Bimetallic Temp Sensor issues -
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Unread 10-16-2014, 09:59 PM   #1
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1989 XJ Cherokee 
Join Date: Oct 2012
Location: Raleigh, NC
Posts: 5
Bimetallic Temp Sensor issues

I was recently replacing the flexible air hose from manifold to intake of the Thermostatic Air Cleaner on my '89 Jeep Pioneer, and decided to make sure the cold/hot diverter valve was working. The vacuum motor worked, but when I cranked the vehicle when cold, I noticed the trap door would not close to the cold intake to allow the warm exhaust from the manifold to enter the airbox. Traced back to the bi-metal temp sensor that is attached to the back of the airbox. I dont think it is working; I heated it up and couldnt notice any air flow through it. I dont have a vacuum pump, so what is the best way to check it out? Also, where can I find a new one? Do I need to go to a junkyard to pull one off another old Jeep. I am not sure how long Jeep made this part before they changed it. While I am asking all these questions, some buds tell me its not worth it to fool with it, but I am concerned that it will make for a tuff cold weather commute this winter if I get no advanced warming from the exhaust gases. Does it really make a difference in cold weather?



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Unread 10-17-2014, 07:10 PM   #2
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1990 MJ Comanche 
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 10,255
Your buds are correct.
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos
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