LOST JEEPS :: View topic - 06' KJ overheating

I was driving my jeep home from work today, and I noticed it started a little rough. I actually had to tap the gas while turning over the engine. a few miles later, the bell started going off which I thought to be the seat belt indicator. after the third time dinging (no MILs) I realize the temp gauge was pegged so I pulled into a lot and shut it off. I should also add on the drive my A/C wasn't really working. After letting it cool down for a bit I started it and the e-fan didn't turn on. I suspect the fan, or relay is bad. all the parts stores are closed for the night, is there any way to test the two?

I got your PDF, and I appreciate it. unfortunately I still haven't figured it out.

I am seeing a pattern though. I replaced the fan, and of course it didn't change anything. The relay seems to work properly (I tried swapping it with the other 40a relay for the blower motor, both worked fine.) Like I mentioned, the air conditioning definitely does not work. I have found other threads that relate the two issues, but it seems no one updates there threads when they solve the problem.

So the question is, my radiator fan and air conditioning stopped working at the same time. the fan works, and so does the relay. what else would control the two?

I don't know much about relays, but I think this is + and -. so I obviously have power to the relay, but I wasn't showing any at the fan. I'm not sure where the circuit goes between the two, and it's raining at the moment. I'll update with any findings.

99_XC600, thanks for sticking with me here. I've officially succeeded in looking like an idiot. :roll:

If you ever find yourself in the Florida keys, look me up. I'd be happy to buy you a beer.

Author:	KJ kyle [ Tue Jul 31, 2012 7:02 pm ]
Post subject:	06' KJ overheating
I was driving my jeep home from work today, and I noticed it started a little rough. I actually had to tap the gas while turning over the engine. a few miles later, the bell started going off which I thought to be the seat belt indicator. after the third time dinging (no MILs) I realize the temp gauge was pegged so I pulled into a lot and shut it off. I should also add on the drive my A/C wasn't really working. After letting it cool down for a bit I started it and the e-fan didn't turn on. I suspect the fan, or relay is bad. all the parts stores are closed for the night, is there any way to test the two?

Author:	99_XC600 [ Tue Jul 31, 2012 9:38 pm ]
Post subject:	Re: 06' KJ overheating
KJ kyle wrote: I was driving my jeep home from work today, and I noticed it started a little rough. I actually had to tap the gas while turning over the engine. a few miles later, the bell started going off which I thought to be the seat belt indicator. after the third time dinging (no MILs) I realize the temp gauge was pegged so I pulled into a lot and shut it off. I should also add on the drive my A/C wasn't really working. After letting it cool down for a bit I started it and the e-fan didn't turn on. I suspect the fan, or relay is bad. all the parts stores are closed for the night, is there any way to test the two? Open the hood and go to the "PDC" within the PDC. You will see relays R34 (Rad Fan Hi) and R40 (Rad Fan Lo). Take a piece of wire and make a jumper out of it. With the key on, remove the relay and insert the jumper into the contacts. The fan should turn on. It should be a 3 pin relay. Meaning that there is a 12v source, a ground and then a triggering circuit. The triggering circuit would get 12v applied from the PCM when the coolant temp sensor registers the upper limit. Once the voltage is applied the relay would close and then allow voltage to pass through to the FAN. You will need to use a multi-meter to detemine the 12v leg and ground to make sure you are jumping the correct leg's of the circuit to activate the fan. If you PM me your e-mail address. I'll send you a PDF of the owners manual which has the explanation of the PDC and Fuse Box.

Author:	KJ kyle [ Thu Aug 09, 2012 4:48 pm ]
Post subject:	Re: 06' KJ overheating
I got your PDF, and I appreciate it. unfortunately I still haven't figured it out. I am seeing a pattern though. I replaced the fan, and of course it didn't change anything. The relay seems to work properly (I tried swapping it with the other 40a relay for the blower motor, both worked fine.) Like I mentioned, the air conditioning definitely does not work. I have found other threads that relate the two issues, but it seems no one updates there threads when they solve the problem. So the question is, my radiator fan and air conditioning stopped working at the same time. the fan works, and so does the relay. what else would control the two?

