Question about 1990 GMC Rally

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Over heating to 260 at first warm up then runs about 210

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Is the radiator full as well as the thermostat may need replacing as well as a coolant flush

Posted on Sep 12, 2009

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I Have a 1997 Pontiac Grand Prix, For months now my temperature gauge has been running hot to nearly 260 degrees. The car has never officially overheated although the fans do kick in, In the last few...


What's chances that the temperature gauge or sender itself is wrong?
Is the heat exceptionally hot? What temperature is the heater dicharge when the gauge reads 260?
I think that the sender is not expensive, try that. An auto parts store could get you an inexpensive dial gauge that you might be able to install in place of the sender.
Gary

Aug 02, 2011 | Pontiac Grand Prix Cars & Trucks

1 Answer

Ive got a 98 chevy k1500 with a 5.7 vortec the heater blows out cold air.. and the temp gauge goes sporadic going to 260 back down to 120 then stays steady at 210 then back to 260 then back down... ive...


You may two problems and one symptom. you may have a blend door problem that is not allowing air to circulate threw the heater core. also you may have a bad connection or weak coolant temp sensor showing you erratic readings and it may have nothing with the heat in the vehicle. you need to eliminate or separate the one of the the problems to diagnose your one symptom.

Feb 06, 2011 | 1998 Chevrolet K1500

1 Answer

Temp is flucuating between 210 260 when i give it gas when I am sitting idle it is on 210 just started no lights are on but the gages are moving.


First thing I'd do is check actual temperature (you can have a shop do this with a heat sensing gun, or just tape a thermometer to the upper hose and read it.) Make sure the coolant level is full and that the electric fan is coming on. If the system is working properly, then you will need to check temp sensor and gauges.
This isn't a "fix" only because you need to find out whats happening in order to know what to fix.

Nov 19, 2009 | 1998 Jeep Grand Cherokee

1 Answer

My 95 firebird with the 3.4 v6 motor, out of the blue, started running hot today and hit 250 on the dash.. i hotwired the fan cause it wasnt comming on even when the temp 210,thats why i done that,, and...


you might want to check the fan relay switch it out with one that you dont need tho run the car then if the car stays cool you know that its the relay. but if that doesnt solve your problem try replaceing the temp sending unit that controls the fan there should be to temp sending unit one for the guage and oe for the fan.help this help.

Nov 12, 2009 | 1995 Chevrolet Camaro

1 Answer

I think my thermostat is sticking. When the truck


yeah it sounds like it is sticking,,,i know some of the GMs have aoring seal in the thermostat and over time it gets stuck inside the thermostat and causes weird issues

Oct 16, 2009 | 2004 GMC Sierra

1 Answer

I drive about 260 miles a day. my 1999 dodge truck has been running about 210-230 degrees. i drive about 70 mph. if i slow to 55-60 the temp stays 210.


seems high to me. summer thermostats open at 185 , winter thermostats open at 195. At highway speeds , there should be more than enough air flow through the radiator to keep engine in the normal range. Your radiator might be pluged up and cooling poorly , but I suspect your temp guage might be inacurate.

May 07, 2009 | 1999 Dodge Ram

1 Answer

Engine Temperature Guage on Dashboard indicates overheating


Hi and welcome to FixYa,

Offhand, your described condition indicates a sticking thermostat, that is there is considerable delay before the thermostat opens. It is also possible that there is some restriction wherein the thermostat is not opening completely when the triggering temperature has been reached. As a test and to confirm, you could try temporarily removing the thermostat and operate the engine without one; observe temperature. The side effect of this test is that it would take some time to warm-up the engine, but operationally should not cause anything untoward. Of course, care has to be exercised that the gasket would still be intact.

Good luck and thank you for using FixYa.

Feb 11, 2009 | 1998 Jeep Grand Cherokee

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