• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 V6 Mustang Tech

3.8L Radiator Leak

  • Thread starter Thread starter JimmyT1950
  • Start date Start date May 9, 2010
J

JimmyT1950

New Member
May 9, 2010
1
0
0
May 9, 2010
#1
  • May 9, 2010
  • #1
I have a 2003 3.8L mustang with 23,000 miles on it. I've noticed at times, a small bit of water under the front of it in front of the radiator. The other day, my son said when he walked by it, he could hear a hissing sound and water dripping on the ground. When I went to look, the sound had stopped and there was indeed water on the gound. I could not tell what color it was as it had almost evaporated but I assume it was radiator fluid. The strange part was that the vehicle had not been driven for over a day and the ambient temperature was about 65 degrees. I started the vehicle and left it run for a while but it did not leak any fluid.

Any clues as to where this leak might specifically be coming from? I thought maybe it was spraying out of the lower part of the radiator but if that was the case, why didn't it leak when I had run it? The overflow tank still has fluid in it.

TIA,
JimmyT1950
 
A

Aeroman

New Member
Feb 2, 2010
57
1
0
May 10, 2010
#2
  • May 10, 2010
  • #2
Coolant always noticable as green puddle (unless it's the red stuff). Check there is no leak from the top up tank (degas tank).

Air conditioner system is under pressure, also could be pressure in the fuel system. Are they all functioning properly? Next time try & determine what the fluid is, this will narrow the problem right down.
 

wmburns

SN Certified Technician
Aug 14, 2009
5,892
514
204
Houston Texas
May 13, 2010
#3
  • May 13, 2010
  • #3
The AC system frequently makes a sound like gas escaping right after the car is turned off. Further, the low pressure suction line will have condensation on it if the conditions are right (outside temperature humidity).

Suggest setting the coolant level at FULL when the car is cold. Then monitor over a period of time. If it really is leaking coolant, the level will drop.

If you have to know right away, rent a coolant system tester from your local autoparts store.
 
You must log in or register to reply here.

Similar threads

L
Car has been overheating. Not sure what is causing it. Any help would be appreciated.
  • Luckysgirl
  • Jun 2, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
2
Views
89
1996 - 2004 SN95 Mustang -General/Talk- Jun 2, 2026
Luckysgirl
L
M
2001 v6 heater return pipe leak question
  • mnky99
  • Nov 11, 2025
  • SN95 V6 Mustang Tech
Replies
1
Views
238
SN95 V6 Mustang Tech Nov 11, 2025
mnky99
M
2
Electrical mayhem
  • 2000ElectricGreen
  • Mar 13, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
2
Views
249
1996 - 2004 SN95 Mustang -General/Talk- Mar 24, 2026
2000ElectricGreen
2
T
2002 V6 3.8L Help Me
  • TheIncompetentMechanic
  • Apr 4, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • 2 3
Replies
50
Views
744
1996 - 2004 SN95 Mustang -General/Talk- May 12, 2026
TheIncompetentMechanic
T
J
2004 Mustang 3.8L V6 vibrations above 65 MPH and differential leaks
  • joeybuddy96
  • Mar 16, 2026
  • SN95 V6 Mustang Tech
Replies
15
Views
476
SN95 V6 Mustang Tech Jun 28, 2026
joeybuddy96
J
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 V6 Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?