Author:	99_XC600 [ Thu Aug 09, 2012 8:10 pm ]
Post subject:	Re: 06' KJ overheating
KJ kyle wrote: I got your PDF, and I appreciate it. unfortunately I still haven't figured it out. I am seeing a pattern though. I replaced the fan, and of course it didn't change anything. The relay seems to work properly (I tried swapping it with the other 40a relay for the blower motor, both worked fine.) Like I mentioned, the air conditioning definitely does not work. I have found other threads that relate the two issues, but it seems no one updates there threads when they solve the problem. So the question is, my radiator fan and air conditioning stopped working at the same time. the fan works, and so does the relay. what else would control the two? So does the fan turn on at all? What happens when you trip the relays. When you turn the AC on, the fans should definitely turn on. It still sounds like you have a relay issue.

Author:	KJ kyle [ Fri Aug 10, 2012 6:44 am ]
Post subject:	Re: 06' KJ overheating
the fan does not turn on at all, A/C or not. are you aware of any other relays or fuses in the fan circuit? Some kind of resistor, or fan controller maybe?

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Author:	99_XC600 [ Fri Aug 10, 2012 8:38 am ]
Post subject:	Re: 06' KJ overheating
First thing I would do is to find the break in the harness to the fan connection and apply 12v to see if the fan even turns on. If the fan's do not turn on, You've found the problem. If not, you need to start working back from the connections and find the break in the circuit.

Author:	KJ kyle [ Fri Aug 10, 2012 3:22 pm ]
Post subject:	Re: 06' KJ overheating
I'm going to pick up a multi-meter after work and start looking. unfortunately I'm in temp housing (military) at the moment, and the only tools I own are a Gerber and an adjustable wrench. someone smarter than me recommended this (a cooling fan control relay) today: I figure it's worth $10, the only problem is I don't know where the thing is located

Author:	KJ kyle [ Fri Aug 10, 2012 8:13 pm ]
Post subject:	Re: 06' KJ overheating
I don't know much about relays, but I think this is + and -. so I obviously have power to the relay, but I wasn't showing any at the fan. I'm not sure where the circuit goes between the two, and it's raining at the moment. I'll update with any findings.

Author:	99_XC600 [ Fri Aug 10, 2012 9:15 pm ]
Post subject:	Re: 06' KJ overheating
KJ kyle wrote: I don't know much about relays, but I think this is + and -. so I obviously have power to the relay, but I wasn't showing any at the fan. I'm not sure where the circuit goes between the two, and it's raining at the moment. I'll update with any findings. Ok, the 13 volt shows the power to one side of the relay. That's very good. Now it's just a matter of taking a piece of wire tripping the other leg until the fan turns on. You already found the 12v source. Now, take one piece of the wire and insert into the source voltage (Red Lead of the Multimeter). Using the relay as a reference. The legs are labeled on the bottom. 85 and 86 are your 12V source 87A and 30 goes to the fan 87 is the trigger circuit. (energizes the relay and closes the switch allowing current and voltage to pass from the source voltage to the fan's Take 2 pieces of wire and connect 85 to 87A and 86 to 30. The Fan should turn on. it may run backwards, but it should turn on. If it runs backwards, just reverse the connections. Think of the relay as a 3 way light switch ( 2 Switches control a single light bulb, like the one you would see in a stairwell) With a 3 way switch, their is always voltage running between the 2. However it shares a common ground for the light to be lit. The relay is the same concept, where there is always voltage applied, it's just waiting for the ground to be closed (ECU - Trigger signal) so it can pas the voltage to the Fan (Lightbulb).

Author:	KJ kyle [ Fri Aug 10, 2012 9:40 pm ]
Post subject:	Re: 06' KJ overheating
99_XC600, thanks for sticking with me here. I've officially succeeded in looking like an idiot. If you ever find yourself in the Florida keys, look me up. I'd be happy to buy you a beer.

Author:	99_XC600 [ Fri Aug 10, 2012 10:37 pm ]
Post subject:	Re: 06' KJ overheating
KJ kyle wrote: 99_XC600, thanks for sticking with me here. I've officially succeeded in looking like an idiot. If you ever find yourself in the Florida keys, look me up. I'd be happy to buy you a beer. Yep, that would do it. I'm curious why it would burn out like that. Try replacing it and see what happens. Mmmm...Beer.

Author:	KJ kyle [ Sat Aug 11, 2012 5:39 pm ]
Post subject:	Re: 06' KJ overheating
the center of the fan was pretty rusty. the salt is murder on vehicles down here. My best guess; too much resistance from the rust build up. BTW, A/C still doesn't blow cold.

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