Question about 1992 Chevrolet Corvette

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85 Corvette Temp Gage fluctuates from 170 - 250

I have a 1985 Corvette with 98000+ plus on it. it was a daily driver until about a month ago. i drive only about once every week or so, and i have noticed that the temp runs up especially when the AIR is on. if i let it idle the temp climbs beyond the 225 limit (when the fan is supposed to start). i have noticed that the fan has been running at about 170 (that may be do to the air being on.) i had to have the complete EGR process rundone around Jan. this year. they put all new parts including thermostates and they had to clean out the intake manifold. it ran ok after that, but it seems like after i quite driving it daily, i now have the iractic temp problem.

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  • normtx63 Jun 23, 2009

    thank you for the 2 responses. i did go and tested the fan by starting the car and letting it heat up. the manual said the fan should start at 225 degrees, and it actually started at 227 and shut off at 117 degrees. i let the car run through 3 consecutive rounds, and each time it did respond the way it had in the past. i don't know if letting it set for a couple of week without starting caused something to stick or not, but i again drove it a couple of days later and it seemed to do ok..... thanks for responding to my questions.

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Being an 85, chances are that your radiator is partially plugged (calcification develops on the core ends and prevents proper coolant circulation)
Sometimes a flush will help, or you can change the radiator.

Posted on Jun 18, 2009

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The ECM on your vehicle will not go into closed loop mode until the coolant temperature sensor will allow sufficient return voltage. It usually averages somewhere between 160 and 170°. The correct operating temperature for your engine is 195°. We can conclude that this is indeed an unwanted situation. Newer models would throw a diagnostic code illuminating the check engine light for the in capability of the engine to reach operating temperature.
A single lead connector is plugged into a sensor that is located on the passenger side cylinder head between cylinders one and three.
This is the coolant fan switch and is designed to complete a circuit when the engine temperature comes close to 195°.
I believe I do recall correctly it being a green wire with a pink stripe. If this wire anywhere a long the line from the temperature switch screwed into the cylinder head to the coolant fan relay has a breach and is grounding out, it will force the fan to remain on regardless of temperature. This is where I would look since there's a good likelihood that the wire harness may have affected this portion of the wiring loom. If the wires are fine, the it's going to be a bad temp sensor. The bypass which is located in the heater control console. This vehicle is designed so that when the air conditioner is turned on, it will activate the coolant fan. The bypass which shares the same color wire that I gave above. It is in the exact same portion of the circuit so the same rules apply. If there is a breach anywhere from the bypass switch to the place a tap into the circuit and is grounding out, the fan will be forced to remain on.

Good luck and hope this helps.

Posted on Jun 18, 2009

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