1988 Ford Bronco leak on back of heater core

Tiny
BRYSON829
  • MEMBER
  • 1988 FORD BRONCO
  • 6 CYL
  • 2WD
  • MANUAL
  • 110,000 MILES
My vehicle is a 1988 bronco II

all my coolant from the radiator is leaking out.
its coming from a plug in the back of the heater core
or the under side of it.
when you look under the fender well or take the inner fender out, you can see the coolant leaking out, and fast.
it seems like im missing a hose but I dont think a hose goes there.
or mabe a plug stopper of some type.

can you help me fix my problem?
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Saturday, August 9th, 2008 AT 7:41 AM

7 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Is the leak comming from the engine block? If yes it could be a freeze plug, punch the rest of it and pull it out, get a new plug and rent the freeze plug installer tool and install the new one. Inspect the others for any sign of corrosion, or weeping, and replace those as well.
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Saturday, August 9th, 2008 AT 7:49 AM
Tiny
BRYSON829
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No its not a freeze plug
i know that much
cause its not on the block

i dont know what it is
its close to the firewall though
and like I said I think its on the side of the heater core or something
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Saturday, August 9th, 2008 AT 11:47 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Can you post up a picture for me?
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Saturday, August 9th, 2008 AT 11:53 AM
Tiny
BRYSON829
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  • 3 POSTS
I wish I could but I cant
umm

i just know that on the passenger side of the vehicle the right is the a/c
then two lines
and the the heater core correct?
Where the heater core connects to the firewall
on the bottom side of it is where its leaking

another question is the vehicle sputters while im driving
the distrubutor cap was loose so it might of threw off the timing but I dont know how to check it

or do you think its fowled injectors?
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Saturday, August 9th, 2008 AT 12:25 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
HEATER SYSTEM -1988 Ford Bronco II
Page 1 of 1
Removal & Installation (Bronco II & Ranger)
Drain coolant from radiator. Disconnect heater hoses from heater core and plug openings. Remove 5 screws from heater core access cover on plenum assembly. Remove access cover. Pull heater core rearward and down, removing from plenum. To install, reverse removal procedure.

8/9/2008
You have checked the coolant level? And this leak is antifreeze?
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Saturday, August 9th, 2008 AT 7:23 PM
Tiny
BRYSON829
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  • 3 POSTS
So your saying my plenum is bad?

And yes the coolant in the radiator is leaking out
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Saturday, August 9th, 2008 AT 8:23 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
No, these are the instructions to R & R the heater core.
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Sunday, August 10th, 2008 AT 7:57 AM

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