95 corvette over heats when sitting

Steven Byrns

Asked by Oct 12, 2014 at 01:40 PM about the 1995 Chevrolet Corvette Coupe

Question type: General

i have replaced water pump, temp sensor, changed radiator to 3 core, and replaced relays
still no luck. fans only come on when my a/c is on im stuck please help

5 Answers


The cooling fans are supposed to come on when the a/c is on. With the a/c off, the computer turns on the cooling fans when it sees the coolant temp getting around 220'. There is a sensor that reads coolant temperature that tells the computer what temp the coolant is. The sensor only works properly when it is in a liquid. If there is a bubble of air or steam at the sensor location, it will not read the coolant temp, or the sensor may be bad, or unplugged, or the cooling fan relay may be bad.

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Steven Byrns

could it be the fan switch?

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Heat control valve or temperature sensor are sticking. replace original parts.

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John Carson

If the fans come on with the A/c, it is not the fan switch. If you have dual fans, and both are on with the A/C it6 very well could be the sensor. Common problem. Also check for any breaks in the wires from the sensor or a lose connection.

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Please note that the engine temp sensor and the radiator fan switch are separate items. When my trouble code indicated engine temp sensor, I replaced it and the system was still not cooling properly, so I had to replace the radiator fan switch also. Both units look like engine temp sensors and both monitor coolant temperature. The sensor is mounted in the block and the switch is mounted in the thermostat housing.

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