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I had posted this problem a few weeks ago, about my saturn overheating. the temp gauge goes past the boilling logo on the gauge.just befor the gauge reaches the last line on the gauge the fan comes on , i did remove the thermostat so it should run cooler but its not. so today i end up spending 90 dollars for the radiator. and stiil the temerature goes way up.. can some one help me help help help........help whats my next step....
or is there a fan switch that will turn the fan on early...?????
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check that you have a thermal switch to switch on the fan and not a temp sender unit. One completes the curcuit when a set temp is reached ,the other is a resistance unit that lowers the voltage which in turn reads hotter on the gauge.
This is a sign that the thermostat is sticking shut and then opening after the temp gets past a certain point. If the heat gauge goes to high and then drops down suddenly, this is the likely culprit and you need to replace the thermostat - again.
I have had them arrive from the parts store and be defective.
how about the coolant temp sensor, they had alot of problems with that sensor and also the plug for it,some have two of these sensors side by side, one for the gauge and the other for the fan, i would replace these first and go from ther good luck,
Be very careful as overheating can cause permanent damage to the head gasket.Now whenever an engine temp reaches half then the fan should start,so watch if this is working.Allow engine to run and watch the temp gauge goes up..Once it is half then the fan should start, if it does not replace thermostat..Else watch the radiator as it may be blocked.
p303 is a cylinder 3 missfire I woul first check the coil and then the ingnition module, Then if this dont work you could have a bad injector. If after testing and still no fix you should check the compression in that cyl.
did u use oem thermostat or at local auto parts? if oem u ok,did put back the plug on temp sensor?did u burp the water line after you change thermostat?
Almost sounds like the same symptons as my van. Turns out the guage was not the problem. The van was in fact running hot because the electric radiator fans were not kicking in when the engine was hot. I replaced the relay switches for the fans. There are two of these in the fuse panel under the hood. There has been no problem with overheating since
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