GMC Sierra

Why does your thermostat light come on and what can you check on 1998 GMC Sierra Chilton truck?

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2005-09-06 01:44:37
2005-09-06 01:44:37

What is a thermostat light?

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It could cause the check engine light to come on with a code concerning cooling system/thermostat performance.It could cause the check engine light to come on with a code concerning cooling system/thermostat performance.

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You need to rent / purchase an OBD II code reader to check & reset the check engine light.

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A defective thermostat can cause the engine to overheat. It can also cause the engine to not reach full operating temperature if the thermostat is stuck open. It is possible this could set the check engine light.

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The Check Engine light is on because there is a problem with the emissions system. Once you have the problem repaired the light will go off.

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You light the pilot. if it will not stay lit,the thermocouple is bad.

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Have vehicle scanned to have stored codes erased

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Hi. I replaced my thermostat twice - here is a word of caution: only use the thermostat from the Chevy dealership. I bought one from Autozone and it kept giving me the check engine light because the temp did not get high enough. I replaced it with the Chevy one and it worked perfectly from that point on - no more check engine light.As for the labor time, I'd suggest investing in a Chilton book that shows you how to do it. You have to remove the alternator in order to get to the thermostat (why did they put the thermostat on the bottom of the engine!?!?!) All in all it took me about 3 hours the first time and about 2 1/2 the second time - and I am just your average guy that doesn't mind getting his hands dirty in my garage.Hope that helps!

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This depends on the vehicle. If the thermostat is stuck open the engine won't get to the proper operating temperature which could trigger the MIL (check engine light).

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You need to rent / borrow / purchase an OBD II code reader to check the code.

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I would suspect the thermostat is stuck open. Replace the thermostat.

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check for a code . usually means you need a new thermostat

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Many vehicles will trigger a check engine code if the engine never reaches its designated operating temperature (Such as if a thermostat was stuck open). However, there are hundreds of other reasons a check engine light can come on. Putting in a thermostat solely because the check engine light came on is a very bad idea. Any time that light comes on you should have the vehicle scanned by a trained proffessional (The guy at Napa doesn't count). A good service technician can use the information given by the engine computer to determine what is wrong with the vehicle.

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This is too cool if the engine had been running for awhile. Thermostat is stuck open which causes the system to stay in closed loop, thus setting the check engine light. Drain and flush the radiator, and replace the thermostat. You may have the have the Check Engine Light reset with an OBD2 scan tool. Ask an auto parts store to reset it after selling you the thermostat and antifreeze for the repair.

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Yes. It can trip a code and illuminate the check engine light. Today's engines are designed to run with a 195 degree thermostat.

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Check stop light fuse Check bulbs double filamented smaller for brake lights Check the operation of the stop light switch Check socket for corrosion

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That is one of hundreds of possibilities. See related questions below.

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check with the dealership there was a recall to replace the switch for free! I had mine replaced...tombo

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Check the fluid level in the Saturn. Check the water pump and thermostat for failure. If they are not working the engine will overheat and the light will blink.

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the check engine light has to be cleared with the scanner, that wipes out the codes and resets. Answered by Littlestown Lube & Brake Littlestown, PA 717-359-5022 light will still be on. Black tape on dash light, best solution i can find.

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Start with a new bulb and check the fuses. Some of the GMs have a button next to the headlight switch that cancels out the dome light if so desired, check to see if that switch is on or off.

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The red light is for the water temp in the engine. get a mechanic to check the thermostat for u it might need replaced

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According to my Chilton repair manual, it is in the fuse panel under the driver's side of the dash. Chilton shows a 15 amp fuse for dome courtesy light in location # 14

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