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 Overheating? (bad coolant temperature sensor)

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Mikel
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Name: Mikel
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PostSubject: Overheating? (bad coolant temperature sensor)   Sun May 22, 2011 11:17 am

Hello,
My '97 Riviera is all of the sudden overheating, all the way into the red. I pulled over and noticed that the radiator was cold. I get hot air coming out of the heater, so I think that rules out a bad water pump, as coolant appears to be circulating that far. Could the thermostat be stuck closed?
Thanks.
Mikel
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Mikel
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Name: Mikel
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PostSubject: Re: Overheating? (bad coolant temperature sensor)   Sun May 22, 2011 12:37 pm

Update: Got a new thermostat and it made no difference. I did read the threads about purging the thermostat and I made sure all air was out of the bleed screw. The upper hose gets a little hot but the radiator remains cold. The lower hose gets a little hot, but I think it's residual heat from the engine coming from that side, not from the radiator.

I started the engine with the thermostat housing off and no thermostat, to see if the water pump was working. Coolant began coming out at a leisurely pace (I was expecting more of a quick stream). I put the housing back on (no thermostat) and it did exactly the same thing. No significant flow and the radiator remained cold.

I suppose I'm looking at a water pump at this point...? Thanks.

PS. There is something that really puzzles me - The temp gauge will go ALL the way into the red (260F) but there is very little pressure in the radiator hoses. The engine doesn't feel abnormally hot either. You would think that at that temperature the coolant would start boiling and the hoses would be rock hard. I am not seeing any obvious overflow from the radiator.
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Mr.Riviera
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PostSubject: Re: Overheating? (bad coolant temperature sensor)   Sun May 22, 2011 1:16 pm

maybe you need to new temp sensor

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LARRY70GS
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PostSubject: Re: Overheating? (bad coolant temperature sensor)   Sun May 22, 2011 3:44 pm

De Tension the accessory belt, grab the water pump pulley, and see if you can wobble it. Spin it also and see if there is any resistance. I would also scan the car and monitor the coolant temperature to see if it agrees with the gauge.

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98 Riviera SC3800 All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
11.67 @ 115.49 MPH So far
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Mikel
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PostSubject: Re: Overheating? (bad coolant temperature sensor)   Sun May 22, 2011 6:05 pm

It was the $17 temp sensor... The car sat for 3hrs and it still showed 200F! Thank you all.
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dboydakid
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PostSubject: Re: Overheating? (bad coolant temperature sensor)   Sun Oct 16, 2011 2:46 pm

hey im looking for a coolant temperature sensor and i cant find it ..does anybody have a link to where i can purchase one?
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albertj
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PostSubject: Re: Overheating? (bad coolant temperature sensor)   Sun Oct 16, 2011 6:32 pm

dboydakid wrote:
hey im looking for a coolant temperature sensor and i cant find it ..does anybody have a link to where i can purchase one?

Where did you look?
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