Engine Overheated

1999 MAZDA MILLENIA
116,000 MILES
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JMELLO
  • MEMBER
  • 1 POST
1999 mazda millenia overheated, radiator was replaced, timing belt, and water pump replaced, new radiator cap. the thermostat was not replaced. car is running hot after stop and go traffic. fans are working. now car has not heat. purchased a leak detector kit to test for head gasket issue but kit says that thermostat needs to be open and coolant flowing through system. how can i know that the thermostat is open and coolant is flowing before doing the test. i was thinking to do the test before paying to replace the thermostat.
Nov 16, 2011 at 6:22 PM
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JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 POSTS
Most thermostats are designed to open at 195 degrees F. You have to assume it is working or remove it and test.

If you want, when the engine is cold, remove the radiator cap and start the engine. Allow it to warm up. When the thermostat opens, you should see the coolant quickly flowing through the radiator
Nov 16, 2011 at 6:28 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.