I installed an sunpro mechanical temp gauge in my 96xj with the 2.5 4cylinder motor. I installed it in the thermostat housing where the other temp.sensor is that sends the.info for the.fuel.curve.and.runs.the.fans. I installed it.using an T fitting i found.at.the local plumbing store so i could still utilize the factory sensor.as.it.is.needed along with the sunpro. My problem is.the.sunpro guage dosent work when the jeep is running it stays at 100 or it mightt move up to 130 or.so but no higher. Then when i turn off the jeep the.sunpro works perfectly fine.it will rise.up 190ish. I know the fitting is getting sufficient coolant flow for.the sensor to work just dont get an reading until i turn off the jeep. Any help is appreciated.

 

Does it stay between 100-130 at all times when it's running? If it idles, does it climb? Sounds like your thermostat might be stuck open. Find a good thermometer and put it on the upper radiator hose and take a reading.

 

It most of the time stays at 100 but it has risen to 130 a couple times. I was thinking it might be the thermostat also..

 

I think it might rise a little when it idles but not much... ill let it idle for a minute when i get home and see

 

Replace the thermostat and do a coolant flush and see how it reads afterwards.

 

Well ive replaced the thermostat and the guage still does not work when the jeep is running. I let it sit outside and warm up for 10mins and then drove it up the rode and.the.guage didnt move at all. then i turned the jeep off and it starts working like it should. i even tried turning the jeep on after the guage had moved to 180 and the.guage just drops down as far as it can go around 100. what is goin on? has anyone had this happen to them?

 

post a pic of the housing? i'd like to see how you installed it.

 

t fitting

 

I am having the same problem,but with a fan switch.installed it in the same location,the fan comes on 10 seconds after I turn off the truck but not when is running.

 

Whats temp on dash gauge reading ? water has beeen run thru radiatoor allready when it reaches that fitting it will be cooler than actual motor ruiing at this point so its gonna read cooler . Also might be a air pocket trapped there causin coolant not to make contact with probe .

 

I have a dummy light in my guage cluster and the bulb is blown. So i kinda need to figure out the problem with this temp guage. I was thinkn it could.be.an air bubble also. But the guage works fine when vehicle isnt running. How would i go about bleeding the air out if there is any in there. Is there some type of.valve i can loosen to bleed it anywhere?

 

When i turn the jeep off the temp guage will read right.at 180 after about 3-4 minutes which is right cause i just installed an180 thermostat.

 

just loosen the fitting some untill coolant flows out then retighhten when cold of course ,ever think of a cluster swap very simple to do ?

 

Might be forming a little air pocket in the top of the tee when the engine is running and fills when shut down. You could rotate the Tee so it's in the horizontal position and see if it makes a difference.

 

Well i loosened the fitting and let some coolant spew out and it helped out a little but the guage only reads 140 or so