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

Overcooling?

  • Thread starter Thread starter 90lxvert13
  • Start date Start date Aug 4, 2007

90lxvert13

Member
Aug 4, 2007
33
0
7
Bristol, CT
Aug 4, 2007
#1
  • Aug 4, 2007
  • #1
Heres the deal, I have a 90 5.0 lx with 47k mi and all stock. The temp gauge shows the car to be running cold, and in the overflow the coolant only rises to about an inch over the cold line. I thought this might be th thermostat so I took it out and tested i na pot of hat water on the stove and it opened and closed fine at 195 degrees. Now I believe it might be either the temp sending unit or maybe the cap. Any ideas?
 

Roland69

Sergeant Tangnet
Sep 17, 2005
2,867
3
58
Port Elgin, Ontario
Aug 4, 2007
#2
  • Aug 4, 2007
  • #2
did you replace the T-stat while it was out...
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
34
129
Aug 4, 2007
#3
  • Aug 4, 2007
  • #3
Welcome to the boards!

Use another means of temperature notation than the stock gauge. It suffers from hysteresis and is just too useless to infer anything from.

Overcooling in this sense is not something to be concerned about.

Good luck.
 

90lxvert13

Member
Aug 4, 2007
33
0
7
Bristol, CT
Aug 4, 2007
#4
  • Aug 4, 2007
  • #4
I put the original t-stat back in b/c it seemed to be fine, heat blows hot .
 

RYC CUKR

Founding Member
May 19, 2002
1,437
1
38
Orlando
Aug 4, 2007
#5
  • Aug 4, 2007
  • #5
Welcome,

As Hissin said the stock gauge is notoriously unreliable. On mine when you turn the lights on it jumps up about a quarter. One of the first mods I would make would be a good set of water temp and oil pressure gauges. I prefer autometer mechanical gauges but their electric gauges are top notch as well.
 

Shakerhood

20+ Year Stangneter
Oct 28, 2004
3,359
209
114
Ohio
Aug 5, 2007
#6
  • Aug 5, 2007
  • #6
Sorry to kinda steal the Thread, but where are you guys tapping the sensor into for an aftermarket water temp gauge?
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
31,179
34
129
Aug 5, 2007
#7
  • Aug 5, 2007
  • #7
Shakerhood said:
Sorry to kinda steal the Thread, but where are you guys tapping the sensor into for an aftermarket water temp gauge?
Click to expand...

Most of us use the stock sender location for the aftermarket piece (since it's in a very desirable spot regarding temp feedback). Then relocate the stocker POS someplace else. I moved the one on the '88 to a dead port on the back of the lower intake. This location isn't great because the flow of coolant back there kinda sucks, but it works fine for the stock gauge. Another option is to buy a chrome or cast t-stat housing and put the stocker there. The downside here is that the chrome ones leak and the cast ones rust. I used the cast unit (10 bucks at AZ) on the 94 and it's fine - paint it before you install it. This option kinda sucks because if the t-stat sticks closed, the gauge won't reflect true motor temps. Again, it probably doesnt really matter because you won't look at the stocker very often.

Yet another option is one Jrichker came up with, where you make a Tee fitting in the heater hose and install a sender there (the principle is similar to an Autometer gauge manifold if one is familiar with those).

Have fun with it E.
 

Shakerhood

20+ Year Stangneter
Oct 28, 2004
3,359
209
114
Ohio
Aug 5, 2007
#8
  • Aug 5, 2007
  • #8
Thanks!!!!
 
You must log in or register to reply here.

Similar threads

Resolved Got Too Hot!!!
  • PonyGTrider
  • Apr 27, 2025
  • Fox 5.0 Mustang Tech
Replies
7
Views
600
Fox 5.0 Mustang Tech May 6, 2025
PonyGTrider
Engine 1990 LX 5.0L EFI Mustang Fuel Management Problems - HELP!
  • 5.0LXStanger
  • May 25, 2025
  • Fox 5.0 Mustang Tech
  • 2 3
Replies
45
Views
2K
Fox 5.0 Mustang Tech Jul 11, 2025
5.0LXStanger
SOLD SOLD!!!! 1993 Notchback Roadracer For Sale. She's a beast!
  • Boydster
  • Apr 25, 2025
  • Fox Body Mustangs For Sale (1979-93)
Replies
0
Views
1K
Fox Body Mustangs For Sale (1979-93) Apr 25, 2025
Boydster
Engine Cooling reservoir questions
  • R82148V
  • Oct 3, 2022
  • Fox 5.0 Mustang Tech
Replies
12
Views
2K
Fox 5.0 Mustang Tech Oct 16, 2022
Mustang5L5
Foxbody issue for 2 years
  • Thepreacher413
  • Oct 3, 2022
  • Fox 5.0 Mustang Tech
Replies
12
Views
2K
Fox 5.0 Mustang Tech Nov 6, 2022
KRUISR
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?