Antifreeze keep backing up in the overflow

Tiny
EXPLORER2710
  • MEMBER
  • 2002 FORD EXPLORER
  • 163,231 MILES
I have a 02 Ford Explorer and my antifreeze is backing up in the overflow bowl. I have changed the cooling temperature sensor, thermostat and thermostat housing case. Tell me what can I do to fix it?

The antifreeze keep backing up in the overflow bowl and it seems that the antifreeze is not running through the engine. Can you please provide some assistance.

Thanks
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Monday, February 13th, 2012 AT 12:31 AM

5 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Have you tried flushing lines/hoses or blowing air thru them?
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Monday, February 13th, 2012 AT 12:44 AM
Tiny
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No I have not.
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Monday, February 13th, 2012 AT 11:50 AM
Tiny
FIXITMR
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It's also slightly possible the water pump is defective.
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Monday, February 13th, 2012 AT 7:18 PM
Tiny
EXPLORER2710
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If the water pump is defective, wouldn't it leak?
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Monday, February 13th, 2012 AT 7:40 PM
Tiny
FIXITMR
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Usually yes but if impeller is loose or broken that may not be the case. Like I said, it's a slight possibility if clearing lines shows no change. When did this problem start? Any recent work done before hand? Any stoppage anywhere in cooling system might cause this symptom. Smaller hoses would be more likely to clog.
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Monday, February 13th, 2012 AT 7:59 PM

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