Antifreeze puddle under passenger side 71 gto - Pontiac GTO Forum
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post #1 of 12 (permalink) Old 07-11-2011, 03:45 PM Thread Starter
 
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Antifreeze puddle under passenger side 71 gto

So I am buying this 71 GTO at the end of the month.. Went over to take an inventory of some parts I need for her and the current owner opened up his garage door for me. Big puddle of antifreeze under the passenger side door and still dripping from what would be under the dash.. The current owner thought heating coil off the top of his head. He is going to put it on the lift this week to investigate and fix.

Meanwhile, I wondered if anyone out there had a guess as to the most probable cause?? possible cure?

Thanks in advance,

Dan
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post #2 of 12 (permalink) Old 07-11-2011, 04:23 PM
 
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Yup! Sounds like a leaking heater core, not that hard to replace. Did it in my GTO in a few hours. Make sure you check the passenger floor for rust and rotting carpet and jute padding if it has been leaking for a while. The only option is to replace it, all of those stop leak in a can products won't work.

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post #3 of 12 (permalink) Old 07-11-2011, 05:19 PM Thread Starter
 
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The GTO was moved the day before so it just happened. Leaked out the bottom. What is the basic repair? I guess this involves yanking off the dash or can you get it it from under the hood? Forgive my ignorance. I don't have the car yet.

I ordered a Chilton's and a Resto guide.

I am Jonesin' to get her back to my house. A few weeks away now.

Dan
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post #4 of 12 (permalink) Old 07-11-2011, 06:30 PM
 
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You gotta take out the glove box, unhook the heater hoses on the engine side of the firewall. Then remove the hvac box from under the dash. The heater core is inside the box. Make sure you take pictures, bag and tag, and mark where lines and cables go. Taking the console and passenger seat out helps too!!

1969 GTO
NUMBERS MATCHING
PAWN SHOP FIND
1947 MGTC
GRANDFATHER STARTED
RESTORATION IN 1980...


"You can have it all, my emipre of dirt. I will let you down, I will make you hurt"
NIN
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post #5 of 12 (permalink) Old 07-12-2011, 09:50 AM
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Not sure on the `71, but some of them you need to remove the inner fender well to get at some of the bolts that hold the heater box on.
If it's not feasible to replace the heater core now, you could by-pass the heater core with the heater hoses at the engine. I ran mine with the heater core by-passed for like 15 years before I restored the car.
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post #6 of 12 (permalink) Old 07-12-2011, 10:50 AM Thread Starter
 
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Thanks for the advice.

So maybe a dumb question, but can you get heat in the car when you bypass that core?

The current owner of the car said depending on what the exact problem was, it could be a real bugger getting to it.

Dan
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post #7 of 12 (permalink) Old 07-12-2011, 11:16 AM
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If you by-pass the heater core you will not get heat in the car.
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post #8 of 12 (permalink) Old 07-12-2011, 11:18 AM
 
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Originally Posted by jigaway View Post
Thanks for the advice.

So maybe a dumb question, but can you get heat in the car when you bypass that core?

The current owner of the car said depending on what the exact problem was, it could be a real bugger getting to it.

Dan
Bypassing the heater core = zero heat. Sorry to give you the bad news. BUT I think it's a doable job even for a rookie. You have the manuals coming. Ask the owner to take some money off the selling price ... bypass the heater core ... drive it home and tear into it. YOU CAN DO EEET!
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post #9 of 12 (permalink) Old 07-12-2011, 11:56 AM
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Mine has never been hooked up. In my case, bypassing the heater core is a good thing. I get too much heat coming thru the firewall and the floor pans as it is. Need a heat barrier..



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post #10 of 12 (permalink) Old 08-14-2011, 09:57 AM Thread Starter
 
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Done with changing the Heater Core on my 71. Not as bad as I thought it was going to be. About 3-4 hours and some scraped knuckles. Not as easy as Chilton's makes it out to be either! Thought I would update this thread to offer my assistance in the future for any questions involving an HC swap.

Dan
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