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please help

P

Purple XJ

NAXJA Forum User
Location
long island
To make it simple i did a coolant flush new thermostat 195* new thermostat housing flush whole system and now it wont run above 140 while driving but if i let it sit for a while idling it will warm up. its a 1999 4.0
 
i put the thermostat in correctly and its the third one i tried all the ones i get are from auto barn i just tried bleeding the system again i got alot of air out of the system and its staying around 180 now but as i drove it still went down in temp quick
 
is the temperature sensor reading correctly? seems like it is getting a backward signal or something maybe it's giving a false reading.
 
1. Your temperature gauge reading is coming from the PCM's interpretation of CTS data it has received.

2. Check the connection to the CTS in the thermostat housing.
 
Purple XJ said:
...Did a coolant flush, new thermostat 195*, new thermostat housing, flush whole system and now it wont run above 140 while driving, but if I let it sit for a while idling it will warm up. It's a 1999 4.0
Click to expand...

On a 99 would it make a difference if there was thread sealer on the sensor?...and to OP is there thread sealer on the CTS?
 
Hey Paradise,

I think I answered this question wrong last week and it was determined that on the later models teflon tape or thread lock is not an issue - just the earlier models with the 2 sensors the 1 wire one at the rear needed contact to the block.

By the way, you never did confirm if the hottie in the XJ pic on the post a couple of weeks ago really was your daughter.
 
BrokenSockets said:
Hey Paradise,

I think I answered this question wrong last week and it was determined that on the later models teflon tape or thread lock is not an issue -
Click to expand...

Oops...I forgot about the two wire part. I mush have had my mind on a few aftermarket sensors I am installing.
 
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