Engine overheating

Tiny
HIDME
  • MEMBER
  • 2001 MAZDA MPV
  • 120,000 MILES
The dial board meter show close to H when drive 10-15 minutes with AC on. The coolant was boiled and escaped from reservoir. Haven't found leaking. Hear the fan running.
Can expert give idea how to diagnose and fix?

thanks
Tuesday, August 21st, 2012 AT 7:55 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Could be a thermostat or it could be a head gasket, have a shop do a leak down test to confirm.

Roy
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Tuesday, August 21st, 2012 AT 8:32 PM
Tiny
HIDME
  • MEMBER
  • 27 POSTS
Thank you!
I took off the thermostat and tested it OK. But coolant is all gone. I put it back and fill up coolant and let engine run, saw leaking from top of radiator. I could not tell it is radiator or hose. Should I open grid and bumper?
Thanks
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Tuesday, August 28th, 2012 AT 1:23 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You need to determine where the leak is coming from and anything that is obstructing should be removed.

It most probably would be the top tank of the radiator that is leaking. After repair, you need to monitor and check for leaks. Top tanks usually breaks over time when there is insufficient coolant in system.
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Tuesday, August 28th, 2012 AT 5:57 PM

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