relocating coolant temp sending unit

while i was doing a cluster swap i broke my coolant temp sending unit flush with the engine. tried an easy out, but no luck. i want to just relocate it somewhere. its not leaking coolant where the old one was. what do you guys think, should i get a t-fitting and put it in one of the coolant lines, or tap a hole in the thermostat housing, or any other suggestions? thanks in advance for any advice.

If you can't otherwise drill out or remove the old sending unit

get one of these things and put the sender in-line with the upper radiator hose. The picture doesn't show it but there's a 1/8th NPT threaded fitting for a sending unit. Not sure what the temp sending unit threads are, might need to adapt a bit.



from here (and elsewhere)

http://www.deftracing.com/prosport_gauges/water_temperature_sender_radiator_hose_adaptor.htm

Same thing, better pictures here:
http://www.frsport.com/Greddy-Radiator-Hose-Water-Temp-Sensor-Adapter-30mm-to-40mm_p_9267.html


not sure of the size for Cherokee - the one I got to support a mechanical water temp gauge was in inches and not metric and I can't remember what that was.

rickolis22 said:

while i was doing a cluster swap i broke my coolant temp sending unit flush with the engine. tried an easy out, but no luck. i want to just relocate it somewhere. its not leaking coolant where the old one was. what do you guys think, should i get a t-fitting and put it in one of the coolant lines, or tap a hole in the thermostat housing, or any other suggestions? thanks in advance for any advice.

Click to expand...

If I read you right, you broke it at the back of the head?
Newer models (94+?) have one in the T-stat Housing. (I'm ASSuming you have a pre 94.) Get one of those housings and put a sender there. I put a second temp gauge in my 87 this way.

mine is a 94, 4.0. the sending unit for the gauge is on the back of the head, thats the one i broke. i think the one you are talking about may be for the computer.

rickolis22 said:

mine is a 94, 4.0. the sending unit for the gauge is on the back of the head, thats the one i broke. i think the one you are talking about may be for the computer.

Click to expand...

Ya, then that won't work. 94+ already have that spot taken. That #2 post looks good...

anyone know what size i would need for the xj ...

i have a 99 motor in my 95 and no way of conecting the sending unit, and i dont feel like tapping the block ....

you can tap another hole into the water housing

do you think i could rig something like the picture in the second hose with parts from a hardware store?

sure if you can find a fitting that will work with the sender's threads