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What is this on my rad cap??


Dzimm
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So I was changing the thermostat on my 95 XJ due to it running at 160* and found this when I pulled the rad cap off.

 

It was like the hairball your wife leaves in the shower drain for you but in white, with some copper antiseize mixed in.

 

Jeep was running rich due to the 180* thermostat the PO put in it. It has a new rad of unknown pedigree due to the pass side motor mount bolts breaking and sending the fan through the old rad (unsure if this may be part of the mystery). After putting a 195* thermostat in it, it runs at 210* but still isn't running as good as it could.

 

Anyone see anything like this before? 8f8b0b4a4a152ff27e0eafb262b905d8.jpg616097b0b9e0cbd679b285b0ede0fd04.jpg

 

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I've never seen stop leak like this before.  They must have been trying to stop a monumental leak with it.  

 

But that doesn't explain the hair-like fibers.  

 

The cat is definitely a possibility... It was prolly chasing all the stupid mice out here... 

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I’ve never seen a gunked up clog of stop leak like that before, it’s like they dumped it all at once not letting it circulate. Some times tell tale remnants settle around the cap trying to seal the expansion line. Dunno what the PO was trying to seal but they were serious about it.
Maybe the heater core went out?


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Heater core is good.  Maybe they thought they could patch the rad with it after the mech fan went through it?  

 

My best guess is that the old rad was leaking before it got destroyed. Everything else seems fine and there wasn't any gunk in the thermostat housing at all.  It was actually very clean. 

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1 hour ago, Ωhm said:

Make sure the coolant recovery bottle and hose from radiator, if equipped, doesn't have that stuff living in it. 

Reservoir is fine and all vac lines and recovery lines are new.  

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MacGyver's personal Jeep FOR SALE!!!  !!!RARE!!!! Low miles, tons of rust holes for better airflow through the cab, and gas smell to ward off unwanted guests.  $10,000. 

With lots of duct tape patches and nicks from Swiss Army knives. Complete with Roseanne Barr stop leak. A must for any fan of vintage television.  

 

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With lots of duct tape patches and nicks from Swiss Army knives. Complete with Roseanne Barr stop leak. A must for any for of vintage television fan.
 
 
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Funnily enough, here is my solution to a rust hole in the door that goes through to the cab... Yup that's duct tape. 02f1236b83a3df644e960d9a29c46b04.jpg

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2 minutes ago, Green Mesa XJ said:

Have to get Richard Dean Anderson to sign it for you :)

I used duct tape on my first car a VW, gorilla tape on a car I had where the previous owner drilled holes for a spoiler then never installed it.


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It's the best solution when you don't care much how it looks.    Even if you do care, the matching color tape blends pretty well from 10+ feet away. 

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