93 Mustang Coolant Leak - Ford Mustang Forum
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post #1 of 23 (permalink) Old 10-12-2013 Thread Starter
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Question 93 Mustang Coolant Leak

From what I've benn told, my heater core is shot.
The car is only driven in warm weather, mainly back and forth to the track for drag racing. So I never use the heat. How do I bypass the heater core, or are there other options besides repalcing it.
It is leaking from the plug in the pic. Located on the passenger side firewall.
Thanks!93 Mustang Coolant Leak-coolant-leak.jpg

1993 GT Mustang / Ford Racing GT-40 Crate Motor B-303 Cam / Tremec T-5Z / 4.30 Gears / Detroit Locker / Moser 31 Spline Axles/ Subframe Connectors / BMR Upper and Lower Control Arms / Lakewood Adjustable Drag Shocks/

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post #2 of 23 (permalink) Old 10-12-2013
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Rigger fix is a loop of hose and tight clamps.
Proper fix is a new core and an intimate relationship with your dashboard.

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post #3 of 23 (permalink) Old 10-12-2013
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To bypass the heater core all you need is a U-shaped hose that attaches to the heater tube with clamps. You'll need to cut about an inch off the one end to make it fit perfectly.

You can find it at Auto Zone OEM: B87629 | Hose (Heater) | AutoZone.com

Napa is another Napa Product Number: NBH10743...and other major auto parts carry that same hose also.
Just ask for the U shaped hose with one end being 5/8" ID and the other end being 3/4" ID.

Last edited by ALMOST STK; 04-19-2015 at 02:23 PM.
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post #4 of 23 (permalink) Old 10-12-2013
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Quote:
Originally Posted by Happytrack 44 View Post
Rigger fix is a loop of hose and tight clamps.
Proper fix is a new core and an intimate relationship with your dashboard.

Everyone seems to be afraid of the "N" word
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post #5 of 23 (permalink) Old 10-12-2013 Thread Starter
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Thanks for the help!

1993 GT Mustang / Ford Racing GT-40 Crate Motor B-303 Cam / Tremec T-5Z / 4.30 Gears / Detroit Locker / Moser 31 Spline Axles/ Subframe Connectors / BMR Upper and Lower Control Arms / Lakewood Adjustable Drag Shocks/

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post #6 of 23 (permalink) Old 10-13-2013 Thread Starter
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Is there going to be coolant flowing out of the lines when I unhook them from the heater core?
Is there a trick to this? I don't want coolant all over my engine and etc....
Thanks

1993 GT Mustang / Ford Racing GT-40 Crate Motor B-303 Cam / Tremec T-5Z / 4.30 Gears / Detroit Locker / Moser 31 Spline Axles/ Subframe Connectors / BMR Upper and Lower Control Arms / Lakewood Adjustable Drag Shocks/

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post #7 of 23 (permalink) Old 10-13-2013
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There will be some coolant leakage when you remove the hoses from the heater tube and heater core. The easiest way to stop that is drain some coolant from the radiator, but there will still be a little in the hoses.
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post #8 of 23 (permalink) Old 10-14-2013 Thread Starter
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Well it's done. Thanks to everyone for all the help. I just put a pan under the passenger side of the car and directed the hoses down when I unhooked them. I got the u-shaped hose from Autozone, cut it to size, and hooked it up. I started it up and watched for leaks.
Then I took it out for a test drive. Everytime I came to a complete stop, coolant would come out of the bottom plug in the pic, pour on the exhaust , and smoke. So I just kept on starting and stopping untill it all came out.
Should I plug the top 2 heater core connections and the bottom plug with something?

1993 GT Mustang / Ford Racing GT-40 Crate Motor B-303 Cam / Tremec T-5Z / 4.30 Gears / Detroit Locker / Moser 31 Spline Axles/ Subframe Connectors / BMR Upper and Lower Control Arms / Lakewood Adjustable Drag Shocks/

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post #9 of 23 (permalink) Old 10-14-2013
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When you replace the heater core,clean out the box very well.And mostly,get a heatercore from Ford,not autozone or napa or elsewhere.


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Quote:
Originally Posted by 93mustang View Post
Well it's done. Thanks to everyone for all the help. I just put a pan under the passenger side of the car and directed the hoses down when I unhooked them. I got the u-shaped hose from Autozone, cut it to size, and hooked it up. I started it up and watched for leaks.
Then I took it out for a test drive. Everytime I came to a complete stop, coolant would come out of the bottom plug in the pic, pour on the exhaust , and smoke. So I just kept on starting and stopping untill it all came out.
Should I plug the top 2 heater core connections and the bottom plug with something?

No reason to plug the inlet or outlet heater core connections sine the heater core is toast already.
Do not plug the lower hole it lets condensation from the A/C out and it's also lets you know that your heater core has gone bad.
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Would it be possible just tocconnect the two hoses with a piece of pipe? As long as there is no kinks obviously.

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Quote:
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Would it be possible just tocconnect the two hoses with a piece of pipe? As long as there is no kinks obviously.
That would work as long as the connecting pipe is 5/8" on one end and 3/4" on the other.. I've heard of people using plastic fittings too connect the inlet and outlet pipe together to make there own heater core delete.
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Definitely get the heater core from the dealership...unfortunately mine was $140. However, I just replaced mine for the 2nd time in 3 years. Should have bought the good one the first time. Live and learn....

When mine went out. I bought a hose connector 5/8" to 3/4" from O'Reillys for $3. it was a plastic one as mentioned above. The damn thing broke about a week later. Guess I got my $3 worth!!! I went to Monument Car Parts and they found an aluminum connector in the AC parts book for $7. Used that one until I was able to get the heater core replaced.

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post #14 of 23 (permalink) Old 10-14-2013 Thread Starter
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Thanks. i wont be replacing the heater core in the near future because like i said, i only use the car for drag racing in the warm weather. The only street driving is back and forth to the the track. If I ever do replace it though, i will definately get a Ford heater core.
So I shouldn't plug the bottom plug even though I'm not going to replace it right now?

1993 GT Mustang / Ford Racing GT-40 Crate Motor B-303 Cam / Tremec T-5Z / 4.30 Gears / Detroit Locker / Moser 31 Spline Axles/ Subframe Connectors / BMR Upper and Lower Control Arms / Lakewood Adjustable Drag Shocks/

Best ¼ Mile Time – 13.08 @ 104mph
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No, no need to plug the bottom drain hole. It did just what it's supposed to do, leak out there instead of inside! Mine did the same.

You don't even need to plug the heater core tubes. Once all the coolant is out of the core, it's just there doing nothing. Just connect the hoses and you should be good to go.

'93 LX 5.0L Hatchback T5
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