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Corolla temp - overheating

Greetings

The puzzle of why the car was overheating has been solved.

It was not clogged radiator (Internal/external), dud pump, leaks, thermostat, coolant type or level, radiator pump, EGR valve, belt tension or timing.

It was confirmed (or actually disproved) during a 4 hour freeway run with a multimeter and thermocouple insitu. Despite the guage showing red zone and even higher than red super hot, the coolant temp never got higher than 92 degrees celcius (+/- 3 %).

Travelling with the needle in the red for over 120 kilometres meant that either Toyota build bomb proof cars, or, the temp sender is stuffed.

Thanks to all that offered ideas.

Cheers

Hammo

Reply to
hammo
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The question: Were you measuring at the same point that the temp gauge sender is?

Reply to
Hachiroku

The answer:

No, I was measuring the coolant temp a short distance from the position of the temp sender unit. The absence of steam, nil loss of coolant and that the gauge was showing the temperature was in the red when the thermo couple showed it was at 70-75 C, I am not concerned in the minnimal difference in positioning. The flow rate of the coolant at engine speeds of 3000 rpm plus suggests that the minimal difference in location is also negligable.

Are you suggesting that the problem is not due to the sender unit?

Cheers

Hammo

Reply to
hammo

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