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

coolant coming from firewall/waterpump noises

  • Thread starter Thread starter jmd2914
  • Start date Start date Jun 5, 2006
J

jmd2914

Founding Member
Sep 6, 2002
937
0
0
Napa, California
Jun 5, 2006
#1
  • Jun 5, 2006
  • #1
i took out my ac and all the hoses a while ago and now i have coolant leaking out of my firewall every once in a while. where is it coming from? also im starting to have cooling issues and my water pump is starting to whine. does this mean its going bad? ( noob question)
 
D

Daggar

New Member
Jul 19, 2004
3,902
5
0
Jun 5, 2006
#2
  • Jun 5, 2006
  • #2
Is your heater core gone as well?


Change the water pump. It's a relatively simple job to do and will remove all doubt.

Swap your thermostat while you're at it. I'm in the habit of boiling every new stat to ensure it opens up at the proper temp prior to installation.
 

Bolt on 5.0

Founding Member
Jun 26, 2002
302
0
17
Suffolk, NY
Jun 5, 2006
#3
  • Jun 5, 2006
  • #3
yeh, on the firewall the are 2 lines for the heatercore. I could be bypassed as implied by dagger above. Eather way, check the hoses and clamps back there, you should find that to be the problem.
 

srothfuss

Last night I stabbed the same guy 7 times in a row
Oct 17, 2004
1,796
3
0
Woodward Ave.
Jun 5, 2006
#4
  • Jun 5, 2006
  • #4
I "think" what Daggs was saying is that if the heater core lines are just left unpluged, the remaining coolant [from inside the heater core] is sloshing around and spilling out when he applies the brakes or takes a hard corner.

Remove the heater core or plug the lines.
 

Sarge2155

Member
Dec 17, 2002
38
0
6
Arlington, Texas
Jun 5, 2006
#5
  • Jun 5, 2006
  • #5
Yeah you also have an A/C drainage port / hole there (at the firewall passenger side) and sometimes coolant from the heater core will leak out of the drainage hole. I might add that replacing the heater core is a nasty job (not dirty nasty just friggin nasty.
 
J

jmd2914

Founding Member
Sep 6, 2002
937
0
0
Napa, California
Jun 5, 2006
#6
  • Jun 5, 2006
  • #6
i still have my heater core in the car, the hole that is leaking is on the passenger side from where i unhooked one of the a/c hoses so im not sure if that is connected to the heater core, i replaced the water pump about six months ago, should i be going through waterpumps that fast? what deg thermostat should i go with?
 
D

Daggar

New Member
Jul 19, 2004
3,902
5
0
Jun 5, 2006
#7
  • Jun 5, 2006
  • #7
The hole that you mention. Does it come through the firewall? If so, that's the drain hole from the air box that I think someone mentioned above. Chances are, that your heater core is leaking beneath the dash and is draining into the air box.

No, you should not be going through water pumps that fast but it has been known to happen before.

A 180* T-stat is the best over-all performer for fuel injected Fox bodies.
 
J

jmd2914

Founding Member
Sep 6, 2002
937
0
0
Napa, California
Jun 5, 2006
#8
  • Jun 5, 2006
  • #8
hmm alright, where can i pick up a 180*t-stat? local parts store? also does anyone have a good wiring diagram for a taurus fan?
 
J

jmd2914

Founding Member
Sep 6, 2002
937
0
0
Napa, California
Jun 5, 2006
#9
  • Jun 5, 2006
  • #9
also, should i plug that hole in the firewall or no?
 

bill302

Active Member
Nov 2, 2005
2,131
1
46
alabama,gadsden
Jun 5, 2006
#10
  • Jun 5, 2006
  • #10
no your air box will fill up and overflow into interior carpet....and is the fluid exiting this port coolant....do you have air conditioning? because 2 types of fluid exit this port coolant if the heater core is bad and water condensation from the air conditioning evaporator located beside the heater core...
 

Roland69

Sergeant Tangnet
Sep 17, 2005
2,867
2
58
Port Elgin, Ontario
Jun 6, 2006
#11
  • Jun 6, 2006
  • #11
that's the weep hole I posted a while back I even posted a pic of it. Mine did the same thing I bypassed the H/C for now and I think since I don't have A/C I have a pretty simple core change..............I hope anyway
 
J

jmd2914

Founding Member
Sep 6, 2002
937
0
0
Napa, California
Jun 6, 2006
#12
  • Jun 6, 2006
  • #12
i used to have a/c i yanked it out of the car a while back. and its coolant coming out of the hole.
 
D

Daggar

New Member
Jul 19, 2004
3,902
5
0
Jun 6, 2006
#13
  • Jun 6, 2006
  • #13
All the more reason to bypass or replace that leaking heater core!

Do NOT plug that hole coming through the firewall. Better that stuff leaks into the engine baythan your passenger floor area. hehe
 
J

jmd2914

Founding Member
Sep 6, 2002
937
0
0
Napa, California
Jun 7, 2006
#14
  • Jun 7, 2006
  • #14
true, thats probably a good reason not to plug the hole. how hard it is to replace a heater core?
 
You must log in or register to reply here.

Similar threads

Engine Coolant boiling in hose?
  • Teen'93stang5.0
  • Jun 3, 2026
  • Fox 5.0 Mustang Tech
Replies
7
Views
146
Fox 5.0 Mustang Tech Jun 8, 2026
Mustang5L5
K
86 GT Water Pump
  • Kade5114
  • May 11, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
3
Views
84
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 11, 2026
nickyb
G
1991 GT 5.0 running hot
  • gvanginkel403
  • Jul 1, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
5
Views
115
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jul 2, 2026
General karthief
V
Engine Coolant Leaking?
  • vinzo
  • Jan 26, 2025
  • Fox 5.0 Mustang Tech
Replies
7
Views
471
Fox 5.0 Mustang Tech Jan 26, 2025
2000xp8
S
Drivetrain Downshifting from 3rd to 2nd issue
  • Scott_S
  • Apr 23, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
24
Views
686
Fox 5.0 Mustang Tech Jun 14, 2026
Mindseye007
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?