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how do you fix a leeking rad? Answered

my heater core is leeking?

Tags:car

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Re-design
Re-design

Best Answer 11 years ago

Just had a thought.  Do you need heat? Don't have an idea where you live but if you can do without heat you can take off the hoses and couple them together and bypass the leaking core.  My '75 Chevy van did that to me and I ran it almost a year before I got cold enough to pay for a repair.

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Burf
Burf

11 years ago

Assuming that the leak is not from a hose or fitting and that the core is aluminum (which is almost a certainty on newer vehicles) the cheapest way to go is to pull the core and take it to a shop for repair or buy a re-manufactured core. 
Stop-leak radiator additives are, at best, temporary solutions.

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seandogue
seandogue

Answer 11 years ago

Couldn't agree more. I've swapped four cores in my time, and I tried fixing two of them before soaking my carpeting, spending one winter without heat and a floor that was ice covered, (I had to bypass it because it got worse after the repair and it was just too cold to work on it anymore), and having to bust the system open anyway to replace the core.

The worst one was one a 67 cougar I had partially restored...had to pull the dash to replace. TG new models usually have a panel on the inside of the firewall.

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NachoMahma
NachoMahma

11 years ago

.  Are you sure it's the heater core that is leaking? It may be one of the hoses, especially where they connect to the core.
.  If it is the core, then, as Re-design says, that's a job for a pro.
.  If it's a hose, then you should be able to buy replacements at just about any auto supply.

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seandogue
seandogue

11 years ago

 heater core?  bummer.

as re-design said, although ime it's best to pay the piper, pull the unit, and swap it and some cash for a new or rebuilt.

Been there tried that, discovered it's not worth pissing around twice in the middle of the winter.

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Re-design
Re-design

11 years ago

Can you get it out?  If so then take it to a radiator shop and let them solder it if they can.  You an try but you'll need a torch and flux and solder.

There are some liquids that you can pour in the radiator and sometimes they will plug a small leak.

Look up "liquid glass"  sometimes that works also.