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1993 Mazda 626 DX 4dr Sedan

1993 Mazda 626
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January 12, 2013, 10:23 am

Chris A

Question: why when i put a new thermostat in does it idle odd and heat up

I bought a car and the temp would get cold after i drove a consistant speed and someone said maybe its the thermostat so i look and there is no thermostat then i put one in and it starts idling od and heats up what would cause this to happen pls help

January 18, 2013, 4:34 pm

Ron W
Expert Mechanic

Heating up is normal as long as it doesn't overheat.

If the t-stat was missing, the idle issue was probably always there and was masked by removing the t-stat.

Sounds like it may be a heat related idle control issue. When the car is warm the computer adjusts the idle circuit. I would suspect it is reacting to a defective sensor. You'll need a shop to diagnosis what is the root cause.

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