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I have a 1999 cadillac deville i bought a new water pump new t-stat and it still over heast it goes up slowly.it takes about 20 to 25 min to get up to 230 .i took out the t-stat so the water can always flow trough but thats not the problem the water flows just fine its just the water gets hot.
Re: I have a 1999 cadillac deville i bought a new water...
The radiator cap may not be holding enough pressure. Also, don't drive without the thermostat. It will mess up the closed-loop operation of the fuel injection system. That trick worked 40 years ago.
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either the bearing in the water pump froze up, or the bearing in the tensioner froze, this can also cause the serpentine belt to be thrown off of the pulleys.
The thermostat in the northstar engine is located at the bottom radiator hose (unlike most conventional cooling systems), the hose connects into the housing where you will also find the water pump. Remove the hose from the housing,then remove the two bolts on the flange,the thermostat can then be pulled out. Take note of the orientation of the thermostat as you remove it. Don't forget the new gasket when you install your new stat.
looked it up online and looks like it's on the front of the water pump in a thing called the coolant inlet housing. one end of it looks something like the letter y and the other end, where the thermostat is round. hope that helps
Most likely a cracked block or free plug that came out or loose. Other options are hozes, which I believe the dealer would have fixed. A third option is the water pump itself.
remove air filter housing,remove secondary air check valve bracket,if equipped,remove lower radiator hose from the thermostat housing,remove waterpump bypass hose, remove waterpump cover,use special tool to remove waterpump,install a new o-ring inwaterpump housing
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