1990 Oldsmobile Cutlass a/c

Recharging the AC had nothing to do with the car overheating. If the cooling fan comes on and the car still overheats, chances are you have a bad thermostat or a plugged radiator.

i replaced the thermostat it was stuck open. flushed and filled the system. the fan dose not come on so i hard wired it to a togle switch and it turns on and seemed to keep car cool but the next morning i had a big puddle of coolent on the floor the whole sytem drained out. and the radiator has a very big crack on the bottom. if i buy and replace the radiator with a new one will that solve my problem?

If the radiator is cracked, it will need replaced regardless. However, if it didn't overheat before the coolant leaked, a new radiator should take care of the problem.

i will replace the radiator and get back to you about it. a friend of mine has told me it could be the heater core also, would that efect the temp of the engine?

The heater core won't cause the engine to overheat.

Let me know how things go after the radiator is replaced.

Since the fan is now wired to a switch, it may also be a good time to replace the relay.

i have changed the radiator and the coolant. it overheats with about a half hour of driving. the transmission fluid is very dark looks a lot like oil. would that help the motor stay cool if i change that. also when it over heats the temp light dose not come on for awhile but i can here it boil in to the reserve tank before it gets to hot. thank you for your input it has helped a lot so far.

You've done it all. The only other thing I can think if is a bad head gasket. Have you ever checked compression to make sure you don't have a weak cylender?

As far as the transmission, it won't cause the engine to overheat, but you should have it serviced.

i will check the compression and service the tranny. and see how that does. thank you for your input.

i did the compression test 1- 98psi 2-100psi 3-102psi 4-99psi 5-100psi 6-101psi. that seems good i looked and it said all should be 100 psi. i had my tranny serviced and the car stays cool the temp light wont come on but when i shut the car off after driving for awhile it is boiling or bubbling in to the reserve coolant tank. what dose that mean ?