Failed radiator at 48k

Oscar-Mike

JK Enthusiast
Joined
Nov 26, 2019
Messages
459
Location
Cape MO
Your old coolant just lost it's shelf life. No need for a new radiator - trust me, I have 3 jeeps :)

1. Buy the coolant per your jeep specs. (HOAT / OAT)
2. Drain the entire coolant and flush it good.
3. Refill it with a new fresh coolant.
4. Burp it properly and get air pockets out.

You just saved lots of $$$
 

BLACKJKU

JK Enthusiast
Lifetime Supporting Member
Joined
Feb 22, 2020
Messages
421
Location
Huntington In
I find it hard to believe that a radiator with that many miles on it is plugged up. What year is the JK?

Is your cooling fan coming on when it's supposed to?
 

Chris

Administrator
Staff Member
Joined
Sep 28, 2015
Messages
31,028
Location
Florence, AZ
I find it hard to believe it's the radiator as well.

Did they pressure test the radiator to confirm it's leaking? Have you inspected the color and condition of the coolant?
 
OP
Kent in Upstate NY

Kent in Upstate NY

New Member
Joined
Apr 19, 2020
Messages
2
Location
Granville, NY
The loss of coolant was the big clue. It was down a quart last oil change two weeks ago and was topped up. I had to add water just to drive to the dealer today.
 

BLACKJKU

JK Enthusiast
Lifetime Supporting Member
Joined
Feb 22, 2020
Messages
421
Location
Huntington In
If it's leaking at the radiator it should be easy to see, my radiator had a leak and found it was just the radiator cap was bad. Put a new one on and no more leak.
 

Oscar-Mike

JK Enthusiast
Joined
Nov 26, 2019
Messages
459
Location
Cape MO
A radiator will only fail if there is a "plugged and/or leaky" tubes.
If the fluid is flowing thru the tubes there is no way the rad will fail unless the outer fins are caked-up with dirt mud.
Dirt/mud: the mud prevents air flow thru the fins to cool the tubes while in motion.
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