Coolant leaking under glove box. - Page 2 - Vintage Mustang Forums
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post #16 of 23 (permalink) Old 03-07-2019, 01:12 PM
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+ 1 on servicing the motor while you're in there. It'll run faster and produce more flow, too.

Also, suck the heater core dry with a shop vac before you pull the enclosure.
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post #17 of 23 (permalink) Old 03-15-2019, 06:34 AM Thread Starter
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How accurate is this; will the coolant not leak all over my passenger carpet if I have the heater off Cuz that’s what a mechanic told me so I drove it for about 30 min, parked it, got food, when I get back into my car I can see that coolant had been dripping from under dash. Unless I don’t know how to use the damn knobs smh ...?
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post #18 of 23 (permalink) Old 03-15-2019, 06:45 AM
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Originally Posted by Pericos66gt View Post
How accurate is this; will the coolant not leak all over my passenger carpet if I have the heater off Cuz thatís what a mechanic told me so I drove it for about 30 min, parked it, got food, when I get back into my car I can see that coolant had been dripping from under dash. Unless I donít know how to use the damn knobs smh ...?
He's an idiot. Find another mechanic. Pressurized coolant is supplied to the heater at all times.
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post #19 of 23 (permalink) Old 03-16-2019, 07:57 PM Thread Starter
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I tried bypassing the heater core to the intake, but can’t seem to do it without kinking the hose.... will this kink affect driving?!
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post #20 of 23 (permalink) Old 03-16-2019, 08:50 PM
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That kink will put stress on the rubber hose causing it to eventually develop a leak. Probably in a few 100 or 1000 miles.
So you’re good for now.

As an alternative, you can find rubber cap plugs at the auto parts store. And the fitting in the intake manifold can be removed and replaced with a brass plug.

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post #21 of 23 (permalink) Old 03-16-2019, 10:12 PM
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Don't be surprised if your temp gauge goes up a little bit.
I used a couple of bolts that fit in the hose and clamped them. What you have will work for a while, the water doesn't really need to flow, just not leak. A dead end is better.

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post #22 of 23 (permalink) Old 03-30-2019, 03:10 PM
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I'm in the process of rebuilding my heater box. I opted to buy a new Spectra aluminum(Made in China) core. It didn't fit the factory box, I would have had to grind about a 1/4" from the the box to make it fit. I decided to return it and will order a new copper core from NPD. I thought about doing a pressure test on my original core but probably not worth it in the end.
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post #23 of 23 (permalink) Old 03-30-2019, 05:32 PM
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I used the NPD supplied parts when I rebuilt mine (copper core). Everything fit like the OE parts that I removed and the entire unit works better than ever.
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