Well as u can see i am new to jeeps. Ive posted so may questions it isnt funny but everyone on this forum has helped me with all my jeep problems so thank you. ok now onto my efan problem. I bought a jeep xj year 96 and the previous owner had the efan rigged to turn on by switch. efan was broken so i replaced it with one from 92. when the temp reaches over 210 the fan does not ingage. the temp just keeps rising. So i looked under the hood and the 15a fuse was blown, replaced it it blew again. wound up being a short. fixed short fan still does not come on. So switch relays still nothing. but when i jump the fan through the fuse box in the relay socket the fan come on. so there is no broblem with the wiring. I beleive the ECU is bad because it does not tell the efan to engage. forgot to mention i replaced the temp sensor in the tstat housing and it read temps fine on guages and obd computer.

thanks

 

Is it reaching 218F?.....that's when the efan turns on.

 

yea it reaches well over 218F. the fan doesnt go on

 

Had the same issue with my 97 sport. said f**k it and put it back to a toggle switch never had a problem since.Good luck if your determined on putting it back stock.

 

still cant figure out whats wrong. think my ecu is messed up since thats the only other thing i can think of that can be causing the problem

 

have you seen this infohttp://www.lunghd.com/Tech_Articles/..._Diagnosis.htm

 

Yea I saw it. Thats why I'm thinking it's my PCM that wont urn the fan on. But the PCM is the ecu in obd2 systems