over heating & building up excesive pressure

2002 MAZDA B2300
2.3L • 2WD • AUTOMATIC
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CLIFFDAYL
  • MEMBER
  • 1 POST
when drive my 2002 Mazda b2300 25 minutes, more or less at 65 to 70 mph or shorter time 10 to 15 with the ac running , I looses all my coolant from radiator bottle cap. already took the thermostat out engine and radiator fan is working don't know what to do next.
Jul 25, 2015 at 7:27 PM
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CARADIODOC
  • ✓ASE Certified Mechanic
  • 34,321 POSTS
  • ASE Certified Mechanic
First put the thermostat back in. It is supposed to restrict coolant flow so the hot coolant has time in the radiator to give up its heat. Right now hot coolant is going right back into the engine. The next thing is to have your mechanic perform a chemical test at the radiator to check for a leaking cylinder head gasket. If that is found, nothing else will solve the overheating. If combustion gases aren't found, you will have ruled out the most common and expensive cause.
Jul 25, 2015 at 8:13 PM
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