Question about 2001 Mazda 626

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Overheated and loss compression.

Car overheated and now will not start mechanic says loss of compression. how do I or can I even fix this?

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  • Mazda Master
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The most common cause is a blown head gasket and sometimes a warped head. Someone would need to remove the cylinder head and have it checked for damage, then replace the head gasket.

Posted on Jul 16, 2013

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Posted on Jan 02, 2017

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freetek
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SOURCE: Overheated, now won't start

I would pull the plugs and check them for the presence of water beads. Any time an engine overheats severely, there is a good chance of having a blown head gasket and if this happens, when cooling, coolant can be sucked past the breach into one or more cylinders.

Posted on Mar 22, 2009

gypsycat00
  • 224 Answers

SOURCE: at first the ac stopped cooling. then the car

Turn your engine on with the A/C on high. Watch your cooling fans mounted behind the radiator to make sure they are running. If they're not running, you have something wrong in the electrical side of the fan system. The cooling fans are essential for cooling as they pull air through the radiator when the vehicle is not moving fast enough to cool the coolant. The problem probably lies in a relay, so replace the high speed fan relay with one you know works but is not essential for moment (rear window defrost or something similar) and put that in the relay spot for the high speed fans. If the fans kick on now, you need to replace your relay and this will probably also fix your overheating.

Posted on Jul 12, 2009

canbruce75
  • 1776 Answers

SOURCE: 2001 honda ex-Car overheated and doesnt start anymore!

The car overheated and something caused the overheating. Bad thermostat, low coolant level due to a leak or busted radiator hose, inoperative cooling fan, or a bad water pump. Lots of things can cause an overheating condition and I am not really sure that any blame can or should be assessed to anyone regarding what caused the overheating....something caused it and I would be hesitant to blame the driver. I doubt that the person did anything devious like drain the coolant out. However, poor judgement was used in continuing to drive the vehicle after it overheated. This can cause major problems like a blown head gasket or even a completely blown engine. Maybe the lady panicked or was unaware of the damage that it could cause to keep driving. I suspect that it wasn't something malicious (she probably feels bad enough, already), but just a simple error in judgement. I would probably give her the benefit of the doubt and explain (calmly), the mistake that she made and why it was a mistake. She didn't cause the original problem, she just handled it badly. I would check the condition of the vehicle out and go from there. What's done is done.
Start by trying to find out what caused the overheating and if it caused any permanent engine damage. Some of the things that I mentioned earlier would be a good start, or you could have a certified auto tech take a look at it. It was really nice of you to lend the use of your car to someone. I am really sorry for the trouble you are having and I hope this helped. Best wishes.

Posted on Sep 24, 2009

  • 1455 Answers

SOURCE: my car overheated now engine is siezed. how do you

Sorry to say there is no much to do with a seized motor except to replace it.

Posted on Oct 25, 2010

  • 2002 Answers

SOURCE: I have just bought a 1990 Mazda 626 which has

They could but the most likely culprit will be a bad head gasket and/or a warped head. Aluminum doesn't take extreme heat well. Hope this helps.

Posted on Aug 21, 2011

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Engine overheated. now it will turn over but wont start. what's wrong?


You may have SEVERAL serious problems because of ovreheating and if that's the case, you most probably don't have the proper equipmente and knowledge and you can't solve them on site. Excuse me if you DO have..
Wait till car cools down completly and try If still you can't start the car, call a good mechanic or tow it to your mechanical service of your trust.
Actually, you can keep waiting for the answer of someone who knows more about cars then me

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The engine is probably cooked.
A mechanic would need to check for compression and the other factors to verify the problem.

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If overheated bad enough to blow a head gasket then the compression is leaking into the cooling system. there is not enough pressure left for heat expansion to keep the gas burning. check engine compression if low due a pressure volume loss test.

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Only if overheated bad enough, it could seize up the engine. But if it was seized, there is no way to do a compression test. ?? Take the bas***** to court. If truly no compression, the engine is shot, they didn't overlook anything, but they should be liable for a new engine- a warranty is a warranty or it is worthless. Sue them!

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Overheated but now will not start


I would do a compression test on all cylinders, first.
It is possible that it got hot enough to have melted holes in the pistons, cracked the head, or maybe blown a head gasket.
I would do compression test first.

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Pour oil into cylinders and crank it over. Reinstall plugs and try to start. If neccessary, check compression. Takes at least 120 psi compression for engine to start easily. Probably overheated and destroyed the rings.

thats why it is important to scan the dash gauges while driving so this don't happen. Quickest fix if rings are shot is to replace the engine with a junkyard unit.

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check to see if your engine oil and antifreeze are mixing.if overheated you burned ur head gasket car will not turn on because it loosing engine compression. to check this you need to do compression test..ur engine will seize if you keep starting it.and letting it keep shutting off.keep damage to a minimum internally

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