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Engine overheats every 400-800 miles.

(1996 Mazda 626)
in Douglasville, GA on June 04, 2011
at first had a leaking coolant problem...replaced radiator and temp gauge. still leaked so replaced all hoses. now no leaks but still overheats. sometimes temp needle will point to hot at stoplight then when resuming driving needle moves back to middle/normal temperature. this occurs sometimes when i drive uphill also!
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Popular Answer
on June 04, 2011
you have said nothing of the thermostat which is the most important piece.

the fact you have driven it overheated may have done internal damage to the motor.
have s hop do a leak down test to make sure the head gasket is not cracked.

Roy
on June 09, 2011
REPLACED THERMOSTAT FEW MONTHS AGO TOO! JUST TOOK TO SHOP TUESDAY. READY TODAY. RAN COMPRESSION TEST...GASKET GOOD.HOSES REPLACED UNDER RADIATOR (BUSTED OFF WHILE DRIVING ON HIGHWAY TUESDAY). ALSO FOUND OUT COOLANT IN RESEVIOR WASN'T GOING TO RADIATOR. WILL C HOW LONG CAR WILL RUN!!!?? THANKS
on June 09, 2011
compression is good but what about the leak down??
if the hose busted off, then there was extreme pressure build up. i think you have blown a head gasket. i would not drive it till this is resolved or you may ruin the motor.

Roy
on June 10, 2011
MECHANIC SAID HEADS WERE GOOD! OR AM I BEING SET UP FOR MORE REPAIRS!?. I ASKED IF EVERYTHING WAS GOOD TO GO THIS TIME, HE STATED THAT IT SHOULD BE. SPENT OVER $1000.00 ON THIS COOLANT LEAK-OVERHEATING PROBLEM SO FAR AT THIS REPAIR SHOP! REPLACED ALMOST EVERY COMPONENT,I.E.WATER PUMP,RADIATOR,THERMOSTAT,HOSES,ETC.! IT STOPPED LEAKS BUT NOT OVER HEATING OF ENGINE.
on June 10, 2011
damage may already be done. i suggest go to another shop for a second opinion. tell them the hisotry and ask them to do a leak down test for a possible blown head gasket

Roy
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