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Unread 07-21-2011, 11:54 PM   #1
94YJ4L
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1994 YJ Wrangler 
 
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Radiator Leak

I have the stock radiator on my 4.0. On hot days, or after running on trip of more than 30 miles, I can smell the antifreeze. After about a week, I have to put more antifreeze into it. I have looked all over the engine and found nothing. No water in the oil BTW.

One day, I noticed that when I run it for about 30 minutes or so, it's "leaking" at the overflow spigot on the top of the radiator. As it's stock, it has the plastic cap for the top of the radiator. Is there a way to fix this or am I destined to buy a new radiator. Doesn't seem to overheat, at least not by the temp gauge. But it does seem to get louder as it looses enough coolant.

My heater doesn't blow hot air, BTW. No water/coolant in the cab. Probably a clogged heater core.
Really at a loss. Can't use Gorrilla on it as the bottle says, "not for use on plastic".

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Unread 07-22-2011, 12:13 AM   #2
Xpress
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Try a new radiator cap first.

I had 3 problems with mine:

-Lack of thermostat
-Bad water pump
-Bad radiator cap

I fixed all of those things and it ran at operating temperature and my heater started to put out lots of heat.
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Unread 07-22-2011, 01:02 AM   #3
94YJ4L
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Already tried the cap. no change...will look at the thermo and the pump. Would taking off the return line from the heater show if anything is coming out?
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Unread 07-22-2011, 04:32 AM   #4
hdsport
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More info, please

OK, so can you tell us exactly where the leak is? Is it at the interface between the plastic "cap" and the core OR is it the Radiator cap?
Advise, please.
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Unread 07-22-2011, 11:24 AM   #5
94YJ4L
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Looks to be at the cap, where the overflow tube connects to the neck. Also, the resevoir is full, so it doesn't look like it's drawing from it like it should
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Unread 07-22-2011, 11:36 AM   #6
jbolty
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Pretty common for cracks to develop in thos eplastic radiators. Unless it overheats there will probably not be a leaking gusher but it will not build preassue like it should and instead of pulling coolant from the overflow it may suck air thru the crack.

If you can find and confirm the crack a new radiator is in your future. Before you swap it flush, flush and back flush a few times to get the crud out of the whole system and see if the heater core is bad. You don't want to flush with the new radiator already installed because then the gunk from the block and heater core will mess up the shiny new rad.

Personaly I would replace the waterpump, belts, hoses and thermostat all at the same time and be trouble free for years.
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Unread 07-22-2011, 11:38 AM   #7
94YJ4L
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Thanks for the advice...this will go on the list of things to do, along with timing chain, clutch, slave cylinder, and possible valve job
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Unread 07-22-2011, 12:00 PM   #8
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Quote:
Originally Posted by 94YJ4L View Post
Thanks for the advice...this will go on the list of things to do, along with timing chain, clutch, slave cylinder, and possible valve job
Might as well do the timing chain while the rad and water pump are out; your already half done.

Glad I could help.
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