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Coolant leak

Tiny
DIVIDES
  • MEMBER
  • 2007 FORD MUSTANG
  • V8
  • 2WD
  • MANUAL
  • 177,000 MILES
What can leak under the intake of these v8 engines? It just developed a leak. Once it gets to optimum temperature, I see a leak coming from the back of the motor, and I looked under the intake, and I see some rust and some water from that leak.
Friday, December 31st, 2021 AT 1:34 PM

19 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
Hi,

I suspect you have the 4.6L V8. There is a coolant cross-over on the rear of the engine that can be leaking.

If you look at pic 1 below, I highlighted the cross-over and circled all the places that could leak. Check those areas first.

If you find it needs to be removed to fix the leak, pics 2 and 3 provide the directions. You will also need to remove the intake manifold.

Let me know what you find or if you have questions.

Take care,

Joe

See pics below. Note: If you have a 5.4L, let me know.
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Friday, December 31st, 2021 AT 11:38 PM
Tiny
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So, most videos show the two hose change, which is easy unclip and remove the bolt. What about the steep one on bottom how is that changed?
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Thursday, January 6th, 2022 AT 7:25 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
Hi,

I attached a pic below. Is that the one you are referring to, the heater supply hose? If it is, that is a quick connection. Gently push in on the connector and remove the push pin I circled. Then, pull it off.

Be careful removing it because there is a rubber O-ring in the connector. If it gets damaged, it will leak.

Let me know if this helps.

Joe

See pic below.
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Thursday, January 6th, 2022 AT 9:16 PM
Tiny
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Yes, this is one of them, they are usually sold in pair. It is the other one I am talking about, all metal under the intake and is lower in placement.
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Friday, January 7th, 2022 AT 5:30 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
If I understand, you need to know how the steel end connects? Is that correct? If so, on the opposite end, there will be a similar quick connector. It works the same as the first one I mentioned.

Let me know if that is what you are referring to.

Joe
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Friday, January 7th, 2022 AT 6:00 PM
Tiny
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No, I mean the other hose that is partially metal on the bottom of this connector, it's a ling on.
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Friday, January 7th, 2022 AT 6:46 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
Hi,

Could you take a pic of the hose you are indicating and upload it? I'm not sure what you are referring to. Also, I'm not sure what you mean by ling on.

Let me know.

Joe
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Friday, January 7th, 2022 AT 10:01 PM
Tiny
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This hose to the left which comes with the other hose, where does it connect? It's mostly metal. It lies down on the bottom underneath the other one a d connects from front to back.
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Saturday, January 8th, 2022 AT 6:16 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

One is a heater return and the other is the heater supply hose. It goes from the heater core under the intake and to the back of the water pump.

Joe
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Saturday, January 8th, 2022 AT 11:16 PM
Tiny
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Yes, that is it. Is there an o ring where it attaches behind the water pump? Couldn't find anyone replacing it and how to remove it.
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Sunday, January 9th, 2022 AT 6:42 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
Hi,

On one end will be a quick connection. On the opposite side, there is an o-ring. That portion is at the rear of the water pump. Before you install the new o-ring, make sure to lubricate it with coolant. That hose will then be bolted into place.

Take care and let me know if you have other questions.

Joe
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Sunday, January 9th, 2022 AT 5:52 PM
Tiny
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Got it out. Looks like the back of water pump that connects to lower metal pipe has 2 o rings, can you find out what is the part number?
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Monday, January 10th, 2022 AT 12:56 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
Hi,

Yep, there are two. If you look at the pic below, I attached a pic and the part number. The part number, W704593-S100, is a Ford part number. I'm sure you can find one that works the same in a different brand and for less money.

I hope this helps.

Take care,

Joe

See pic below. Note: I just picked the first Ford dealership that came up to show you. Neither 2CarPros nor I have anything to do with them. In other words, I'm not trying to make money. LOL
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Monday, January 10th, 2022 AT 4:06 PM
Tiny
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Lol, thanks. What is this here that I see whenever I search for it?
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Monday, January 10th, 2022 AT 4:19 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

That appears to be the receiver of the hose you are replacing. Do you recall seeing it when you removed the old hose?

Joe
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Monday, January 10th, 2022 AT 8:58 PM
Tiny
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You mean the receiver from behind the water pump? If so, only partially cause the bigger part is still behind the water pump and in front of the block.
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Tuesday, January 11th, 2022 AT 2:51 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,310 POSTS
If possible, could you take a pic of what you are seeing and upload it for me to see? It would help me. Also, the pic you provided will be on the opposite side of the replacement tube.

Let me know.

Joe
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Tuesday, January 11th, 2022 AT 7:10 PM
Tiny
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I see where it goes, water pump has to be removed, I won't need to I just wanted the right size o rings as no one seems to have it and many are different sizes. They fir right. Thanks for your help.
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Tuesday, January 11th, 2022 AT 7:12 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

You are very welcome. If possible, let me know how things turn out for you or if you need help with anything.

Take care,

Joe
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Tuesday, January 11th, 2022 AT 8:33 PM

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