Topic: Mazda mx6 running hot....why???????????????

[bert96]

 A friend of mine got a mazda mx6 v6 1993,the problem is the car is running hot,he had change the radiator and the thermostat but still have the same problem,the fans work perfectly.What would be the problem?

Thanks

Bert

[bucky katt]

is the water pump belt or cam driven?

[bert96]

 To be honest,i don't know,but what i do know is,if the engine is running in the garage even at full throttle the car is running fine,if we take the road the needle is in the red....

What i found on the web is that the transmission run hot on these models and we should install a oil cooler for the trans,so it could be that problem....

[Jerry Rxman Griffin aka MuthaF'er]

Smell the coolant for exhaust fumes (possible blown head gasket)

[bert96]

 No white smoke at the exhaust,but if it was that,it would run hot all the time.

[lynchj]

There could be blocked passages in the block or head, this would / could happen if the coolant was not changed over many years it gets acidic. If the radiator was blocked up the same thing can happen in some small passages in the head.
Running in the garage doesn't put a load on the engine, you can get by with a marginal cooling system under low or no load.
 The other thing that probably has been checked is the thermostat, if not pull in out, you can check if it opens in a pan of hot water on the stove and a thermometer ( it should open by 190 degrees). You can pull it out and run the motor without it but don't leave it that way for weeks, it will be running rich. If it's still hot without the thermostat and a new radiator, then flush the living daylights out of the motor with a flushing solution from any auto parts store, Prestone makes a good one, it takes a few flushes sometimes. 

[bert96]

 The radiator  and the thermostat are new.We run the engine at 3 000 rpm(for about 30 min) in the garage and  the temp gauge was normal,so,i think IF there is something in the block or in the head that blocked passages we should see something wrong even if there is no load on the engine.That's why more i think of it more i think it could be the transmission the culprit.We will install a big oil cooler and we'll see.

Thanks for your help guys

Bert

[jsaab2748]

Smell the coolant for exhaust fumes (possible blown head gasket)

...........X2

[bert96]

 We have install the oil cooler but no change,still running hot.We have flush the system with a special solution but still the same they said to run the engine for 10 min,we leave it for 30 min just to be sure everything was clean.

So here what we change so far,

1-Radiator
2-Thermostat(we have change it twice!)
3-radiator cap

The car is easy to start,a good idle,no white smoke....i rally don't know what to do now!!!!!!!?

[bucky katt]

is it just the temp gauge showing it's hot? or is the engine really overheating. in other words could it just be a bad temp sensor?

[bert96]

 Believe me the engine is really overheating!

 Don't know,but if the water pump is not good,i should see something leaking,or i should hear the bearing or something like that....no?

If the catalytic converter is block,the engine would overheating too,no!?

[Jerry Rxman Griffin aka MuthaF'er]

Can/did you install the thermostat upside down?

[bert96]

 No i did not,but even without the thermostat the engine is running hot

[Terry in Australia]

Hey Bert, if it's only happening when the cars in motion, have you checked to see if you've got a partially sized brake caliper? I did on my old Fairlane, and that engine would boil like a #$%*! Sometimes you've got to look elsewhere for the source............

[bert96]

 Everything else is ok,the car is on the lift right now,we have take a look to find something else with out luck