1995 Toyota Camry Temp gauge goes to full hot

BARRYLB

MEMBER
1995 TOYOTA CAMRY
4 CYL
2WD
AUTOMATIC
150,000 MILES

I have replaced the radiator and thermostat, flushed the system, checked all the hoses and fans. I replaced the temp sending unit and the gauge still goes to full hot. Is the engine control module the only thing left?

Tuesday, August 25th, 2009 AT 12:28 AM

6 Replies

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

Check the engine coolant temperature gauge (on left OR right side of engine, depending on engine size). Also check the engine coolant temperature sensor (on left OR right side of engine, depending on engine size).

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Tuesday, August 25th, 2009 AT 12:39 AM

BARRYLB

MEMBER
4 POSTS

I replaced the engine coolant temp switch also. Removed thermostat to verify it is not thermostat, and it still goes to full hot. According to manual, the power for the coolant temp switch comes from or goes thru the engine control module.

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Tuesday, August 25th, 2009 AT 12:47 AM

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

If you are certain the gauge is reading inaccurately and the sending unit has already been replaced then it is most likely the gauge itself at fault.

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Tuesday, August 25th, 2009 AT 12:54 AM

BARRYLB

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4 POSTS

How can I rule out a blown head gasket?

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Tuesday, August 25th, 2009 AT 12:59 AM

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

One easy way to check for a cracked head gasket is to let the engine cool completely. Then remove the radiator cap. Ensure noone is near radiator, then start the engine. Rev the engine up to 3 or 4k RPM. If coolant shoots out of the radiator cap opening then you have a faulty head gasket or faulty head. Another way is to simply have it pressure tested at a shop.