95 Mazda Millenia runs very rough after overheating
My 95 Mazda Millenia overheated and died before I reliazed that the needle was pegged above the "H" and now it runs very rough and barely stays running after a little bit of driving (about an hoursworth of driving). Orginally I was told that I blew the head gasket but I have compression in every cylinder and it will run for about an hour before it begins to overheat. Would an extreme overheating cause issues with the computer? It is hard for me to think that it is a blown headgasket when it runs for about an hour before it begins to overheat and gradually get worse and worse as it is driven. The water pump does need to be replaced and there isn't a thermostat. Any ideas will be greatlyt appreciated
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Re: 95 Mazda Millenia runs very rough after overheating
The compression test was a good test, but since you asked for ideas, I'd also check the following basic "naked eye" visuals:
1. Do you notice any white-ish smoke out the exhaust, especially after killing it then cranking back up?
2. With engine cold, take the radiator cap off and crank it. Does it act more violent than expected, like a geyser?
3. Loosen the oil pan drain screw to see if any water finds its way out from the bottom of the oil pan.
If so, to these tests... blown head gasket.
I hope NOT though... Good luck!
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If the engine overheated and now won't crank, you may have locked it up. If you can't turn the alternator or the crankshaft with a wrench, the engine may be trash. One of the cylinders could also be full of coolant from a blown head gasket.
Hello, dmaplang and thank you for asking your question on Fixya!
Here is a simple process that will walk you through a few steps that
will pinpoint the overheating problem on your 1997 Mazda Millenia,
without even using any tools. It has helped millions of people, and I am
certain that it will help you, because I wrote it for people in your exact situation. How to diagnose your overheating 1997 Mazda Millenia
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If your car ran hot, you may need to check the radiator for a leak. You always need to add antifreeze/coolant when you add water to your car. Check you owner's manual for the type they suggest and the proper mix of water to antifreeze/coolant. I had to get a head on my motor shaved when my car ran hot and later I had to get the hoses replaced. My radiator cap died following my replacing the radiator as it was plastic and when the car overheated it damaged the cap. How long was the car running hot? You don't want to be a penny wize or a pound foolish when it comes to engine overheating problems. You can repair on the cheap now and pay a lot more in the long run. Also, in the future when your car runs hot, you can turn on the heater --yes even when it is hot outside--I recommend opening up the windows. The heater fan will help to dissipate the heat from the car engine. It does work. I hope these help. Also go to a reputable repair shop. It could be your thermostat they can have check valves which get messed up but you need to check to see if it is your radiator or if there is a leak there or in a hose.