- Location
- Southern Maryland
First thing is get an infrared temperature gun and measure heat at the thermostat housing. The senders and sensors are pretty unreliable.
This. After verifying temp and seeeing temp change when tstat open/close, my ICP gauge shows ~10 deg. higher than what it is.First thing is get an infrared temperature gun and measure heat at the thermostat housing. The senders and sensors are pretty unreliable.
Yep on my second ZJ fan clutch from Napa. First one was from eBay with a napa part number. After swapping out everything else I figured the eBay clutch might not be working properly. Now I have two clutch fans, 2 water pumps, a spare radiator, ton of thermostats and a bunch of other spare parts. Going to give the Mopar radiator a shot after the IR temp light. Ordered one a few days ago to test my fuel injectors.I might have missed it, but did the rebuild include a new fan clutch?
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For the HO is right on the thermostat housing. I drilled a small hole in the 12 o'clock position to help the air get out. Elevated the front driver side to get the fill tube to the highest point. Ran it to temp a few times using a no spill funnel 1/2 filled with fluid. Kept doing that until the bubbles stopped. Was a pain but if theirs still in air bubble in there its going to take a small miracle to get it out. I shook the jeep around a bit too while it was going to try and dislodge any stubborn ones.
later HO's used the engine temp sensor on the thermostat housing for both PCM and instrument cluster. early HO's had 2 the instrument cluster has its own sender on the rear of the head on the drivers side. has one wire coming off the top of it. they tend to trap air in that area. if you can get the rear of the jeep on ramps wait for the engine to cool down and remove the sensor ever so slightly to bleed the air. watch out its going to want to push that sensor out.
Did someone leave a shop rag in the motor when they "rebuilt" it? Working at Chrysler/Jeep/Dodge for 11 years and I have seen this twice...
Just a thought.
.... I.... I'm not even sure how to respond to that lol. Any tips on locating or checking for it?
Did you verify / eliminate the overflow? Should see the bottle level rise after turning off the engine, then drop back down again when engine is restarted