• Mustang Forums
  • 2005 - 2014 S-197 Mustang -General/Talk-
  • 2005 - 2009 Specific Tech

Can't drain coolant 100%

  • Thread starter Thread starter gerryha
  • Start date Start date Oct 12, 2020
G

gerryha

New Member
Oct 10, 2020
1
0
1
Victoria
Oct 12, 2020
#1
  • Oct 12, 2020
  • #1
I wanted to replace the coolant in my 2005 Mustang GT - but I can't get all the old coolant out. A lot of research, and it's like no one else has this issue. The car takes something like 15 quarts but I can only get maybe 5 out at a time. American Muscle briefly states:

"The proper way to flush the system is to make multiple passes through the system with distilled water. Once the fluid becomes clear and appears to be completely water, the system can be replaced with the coolant of choice"

But how can I replace the water will coolant if I can only get 5 quarts out at a time, it is supposed to be 7.5 quarts of coolant. Strange how so many how-to guides don't seem to go into enough detail to properly cover this problem.
 

Dino Dino Bambino

15 Year Member
Jun 13, 2007
1,673
90
79
Cyprus
Oct 13, 2020
#2
  • Oct 13, 2020
  • #2
If you only open the radiator petcock you might only drain about 5L. Try removing the lower radiator hose as well.
 
You must log in or register to reply here.

Similar threads

M
2001 v6 heater return pipe leak question
  • mnky99
  • Nov 11, 2025
  • SN95 V6 Mustang Tech
Replies
1
Views
385
SN95 V6 Mustang Tech Nov 11, 2025
mnky99
M
A
Resolved 302 oil leak when running
  • AlexM556
  • Sep 8, 2026
  • Classic Mustang Specific Tech
  • 2
Replies
36
Views
1K
Classic Mustang Specific Tech Nov 1, 2026
manicmechanic007
F
Fox 1990 Mustang GT 5.0 A9L – Engine suddenly shuts off but immediately restarts when key turned
  • FishermansFriend
  • Aug 9, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
16
Views
661
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Aug 30, 2026
General karthief
I
Engine Help requested in identifying how to resolve engine light issue
  • Ianslaney
  • Oct 4, 2026
  • SN95 4.6L Mustang Tech
Replies
1
Views
174
SN95 4.6L Mustang Tech Oct 4, 2026
Bullitt347
Engine Re-torquing intake manifold bolts question
  • 91GTstroked
  • Feb 22, 2025
  • Fox 5.0 Mustang Tech
Replies
6
Views
1K
Fox 5.0 Mustang Tech Mar 1, 2025
Jarhead67
J
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 2005 - 2014 S-197 Mustang -General/Talk-
  • 2005 - 2009 Specific 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?