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It's not important, just tighten it.
Drain the water from the cooling system. Remove the water hose from the heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
On 83 heater core 4 or 6 nuts on fire wall under hood remove hoses go into pass side and remove glovebox if needed and disconnet cables and pull heatererore box out change heat core
The main two differences is the CJ5 has a 83" Wheelbase and the CJ7 has a 93" Wheelbase. The door openings are different. The CJ5 has a S shaped opening and the CJ7 has a U shaped opening. The bottom line is the CJ5 is just smaller. Other than those 2 things they are basically the same vehicle. Of course there are other differences in appearance and trim.
83 to 68 is an 18.0723% decrease.
To change any percent into a decimal, multiply the percent by 0.01 (exact); therefore 83 percent = 0.83
On the windshield frame, right in front of the driver, behind the dash pad. The motor mounts to the inside wall of the windshield frame and drives the linkage that is inside the frame.
YOu can purchse an immersion heater by going to the following website http://www.chromalox.com/productcatalog/Industrial+Heaters/Immersion+Heaters/product-family-router.aspx?f=83
15.6627% increase.
I had an 85 cj-7 doing the same thing. i changed the catalytic converter and problem solved. You may want to try it. The catalytic converter can become plugged or restricted.
An increase of 107.5%
Either one of the heater hoses are leaking or you have a freeze plug on the side of the engine leaking.