Question about 2000 Pontiac Sunfire

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How do you know when the radiator is full

There's no radiator cap on this car...it has a small tank that looks like the washer fluid tank....I keep filling it up, but it disappears. I don't have a owners manual...The car was running hot....I changed the thermostat and that seemed to fix the problem....I need to know how much coolant to put in now so it don't over heat again....Thank you.....

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  • bossman1050 Oct 09, 2008

    Well man, my sunfire has been sitting for about a year now because of this same issue. As you can tell mine will not even crank now, guess I will have to replace the whole engine.

  • Anonymous Mar 31, 2014

    could it be related to improper radiator cap

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Leave the overflow tank cap off and start engine. turn your heater setting to max heat and fan on highpour 50/50 mixture of coolant till you see the coolant at the proper level on the tank. wait for the vehicle to reach optimum temp about 180 degrees. you should feel; the upper radiator hose it should be hot. then check level of coolant in overflow tank fill to proper level if neccessary. A quick note if you continue to lose coolant and can;t find a leak chances are it's being burned in the cylinder and this would mean you have a blown head gasket. to check this just start the vehicle the next day if there is white smoke yo have a seeping gasket if it's a constant white smoke then it's a severe problem and needs to be repaired immediately or you will warp or crack the intake manifold , the head or the block.. please rate this........thanks

Posted on Sep 24, 2008

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Please note that some vehicleshave the radiator cap relocated to the overflow tank. You must have the proper radiator (pressure cap) or your coolant will boil and lease the cooling system as steam causing the system to be low of coolant thereby causing it to overheat even further.
The radiator CAP is the most important and most overlooked part of the cooling system.

Posted on Feb 13, 2013

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Posted on Jan 02, 2017

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