Car seems to run great on flat terrain. but when I come to a just about any size grade for a considerable distance my temperature gauge starts to scoot up into the 240 degree range. even at reduced speeds. that never used to happen to me before.
Could be a long list of things that would affect the cooling ability of the engine, or things that produce heat.
A restriction in the exhaust, a restriction in the coolant flow thru the engine or radiator, even air flow thru the radiator.
Stephen, thank you for your input. I checked the radiator no blockages. I was trying to get it to overheat alittle today with no luck. I did a check on the thermal fan clutch. To see if it was engaged and the fan rotated as if un ingaged. so I'm leaning toward the FAN CLUTCH or a possible blockage in the CAT.
Clint, What is a Cluster??
If Clint was a suggested solution, it may not have been related to your problem. A cluster is usually the instrument cluster on the dash.
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SOURCE: 2002 reduced engine power light
You have some kind of ECU problem. You will need to hook to the diagnostic port to find the problem. Your vehicle has gone into limp mode. This enables the vehicle to run, but at a diminished level until you can seek help for the problem. Do not continue to drive it this way as you may cause damage to the engine depending on the nature of the problem.
SOURCE: 2002 Chevy Suburban: Fuel gauge reads empty, tank is half full
Youre gauge is controlled by a plunger in the fuel tank which is attached to the sensor and the fuel gauge. it sounds like when the plunger goes down half way its either getting stuck down lower then it should. Needs replacing. Any mechanic can do this install for you.
SOURCE: 2004 chevy cavalier temperature gauge is all over
Check your coolant level. If you have air in the lines, the times when there's no coolant in the area of the sensor will make the temp go up rapidly, then it goes back down when coolant hits it again. You need to get the air out of the system, or you WILL have larger issues at hand, like a blown head gasket, cracked head, reduced piston ring sealing, or material transfer from the pistons to the cylinder walls. One other thing that could cause this is a faulty thermostat.
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