700R4 torque conv makes camaro overheat - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-31-2005, 08:15 AM
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700R4 torque conv makes camaro overheat

My daughters worn out (194,000 miles) 92 Camaro RS overheats in stop and go traffic. I checked all of the cooling system with the car in the driveway and all is well there. I had to stop because she left it with no gas.

On the way to the gas station I noticed something is definately wrong. With the car in gear stopped at a traffic light, the torque converter seems to be locked up. The brakes have to be on hard to hold the car, the engine RPM falls until the computer raises it back up. The car feels like its being power braked.

I got the car home and idled it in gear. Slowly but surely the temperature began to rise. Given enough time, the car would overheat since the electric fan was not keeping up (outside air temp 50). I suppose the transmission oil could be heating up the radiator coolant, but I think it's more likely that the engine load is too high for the cooling system with the car stopped.

The cheap fix is to put it in neutral at stop lights, which does lower the temperature to normal. Do any of you know the next cheapest fix? The edmunds value of the car is $116 trade in, $800 private, $1800 dealer so any real work seems a waste.

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Old 10-31-2005, 08:23 AM
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Try turning on the heater. If hte temps rise slows or goes down, the system needs more airflow. If the heater blows cooler air at idle than at speed the water pump is weak and dying or the engine rpm is to low to spin the water pump fast enough.
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Old 10-31-2005, 11:15 AM
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Had a similiar problem with my daughters Cavalier. Turned out to be a faulty lockup switch on the transmission. Cost me about $35 to fix it. It is comporable to trying to stop a standard car without putting in the clutch. The Cavalier had a 4 cylinder and it would actually die when stopping.

Short term fix is to unplug the lockup circuit from the transmission. Gas mileage will suffer as the trans will no longer go into overdrive until you fix the switch or lockup solenoid.

Vince
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Old 10-31-2005, 08:20 PM
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I am of the opinion you have other problems than the tranny. Engine problem. What engine is this?

If the converter 'locks up' the engine will die if the car is stopped.

If the tranny is a 700r4 , there is no oil pressure for lock up to apply in 1st gear. If the tranny is getting so hot that it is over heating the engine cooling system, I would think the tranny would puke hot tranny fluid out the breather tube on the tranny.

As mentioned , unplug the electric connector from the tranny and see if that helps.

Good luck
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