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sounds like thermostat is stuck open and not allowing coolant to cool in radiator long enuff altho some form of coolant temp sensor may be at fault also since this is an older vehicle first thing in the morning start the car and immediately open the radiator cap if the thermostat is stuck open then you will see flow in the radiator thru the core it should not flow until the car has reached operating temp...otherwise check the sensor that controls your electric fan and its circuit

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I had this same problem. If you set the a/c blower to high it will turn the fan on. If this is the case you have a bad fan relay.

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Part 2. I meant to say that if you set your a/c blower fan on high it should turn on your electric radiator fan. If that's the case you have a bad fan relay.

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If your fan isn't spinning, you have a failed fan clutch. A 1968 Caprice did not come with an electric fan thermostat unless it had a big block. A 350 is a small block, and shouldn't be there unless someone swapped out the big block, in which case you may have a failed electric fan thermostat.

If you have an aftermarket electric fan, either the fan failed or the relay failed, or maybe a fuse failed. It's a good idea to replace the thermostat since it is rusty in appearance. Get this repaired before you have bigger problems. Good luck.

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Thanks for all of the advice. The previous owner swapped out the 327 and reaplaced it with a 350 to include an electric fan. Had the relay checked and its fine. Purchashed another thermostat and will install it tomorrow. Currently getting ready to deploy to Iraq so I wont have much time to mess around with it. I was advised today to consider a manual fan in place of the electric. If anyone has any more advice, please share. Thanks again.

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