Question about 2005 Ford Mustang

1 Answer

I have a coolant leak in my 2005 Ford Mustang from behind the thermostat. What is causing this?

Posted by on

  • 2 more comments 
  • cheris_hodge May 09, 2009

    The engine Thermostat.

  • cheris_hodge May 09, 2009

    The thermostat was replaced, but the leak is still happening. It's behind the thermostat where the leak is. Could it be the water pump?

  • Mike Wine May 11, 2010

    meaning the leak is coming from where the thermostat is located??? possilby bad seal with the thermostat. I would pull and replace, especially if you know that that is where the leak is coming from.

  • May 11, 2010

    You mean the engine thermostat or the interior A/C thermostat?



1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

I just had this happen to me we had to replaced the whole thermostat housing because its plastic it cracked no explanation why but the crack was in the very back leaking down towards the waterpump .

Posted on May 24, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Coolant leaking from 1998 ford mustang

If you have coolant leaking from the top of your engine then you have either a bad hose or your thermostat housing is leaking and requires a new gasket. Either one is an easy fix for anyone with even basic mechanical knowledge. Just ask your local parts shop to point out the problem to you.

Mar 31, 2014 | 1998 Ford Mustang

2 Answers

Leak in my 2005 mustang in passenger floorboard

Is it leaking engine coolant or only when it rains on the car. If it is engine coolant. you need to replace your heater core...

Feb 12, 2014 | 2005 Ford Mustang

2 Answers

Excelerated my Mustang real fast to get into moving traffic. Then smelled coolant. When I pulled into a store to get gas 4 miles later the car was smoking. Left a trail of some liquid behind me. Checked...

You will need to jack the car up to get under it. Once it is jacked up you must be sure to put jack stands under it for your safety. Please - no car is worth your life.
After you secure the car. Get under it with a flash light and have some one start it and put water in it. Look for the water coming out. You may have blown a hose or a freeze plug. If it is a hose - replace as needed. If it is ANYTHING else please have a professional look at it as you are obviously unable to repair it and the tools alone will cost more than a mechanic in many instances.

Jun 13, 2010 | 2005 Ford Mustang

1 Answer

The upper radiator hose on my 96 Mustang GT is not pumping coolant into the intake manifold, it seems that there is alot of pressure in the hose?

The thermostat is behind here. The hose goes to thermostat-housing which is on top of thermostat on the intake. The thermostat is not opening.

Nov 11, 2009 | 1996 Ford Mustang

1 Answer

Overheating and no ac , replaced coolant fan didnt help

Headgasket may be blown. Try using the Goop found at local auto centre "Liquid Coolant Sealant"
Issue you are having is carbons leaking into the coolant tank is causing additional "BOIL" almost like blowing extremely hot air into water... Causing it to boil.
Your A/C is alone part of your Blower Fan, a completely different element to the cooling system, and you will need to recharge your AC
Try the goop. It really does work!!

Aug 25, 2009 | 2005 Ford Mustang

2 Answers

1998 mustang gt coolant leak

I just had the same problem. Ford design the intake manifold with plastic water crossover which cracks. The coolant will leak onto the top of the block and and then down the back of the engine. This intake design is a known defect and was ocvered under by Ford for 7 years past the date of mfg. The crack either is in the crossover or the thermostat housing. I happed on this when I found the same leak and traced it back to the thermostat housing. I changed the thermostat, but it leaked worse. You can pickup a aftermarket for $200 and it's about 4-6 hr job to replace.

Oct 18, 2008 | 1998 Ford Mustang

1 Answer

Leaking coolant

i believe this part you are referring to is the intake manifold. it seems to be a big problem with the older ford mustangs. make sure before you spend the big bucks on it that it's not just the water pump gasket.

Jun 06, 2008 | 1994 Ford Mustang

Not finding what you are looking for?
2005 Ford Mustang Logo

Related Topics:

1,138 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

76846 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers


Level 3 Expert

5546 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides