• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

Rad. Cap won't seal *2 new caps*

  • Thread starter Thread starter TheUser
  • Start date Start date Aug 18, 2004
T

TheUser

Active Member
Jul 25, 2003
1,859
1
36
Springfield, MO
Aug 18, 2004
#1
  • Aug 18, 2004
  • #1
My rad cap appears to be leaking; I drive the car and end up w/ coolant on my battery, running out from the headlights and under the hood. I've used 3 different caps, 2 brand new pressure release caps from autozone, and then the stock-style cap from my 90 LX. I'm getting the correct 16 lb cap, and I don't understand this. You can push the cap down a fraction and kinda see that the little tabs on the rad. that hold the cap sealed won't hold it down that far.

Shouldn't the cap be as far down as possible?

The coolant isn't sucking from the overflow to the rad, but if the cap isn't tight enough...that's prob. why. Anyone else ever had this problem? What can I do to fix it besides buy a new radiator?
 

dastang2

Active Member
Dec 11, 2003
2,020
0
46
tx
Aug 18, 2004
#2
  • Aug 18, 2004
  • #2
maybe a warped radiator neck.
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
34
129
Aug 18, 2004
#3
  • Aug 18, 2004
  • #3
yep, sounds like your rad neck is outta whack. stick a machine edge and a caliper on it - i bet you might see some funkiness.

if you want (and the rad is otherwise alright), call a rad shop and see what they charge to fix it. i might not bother - if the neck is like that, how good a shape can the rest of it be in?

good luck bud.
 
You must log in or register to reply here.

Similar threads

Drivetrain 83’ Glx convertible C5 Trans help!
  • JacksonJared2113
  • Dec 25, 2025
  • Fox 5.0 Mustang Tech
Replies
2
Views
383
Fox 5.0 Mustang Tech Dec 26, 2025
JacksonJared2113
S
New misfire after replacing valve seals/springs.
  • SpeedofDarkness
  • Aug 24, 2025
  • SN95 V6 Mustang Tech
Replies
0
Views
195
SN95 V6 Mustang Tech Aug 24, 2025
SpeedofDarkness
S
M
2001 v6 heater return pipe leak question
  • mnky99
  • Nov 11, 2025
  • SN95 V6 Mustang Tech
Replies
1
Views
247
SN95 V6 Mustang Tech Nov 11, 2025
mnky99
M
T
What's it Worth? 2002 GT conv/auto
  • tonydetesta
  • Jan 7, 2026
  • What is it Worth?!?!?
Replies
3
Views
634
What is it Worth?!?!? Jan 21, 2026
Mustang5L5
M
Progress Thread mnky99 2001 V6 evap core, ac compressor, heater core replacement
  • mnky99
  • Sep 5, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
1
Views
494
1996 - 2004 SN95 Mustang -General/Talk- Sep 5, 2025
mnky99
M
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 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?