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Another Hot Toyota

Q. My car was over heating. I took the thermostat out of the car and noticed that the fluid in the radiator was still not moving. Is there anything special that I should check? Any assistance would be helpful.

  • 1983 Toyota Cressida
  • 6 cylinder
  • Automatic Transmission
  • 200K
  • Fuel Injection
  • 4 Wheel Disc Brakes
  • Power all around

Symptoms:

  1. Running Hot
  2. Small Leak in the Radiator
  3. After running the car for an hour, the radiator cap was still cool.

A. The most likely problems here are a weak water pump or partially clogged block water passages. With 200,000 miles on the car, these are distinct possibilities .Please see the question A Hot Toyota for a complete explanation of this problem

Another possibility is a clogged radiator. The fact that it is starting to leak is an indication that it's useful life is about at an end. However, radiators can be repaired and a good, reputable shop will tell you if it is worth repairing. If it is clogged, they can remove the tanks and run rods through the core to clear it out. After you determine that the radiator is in good shape, a good reverse power flush would be the next step. It is important the radiator be in good condition before you do the flush. I did a power flush on a 1983 Cadillac and when I was done, the radiator had developed about a dozen leaks. The cores were so thin that the cleaner just cleaned it to death.

Run the car for about 30 minutes and when it starts to overheat, turn the heater on full blast. If the air comes out hot and the radiator is still cool and the temp gauge starts to drop, you definitly have a clog somewhere.

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