Making a hissing noise, like a flat tire?

Tiny
DJDESHHAY80
  • MEMBER
  • 2016 LINCOLN MKX
  • 0.5L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 151,586 MILES
It's not overheating, and I don't see any fluids on the ground. Any thoughts?
Saturday, July 8th, 2023 AT 6:15 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,816 POSTS
Hi,

Could the sound be coming from the exhaust? A partially clogged catalytic converter can do this.

Can you tell where approximately the sound comes from? Is it loud enough for you to record and upload for me to hear? Is the A/C working properly?

Let me know.

Joe
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Saturday, July 8th, 2023 AT 11:27 PM
Tiny
DJDESHHAY80
  • MEMBER
  • 3 POSTS
Thanks Joe, as I'm facing the car it sounded like it was coming from the right side and a funny smell, my son says it smells like a gocart? I don't hear the noise today, but the smell is still there, and my A/C is not cold like it was yesterday?
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Sunday, July 9th, 2023 AT 6:22 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,816 POSTS
Hi,

How would you best describe the smell? A go-cart can make many different smells, so I'm not sure what to suspect.

Does it smell like rubber burning, something electrical, or does it have a sweet smell to it? Since the A/C isn't working as it did, I'm questioning if you have a belt slipping causing a burnt rubber smell.

It's one thing to ask for a pic of something or the audio of a sound, but I haven't figured out how to have a smell sent. LOL

Take care of yourself,

Joe
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Sunday, July 9th, 2023 AT 7:13 PM
Tiny
DJDESHHAY80
  • MEMBER
  • 3 POSTS
Lol! Very true it's kind of a sweet smell. Not burning or electrical.
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Sunday, July 9th, 2023 AT 7:49 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,816 POSTS
Hi,

If it has a sweet smell, that is usually coolant. Check the coolant level to make sure it is full. If it isn't, I recommend pressure testing the system to see if you can recreate the sound. You will need a pressure tester, but most parts stores will lend one to you.

Here is a link that explains how it's done:
https://www.2carpros.com/articles/radiator-pressure-test

This is done when the engine is cold, so it is easier to check things without getting burned. LOL

Let me know what you find or if you have questions.
Take care,

Joe
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Monday, July 10th, 2023 AT 8:59 PM

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