Radiator Leaking after Heater Core replacement - Page 2 - JeepForum.com
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post #16 of 24 Old 02-04-2018, 04:49 PM
Jerry Bransford
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I just replaced the thermostat housing on my 2004 and it leaked from the lower bolt. When I took it apart I found the hole is drilled through to the cooling passage behind the thermostat and without sealant it was leaking. Maybe new it didn't do that but it sure does now. Obviously other people have better luck than I do or possibly others aren't drilled through? While I agree the gasket doesn't need RTV, my bolt sure did.

I just did my radiator and all the hoses too, was easy, I'd say much less hassle than a heater core.
The bolts that hold the thermostat housing have two different lengths. Sounds like perhaps a previous owner used the longer (or at least too long of a) bolt in the wrong hole and punched through into the head's coolant channel.


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post #17 of 24 Old 02-04-2018, 06:31 PM
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Originally Posted by Jerry Bransford View Post
RTV is not needed anywhere in the cooling system. All you need are totally 100% clean gasket surfaces where all of the old gasket material has been removed for a leak-free joint. I have even had to cut a gasket out of cardboard (literally from a MRE box) on the trail to use after removing a thermostat that went bad. It was 100% leak free until I finally had enough time to install a new thermostat and gasket.
BTDT many times. you'd be surprised at the number of people that think your nuts to do maintenance that way.
I rebuilt the carburetor on my 1963 48 passenger school bus with nothing but cardboard from a 12 pack and some Gasgacinch Gasket Sealant.
We were several hours up in the mountains east of Sacramento. When your stuck you have to use what you got... IMO
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post #18 of 24 Old 02-04-2018, 06:40 PM
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Originally Posted by Knuckelhead View Post
BTDT many times. you'd be surprised at the number of people that think your nuts to do maintenance that way.
I rebuilt the carburetor on my 1963 48 passenger school bus with nothing but cardboard from a 12 pack and some Gasgacinch Gasket Sealant.
We were several hours up in the mountains east of Sacramento. When your stuck you have to use what you got... IMO
Isn't the actual gasket basically made of cardboard anyway?
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post #19 of 24 Old 02-04-2018, 06:59 PM
Jerry Bransford
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Isn't the actual gasket basically made of cardboard anyway?
Pretty much.

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post #20 of 24 Old 02-04-2018, 07:04 PM
Knuckelhead
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Isn't the actual gasket basically made of cardboard anyway?
Yep...
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post #21 of 24 Old 02-04-2018, 10:12 PM Thread Starter
fishnyc22
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Quote:
Originally Posted by pagrey View Post
I just replaced the thermostat housing on my 2004 and it leaked from the lower bolt. When I took it apart I found the hole is drilled through to the cooling passage behind the thermostat and without sealant it was leaking. Maybe new it didn't do that but it sure does now. Obviously other people have better luck than I do or possibly others aren't drilled through? While I agree the gasket doesn't need RTV, my bolt sure did.

I just did my radiator and all the hoses too, was easy, I'd say much less hassle than a heater core.
thanks to you and the other above for the tips. Definitely won't use RTV on the gaskets. But I will use teflon thread sealant on the bolts as that seems important. Really appreciate the replies.
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post #22 of 24 Old 02-04-2018, 10:15 PM Thread Starter
fishnyc22
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Originally Posted by Knuckelhead View Post
BTDT many times. you'd be surprised at the number of people that think your nuts to do maintenance that way.
I rebuilt the carburetor on my 1963 48 passenger school bus with nothing but cardboard from a 12 pack and some Gasgacinch Gasket Sealant.
We were several hours up in the mountains east of Sacramento. When your stuck you have to use what you got... IMO
That's some MacGyver skills right there.
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post #23 of 24 Old 02-06-2018, 04:39 PM Thread Starter
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It is, but it twists in from the bottom. Unlike some older ones, which I believe went in through the firewall.
Thanks JEK3. I didn't realize the blower removed that easily from the box. Removed it. Cleaned it throughly and its running silently now. Cheers!
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post #24 of 24 Old 03-12-2018, 06:54 PM Thread Starter
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Hey guys. I just created a new post about an issue I"m having after replacing the RAD, Water Pump and Stat. Can you please take a look and let me know if you have any thoughts on whats going on. Thanks!

https://www.jeepforum.com/forum/f9/pr...ating-4265329/
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