is dirty or plugged.
drain anti freeze follow upper radiator to the t-stat housing take off hose then 2 -13mm. bolts pull off housing there will be the t-stat pull out then clean housing put in new t-stat and gasket.then hose fill up slowly with antifreeze let run at 2000 rpms for 3 minutes with heater on hot air once you get heat your done.please rate this answer thanks.
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