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  Mustangsandmore Forum Archive
  '64 1/2 to '68 1/2 -- The Classic Mustang
  coolant leaking inside

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Author Topic:   coolant leaking inside
masterrh
Journeyman

Posts: 70
From:
Registered: Jul 2004

posted 08-03-2005 09:12 PM     Click Here to See the Profile for masterrh        Reply w/Quote
thanks for the help so far, but the problems never seem to end. I was driving down to school and I noticed coolant started to leak inside from the blower box(?)(On the passanger side its dripping on the floor mat) . I'm thinking that this might have happened because I use a cup as an overflow container and before I left I filled it up really high and the back pressure might have forced leaking through the heater core (note the cup did not have a lid on it). The car drove fine, it did not overheat ninety miles trip toward my destination and not sure why it's leaking or if that is the correct problem. Any comments or suggestions would be appreciated.

------------------
Masters

1966 289 4spd 'R3D 5'
http://www.cardomain.com/ride/639289/6

W/optional accessories. :)

sigtauenus
Gearhead

Posts: 3969
From: Va Beach
Registered: Jun 2000

posted 08-03-2005 09:19 PM     Click Here to See the Profile for sigtauenus        Reply w/Quote
I don't think it would be the overflow cup, probably just time for a new heater core.

JAAZZY
Gearhead

Posts: 918
From: Bay Area, CA
Registered: Apr 2001

posted 08-03-2005 09:26 PM     Click Here to See the Profile for JAAZZY        Reply w/Quote
I second the heater core. I always had problems with it. Since I just drive the car on nice days I disconnected it. There is apparently a diverter available that cuts the flow pressure and thus the core lasts longer.

kcode
Gearhead

Posts: 3415
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99

posted 08-03-2005 09:34 PM     Click Here to See the Profile for kcode        Reply w/Quote
I agree with the blown heater core. If you are lucky it might only be the hose connections to the core...loose clamps maybe.

Mike

rmousir
Gearhead

Posts: 1124
From: Amelia, Ohio
Registered: May 2003

posted 08-03-2005 09:40 PM     Click Here to See the Profile for rmousir        Reply w/Quote
heater core for sure. good time to rebuild the blower box and add new heater hoses. Or if you are looking for a different option you can just re route your heater hose and not use the heater core.

Cheers
Richard.

Scott H
Gearhead

Posts: 1480
From: Chicago area
Registered: Mar 2005

posted 08-03-2005 10:23 PM     Click Here to See the Profile for Scott H        Reply w/Quote
Since you wouldn't be needing the heater for the next couple months and If I recall you have a long trip coming up, I would by-pass the heater core for now and spend time and $$ fixing it when you return.

johnmustang
Gearhead

Posts: 6748
From: British Columbia , Canada
Registered: Nov 2001

posted 08-03-2005 10:30 PM     Click Here to See the Profile for johnmustang        Reply w/Quote
Yup, sounds like your heater core is pooched, one way to find out is to run the car and then turn on your heater, if it smells like anti freeze and the windshield starts to fog up then you know 100% that it is the core. You really do not have to do that though, based on what you have said it is the core that is pooched. Just swap it out for another one, they are easy to change, just take your time when you do it and if you still have your original heater plenum (cardboard if it is) swap it out for a plastic one and you are good to go.

------------------
JOHN
65 FASTBACK 2+2
87 TAURUS WAGON
03 F150 XLT SUPER CREW 4X4 SHORT BOX
Member: PACIFIC COAST MUSTANG ASSOCIATION
Member:Vancouver Island Mustang Association
M&M #1710
65 FASTBACK
2003 F150 XLT SUPER CREW 4X4

Mike W
Gearhead

Posts: 135
From: CA
Registered: Jul 2003

posted 08-04-2005 01:45 AM     Click Here to See the Profile for Mike W        Reply w/Quote
I like to put a valve on the intake manifold connection and shut off the water during the summer.

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