The temp gauge goes to hot and goes up and down very quickly. I flushed the system and while it was flushing it remained cool. What causes this?
Sep 12, 2011 at 4:02 PM
Temperature gauge is bouncing, the car runs fine otherwise
1972 MERCURY COUGAR
JLYANT
- MEMBER
- 3 POSTS
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JDL
- ✓ASE Certified Mechanic
- 16,098 POSTS
Remove the thermostat, hook everything back-up, run the vehicle, does the temp gage stabilize?
How hot does it get?
How hot does it get?
Sep 12, 2011 at 6:56 PM
The system cooled down a bit after the flushing. It doesn't actually overheat now it just runs really hot. I will try the thermostat step. If that is successful what is the next step?
Sep 13, 2011 at 2:57 PM
JDL
- ✓ASE Certified Mechanic
- 16,098 POSTS
Maybe an issue with temp sending unit on engine or wiring circuit. I don't have a location for that sending unit. I don't have any wiring info for that gage or sending unit.
Possibly air trapped in the system? Radiator cap--water pump-- combustion gases getting into the coolant. Do you have a catch bottle connected to radiator? If the engine gets too hot, it will pop the cap, coolant either goes into the catch bottle or over-flow tube pointed at the ground.
Possibly air trapped in the system? Radiator cap--water pump-- combustion gases getting into the coolant. Do you have a catch bottle connected to radiator? If the engine gets too hot, it will pop the cap, coolant either goes into the catch bottle or over-flow tube pointed at the ground.
Sep 13, 2011 at 3:50 PM
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