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Losing coolant?

Tiny
EBIZTOM
  • MEMBER
  • 2003 JAGUAR S-TYPE
  • V8
  • 2WD
  • AUTOMATIC
  • 68,000 MILES
I am losing about 1 qrt of coolant per day. I don't see nay leak on the ground or around the radiator. I've recently replaced the cap. Could this be a thermostat problem? How can I tell if that is the challemge. How about the water pump?
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Sunday, December 13th, 2009 AT 7:50 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

You need to first do a pressure test of the cooling system.
A pressure test will crate pressure in the cooling system similar to when the vehicle is at operating temperature.
That way any leak will be easy to detect.
The pressure test should be done when the engine is cold.
You can rent those pressure testers at your local auto parts store.

Here is a video guide of how to perform the test:

https://youtu.be/W8kra65m15c

https://www.2carpros.com/articles/radiator-pressure-test

Please let me know of any questions.
Thank you.
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Friday, August 27th, 2021 AT 5:04 PM

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