I'm leaking about one tablespoon of coolant a night from around the 2 sensors that are in the assembly that the upper radiator hose connects to on my '99 2.5L XLT. Never seems to leak during driving.

Tried tightening the sensors a little and that did not solve the problem.

Is it more likely that it is the inserts that are pressed into the plastic piece that receives the sensors that is causing the leak? If so, what is this thing called and what is involved in replacing it, I can't tell how it's attached?

No major rush to fix, just buggin me.

Sorry, I don't have Ranger manual, yet!


TIA

 

The sensors are threaded in. They probably need to be removed and the threads cleaned then threaded back in with a little liquid teflon pipe thread dope. Do not use teflon tape. Small pieces of paper towel can help detect the source of the leak.

Thanks for using FTE!

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Why not the teflon tape? I use it all the time on engines.

 

The sensors are solid brass where the threads are. So, the sensor itself
can't leak by the plastic insulator. The thermostat housing could be
leaking also.....

 

I'd say if both look like their leaking it might be the goose neck gasket. Might need to add alittle gasket seal.

 

Greenpus (nasty stuff)-

Some (but not all) sensors require a ground to the block for operation. Teflon tape can interfere with that ground. Also the teflon tape does not seal as well (especially the cheap stuff) as the liquid/paste type pipe dope. Teflon tape can interfere with the "feel" you get when tightening a fitting etc. This can lead to splitting a thermostat housing or manifold, particularly aluminum ones, or pulling threads.

In order to avoid confusion for novice or some "experienced" mechanics it is better to just not use the teflon tape. You will find this "tip" in many repair manuals. Use the liquid stuff to get the job done and sealed right the first time...

Never use teflon tape on hydraulic fittings or oil lines.

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Got some Teflon liquid dope to try. Waiting for it to stop snowing and warm up in Dallas. Maybe next weekend.

Also cracked the windshield in my '02 Boxster S last night so that's taking priority right now....

 

David, you're breaking my heart.....busted the windshield on your Porsche....

Although I've gotta admit that one of the best driving experiences I've ever had was working out a late 1980's 928S. Yowza...I could see how you might get addicted.