Ford Mustang Forum banner

The coolant leak I can't find the source of

722 Views 4 Replies 4 Participants Last post by  SimplyMarkB
My 2009 Mustang GT 4.6 l V8 is losing coolant bad. If I were to fill it up right now it would be empty after driving about 2 miles. I've been trying to trace the source of the leak and couldn't find it. I looked in the standard places such as the radiator area or possibly a line with no luck. I put the car up on jacks ran the engine and it appears to be coming down near the back of the oil pan. And before anyone says any smart alec remarks I know it's not coming out of the oil pan 馃槀馃槀馃槀 but it's running down from up top somewhere and I have no idea where. I made a YouTube video of it. Maybe someone can offer suggestion of what I should look for. Here's the link:
See less See more
  • Like
Reactions: 1
1 - 5 of 5 Posts
More than likely the coolant lines under the intake. Not my video, but this will show you where it is. I don't agree with how they fixed it in the video, I would just do it correct with new parts. Pulling the intake on the 3v is very easy.

  • Like
  • Helpful
Reactions: 3
More than likely the coolant lines under the intake.
I'd say definitely!
  • Like
Reactions: 2
Yep. The 90掳 connector on the heater tube assembly under the intake has most likely cracked due to age. Mine did bout 5 years ago. There is a drain hole at the back of the intake valley to allow water/coolant to drain out. (See pic). It's a much easier repair to remove the intake manifold. If you're on a budget, you can buy a Motorcraft or Dorman connector, remove the crimp clamp like in the video, and clamp on the replacement. Do not cut the hose. It will be too short after. But most likely, the heater hoses are due for replacement anyway.

Here's the Motorcraft/Dorman part:

Here's the heater tube assembly:

and heater hoses:

You'll also need to replace the O-rings on the nipple/tube that the metal heater tube presses on to on the back of the water pump.(See pic). The nipple is pressed in to the engine block behind the water pump. Once you have the heater tube assembly off, remove the 2 O-rings, and match them up at your local hardware store or you can buy the Dorman nipple and take the O-rings off and put them on your existing nipple.

Removing the intake manifold will most likely also require new intake gaskets & injector O-rings:

A pair of remote hose clamp pliers will also come in handy.

And Motorcraft Coolant (I prefer the 50/50 pre-mixed):

Attachments

See less See more
2
  • Like
Reactions: 2
Hey everybody. You were all right on point! It was the heater hose. I am heading to O'Reilly to pick up a replacement right now! Thanks for the help!!! Look at the video:
  • Like
Reactions: 5
1 - 5 of 5 Posts
Top