Codes p0355 and p0357, has a coolant leak?

2004 MERCURY GRAND MARQUIS
247,500 MILES • 4.6L • 2WD • AUTOMATIC
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PETPARENT
  • MEMBER
  • 15 POSTS
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.
Feb 17, 2025 at 12:35 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,710 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.

Feb 18, 2025 at 3:43 AM
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