AnotherOldJeepGuy

Here's a new 5% Rock Auto Discount code good through Nov 13. Code: 354930181172570460 Input in the "How Did You Hear About Us?" box when ordering (see Sept 25 Post)

I often learn stuff here, today I am learning the existence of these plugs. I have been hunting a coolant leak, perhaps I need to "expand" my search to these things. Are the locations I have marked "?" also expansion plugs?

The last squeaky serpentine belt that I successfully quieted I did so by: - took the belt off and scrubbed it clean in the sink with dove soap, rinsed well and completely dried it. - cleaned all the things the belt touches with dove soap and a toothbrush. Reassembled and the squeak was no longer there.

2nd the allen head inside. I had my calipers off not too long ago and I don't believe the boot came off with the bolt.

Awesome, thanks!

I swapped out the TPS on my 1990 4.0L (automatic) in a debug activity, there was no change (so the original was OK) but since I had the new one installed I just left it in there. I kept the original, which was installed maybe 5-6 years back. I don't need both, if you want my working original you can have it for shipping cost. DM me if you are interested. Again this one is for an automatic, but according to @Eagle_SX4 it will work.

Decided to drop in a gotcha on the coolant dye. It works great to locate the initial leak. But going forward it is problematic. Case in point, the original dye infusion located a leaking spot as noted earlier on July 24. The gotcha comes along with the fix. It was pretty much impossible to remove the tstat housing without contaminating the edge of the water pump gasket when you remove the original tstat housing. I did try with a garbage bag and shop towels to keep from getting coolant on things like belts, pulleys, and the engine area just below it, but it was not possible to capture all the coolant. I know from my previous snooping back in July there was no leak identified by the dye around the water pump. And swapping out the tsat housing didn't require disturbing the water pump installation in any way. But now that even a little of the dye managed to get on the exposed part of that gasket, it now lights up. Other solid surfaces where the coolant got to can be cleaned off with just water, but the gasket material sucked it in, and that can't be washed off. Since I didn't have a leak at the water pump before, I am sure I don't have one now either, but unfortunately the UV flashlight would like me to believe otherwise. Thought this was worth sharing for future reference.

AC Delco 18001L matched up better than I actually thought it was going to when I first saw it. Had to cut about 3" off the short leg.

Just reattached mine with Permatex 81840 "Extreme". Seems pretty securely attached for now at least. I also put a little lithium grease in the lower track and that made moving it a lot easier. Not sure how long the grease will last but it's easily re-added as needed.

I have thought of this a few times, and figured any place I put it, someone could find it, if they really looked. Not so sure there would be a lot of looking, but that's beside the point. But something like one of these would do the job and still be secure to the convenient theft thief anyway.

Can you confirm I have correctly interpreted your advise in the pic below, yellow scribbles where you are suggesting gasket maker needs to be placed?

I got out the calipers and started measuring, looks like Rock Auto AC Delco 18001L matches up pretty well. Tstat housing end measured approx .8" and the pipe at the other end measured approx 0.65". The wildcard here is when the bend occurs. My measurement show a straight hose for approx 18", then bend and go approx 6 more inches. The total length of the 18001L lines up but they don't spec the 2 lengths on each side of the bend, so once I get it I'll post if it's a match.

I still think for now I was successful putting on the tstat housing not leaking, but the hoses want to leak at that housing. I think the larger one going over to the radiator may be OK once I tightened it more, but the smaller one going back to the heater valve continues to leak and I have tightened it as much as i can, so I guess I'll replace it. I see in the parts cat the hose part number is 5600 4783, but as I tried the various parts websites, sometimes I find a cross and sometimes I don't. So, can anyone tell me the ID at each end and I'll search that way.

. I didn't think of the aluminum aspect, I'll keep that in mind going forward.