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

heater core bypass

  • Thread starter Thread starter dre2013
  • Start date Start date Jul 8, 2009
D

dre2013

New Member
Jun 13, 2004
12
0
1
Jul 8, 2009
#1
  • Jul 8, 2009
  • #1
bought an 87 gt yesterday..306 crate motor, trickflow intake mani, heads, cam, etc..a/c deleted. car runs great but last night after a WOT run i pulled into my driveway and was greeted with white smoke from under the hood. turns out its leaking from the heater core drain. This car won't be getting driven in the winter so i want to just bypass it for now. anyone have any pics of what to do? i did a search but couldnt find any pics.

its coming from the black grommet looking thing towards the bottom of the firewall
View attachment 252069
 

f8tlfiveo

My wife likes my spool and blow-off valve.
Aug 8, 2007
1,585
102
64
Lancaster, PA
Jul 10, 2009
#2
  • Jul 10, 2009
  • #2
The heater core shouldn't have a drain on it. To bypass your heatercore all you need to do is pull the hoses off the heatercore and look for a way to connect the two hoses together so it doesent flow through the heater core. I would go to the parts store and look for a hose to connect the two metal lines that are mounted on the intake
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,162
17,856
224
Massachusetts
Jul 10, 2009
#3
  • Jul 10, 2009
  • #3
The drain is the A/C water runoff drain. When the core blows, coolant runs out here too.

I think parts stores sell a heater core bypass kit which is just a hose nipple and two clamps
 
You must log in or register to reply here.

Similar threads

D
Engine Coolant and Radio Issues
  • Don7Up
  • Sep 14, 2025
  • Fox 5.0 Mustang Tech
Replies
17
Views
563
Fox 5.0 Mustang Tech Oct 4, 2025
Don7Up
D
M
2001 evap/heater core questions
  • mnky99
  • Sep 3, 2025
  • SN95 V6 Mustang Tech
Replies
3
Views
277
SN95 V6 Mustang Tech Sep 3, 2025
mnky99
M
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
424
1996 - 2004 SN95 Mustang -General/Talk- Sep 5, 2025
mnky99
M
M
  • Locked
2001 evap core tube support
  • mnky99
  • Sep 4, 2025
  • SN95 V6 Mustang Tech
Replies
4
Views
318
SN95 V6 Mustang Tech Sep 5, 2025
mnky99
M
M
2001 v6 heater hose quick connect question
  • mnky99
  • Sep 24, 2025
  • SN95 V6 Mustang Tech
Replies
8
Views
460
SN95 V6 Mustang Tech Sep 26, 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?