Question about 1993 Mazda MX-3

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93 Mazda mx3

The engine overheat after running for a few minutes. I have changed the thermosat, checked the radiator for clogs. I though it maybe the timing belt that I change about 12 mos back but thats not likely. However I did recall the heater in the car stop working right before the car started overheating.

Questions: Could the heat exchanger on the type car cause it to over heat?

Also - could the airflow control valve be a source of the problem if not the above possible cause?

The below options have been exhausted
- timing checkout good
- Radiator is not clogged
- Engine water through the crank case is good
- Thermostat was changed out

Appreciate any opinion or diagnostic information. Thanks

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  • 54 Answers

You need a new heater Core.

Posted on Nov 14, 2008

  • loydmiller Dec 07, 2010

    is your radiator hose collasping for pressure, hindering water flow

  • loydmiller Dec 07, 2010

    is your radiator hose collasping for pressure, hindering water flow

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Im having issues with over heating ...i changed the thermoustat the radiator cap and it cant be my pump cuz im getting flow what could be happening ....oh this didnt happen untill i got my three belts


are you sure the dash guage is not fibbing, many do on old cars.

use a pyro gun and not guess.

sure overheating makes any engine run bad, and misfire.

and even can warp the head. engine will ping hot too. (bad happens)



correlation is not always causation. (find truth first, then lay blame)

but do check for missing belts and loose belts or routed wrong.?



The RaD TUBES must not be clogged. a 94 is a very old car.

we use a $20 IR pyro gun to see if rad core tubes read the same

top and bottom if NOT, they are cloggled. 5min work on a hot engine. (harbor fright sells 3 guns all 3 work like MAGIC)



is the RAD full of 50% AF coolant> , look in the RAD hole, not the side overflow clear tank (useless to look there now, many are bad, ask why)

pump most flow. sure.

thermosat not backwards or upside down and bleed hole must be UP

radiator core or the A/C cond. core up front must not be packed in leaves or bugs. or dirt. clean it.



also a weak clogged rad, will overheat when a bad running engine goes into limphome mode, (retarded timing sends tons of extra heat to the water jackets , when this happens, ask why technically)

so you have 2 things wrong, both add up to overheating.

I can demonstrate this .



Is the check engine light off, running and not overheated yet.?

does it overheat moving and parked.?

or only parked. or both?

if it never overheats moving fast , the fan is no good.

if it only overheats parked, the fan is bad.

so when it overheats and when not, is a key bit of evidence..

test the fan, the FSM covers this check. for all cars.

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