Codes P0355 and P0357, has a coolant leak?

Tiny
PETPARENT
  • MEMBER
  • 2004 MERCURY GRAND MARQUIS
  • 4.6L
  • 2WD
  • AUTOMATIC
  • 247,500 MILES
I believe it is the intake area because coil packs and spark plugs had antifreeze on them Car also has codes p0355 and p0357. Plugs were not cracked. If it is the intake gasket like I think it is should I repair that first before fixing P0355 and 357? Also, I could not pressure test the cooling system because I did not have the proper adapters for my car.
Monday, February 17th, 2025 AT 8:35 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 49,970 POSTS
You can rent a coolant pressure tester which works good for finding leaks. Here is a video that can help:

https://www.youtube.com/watch?v=W8kra65m15c&t

Once the leak is found and after the repairs, please clear the codes and if they come back start a new thread.

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

This guide can help as well. When you find the leak if you need help with the repair, please come back to this thread so we can continue.

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Tuesday, February 18th, 2025 AT 11:43 AM

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