Water pump leaking after replacement

Tiny
DEREK BROCK
  • MEMBER
  • 2003 MAZDA MPV
  • 2.3L
  • 100,000 MILES
I replaced the water pump and everything went well. I tested it by allowing the car to run for twenty to thirty minutes and I did not see any leaks. The customer called and said that it is leaking again. I have not checked to see if it is coming from there or somewhere else. My question is, when I removed the water pump there was not any sealant used on the old surface so when I put the new water pump on I did not use any sealant. I am wondering should I have used some sealant when I put the old one on? Also, I am working outside and it is a little cold out. I did not change the water pump housing I only replaced the impeller side of the water pump and the belt.
Saturday, February 3rd, 2018 AT 6:06 AM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
First of all you need to check where the leak is coming from. There is no point speculating and guessing what could be the cause.

It could be due to parts other than the water pump as cooling system components can fail one after another. When a component that is leaking has been replaced, the pressure in system would be forced out of other components that are failing if they had not failed in the first place.
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Saturday, February 3rd, 2018 AT 6:30 AM
Tiny
DEREK BROCK
  • MEMBER
  • 2 POSTS
Thank you, I will check it tomorrow and get back to you.
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Saturday, February 3rd, 2018 AT 6:36 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,279 POSTS
Here is a guide that can help as well:

https://www.2carpros.com/articles/car-is-leaking-coolant

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Monday, February 5th, 2018 AT 11:40 AM

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