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Cooling system pressure tester

Tiny
DR.DRE
  • MEMBER
  • 2012 CHEVROLET SONIC
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
I fit the cap on expansion tank (no radiator cap), the needle on tester gauge will not move. No pressure builds in tester.
Sunday, February 25th, 2018 AT 10:58 AM

7 Replies

Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
Be sure that the fitting is tightly on the reservoir and that it is sealed very well. Also, make sure that the reservoir is not leaking itself. If you have a really big leak anywhere in the system, that will keep it from building pressure.
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Sunday, February 25th, 2018 AT 6:42 PM
Tiny
DR.DRE
  • MEMBER
  • 5 POSTS
Okay. The kit I have oddly enough, has no adapter for GM/Chevrolet but it has one that fits perfectly. I used the adapter for Ford on a Ford and it only got to 2psi.

Thanks for the response.
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Sunday, February 25th, 2018 AT 7:18 PM
Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
Have you filled the cooling system?
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Monday, February 26th, 2018 AT 3:26 AM
Tiny
DR.DRE
  • MEMBER
  • 5 POSTS
I think that may be the issue. I filled it and it appeared to be holding full but did rescind a little. Should engine be running while filling? I had it shut off.
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Monday, February 26th, 2018 AT 4:32 AM
Tiny
DR.DRE
  • MEMBER
  • 5 POSTS
Sorry, the word I did not mean the water "rescinded" but it "receded". Thank you.
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Monday, February 26th, 2018 AT 4:48 AM
Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
Yeah running it while filling will get some of the air out of the system and get more water in there, and make it easier to pressure test it.
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Monday, February 26th, 2018 AT 6:51 PM
Tiny
DR.DRE
  • MEMBER
  • 5 POSTS
Okay, thanks again.
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Monday, February 26th, 2018 AT 7:14 PM

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