All,
I just pruchased this jeep a little over a week ago and I am trying to go through it to make sure things are right.

Pic of Jeep


The first thing that bothers me is the Temp. gauge. It will only register to a little past the first tick mark on gauge.

Pic of gauge...

Thats as high as it goes. When I first got the Jeep it was working fine. I dont like driving around not knowing the exact temp. The PO also made a "mod" to the thermostat housing.


Not sure if this is causing the problem or not.

The second thing is that he wired the electric fan to come on when key is in the acc. position. It is wired directly to the fuse block in the cab of the Jeep. This does not really bother me too much but I know it isn't right.

Its the Blue wire. Havent figured out what the red, yellow and black are there for yet.

Any help would be greatly appreciated. I have not purchased a Haynes/Chilton yet as I am waiting to find a good deal on an FSM.

Matt

 

For the fan, see if you can find the sensor still on the block and just wire it back up, he might have been a cheapo and didn't want to buy another sensor.

For the Thermostat housing, where is that second line going to? the yellow one.
I would assume that sense the Temperature sending unit is no longer in the thermostat housing it wouldn't give you an exact reading, but there's no way it could be THAT off. Maybe if you place is back where it should be, it will work fine. It all depends on what that yellow wire does I guess.

 

Thanks.
I have to trace out that yellow wire. I goes into the wire loom and hard to visually trace with out a wiring diagram. Gonna have to go get a Haynes manual.

Matt

 

it does throw it that far off. i tried this before i just put my new sensors inline instead of in the housing

 

what do the fans look like. are they both elecrtric? or is it 1 mechanical fan and one electric fan. what does the wiring look like going to the electric fan?

 

1 mech and 1 elec. The electric is still hooked up to the factory connectors. They spliced the wires after connector with wire nuts and hard wired it to the fuse box. I will snap a pic tomorrow.

Matt

 

where the yellow wire hooks into the harness is just about where the original temp sender for the gauge is, and if that little setup is throwing off your temp gauge then that will explain why the po hooked the fan to ignition power, cuz the fan will never turn on if the ecm thinks the temp is that low.

 

Found this thread this morning.
https://www.cherokeeforum.com/f2/nee...or-gauge-8358/
I think the PO extended the Sending Unit with the yellow wire to the T-Stat housing and added the TEE to put the CTS on one side and the Sending Unit on the other.

The thing that makes me wonder is that it was working when I fist got it. Temp gauge was registering a normal temp reading.

Back to troubleshooting today when I have the time.

Matt

 

Think I found the issue. The pigtail that plugs into the sending unit was making a bad connection. Took off the plastic piece and just plugged it in and seems to work. Let it idle for a while and it got up to almost 200*. I was also taking voltage readings as it was idling just out of curiosity. Cant really drive it around right now cause I have had a few cold beers in the process of working on it. Live right by the sheriffs dept. so it can wait till tomorrow.

Matt