close to overheating
09-05-2015, 02:25 PM
#1
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Location: Largo, FL
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Year: 1995
Model: Cherokee
Engine: 4.0 HO
close to overheating
Took her out for a long cruise today, to do a little fresh motor break in. I ended up getting stuck in traffic. Keeping an eye on my gauges, I noticed my temp creeping over 210. It's never done that before so I kicked open the vent to blow some heat, to keep her calm. I got home safe... applied power directly to the fan... Works! Pullingd the relay and applied power to it... It .Kicks on/off. What else could it be? I did probe around in the PCM a little. According to lunghd, pin 5 to ground should have continuity... I did not! Where did it go?
On the bright Sid I fixed d my low beam issue while I was in there.
On the bright Sid I fixed d my low beam issue while I was in there.
09-05-2015, 02:51 PM
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Year: 97
Model: Cherokee
Engine: 4.0
Every Fresh Engine...
Took her out for a long cruise today, to do a little fresh motor break in. I ended up getting stuck in traffic. Keeping an eye on my gauges, I noticed my temp creeping over 210. It's never done that before so I kicked open the vent to blow some heat, to keep her calm. I got home safe... applied power directly to the fan... Works! Pullingd the relay and applied power to it... It .Kicks on/off. What else could it be? I did probe around in the PCM a little. According to lunghd, pin 5 to ground should have continuity... I did not! Where did it go?
On the bright Sid I fixed d my low beam issue while I was in there.
On the bright Sid I fixed d my low beam issue while I was in there.
Every fresh engine I have ever installed ran warmer until everything seated and friction was reduced to normal. New Marine Engines are the worst because of such tight tolerances.
09-05-2015, 09:09 PM
#5
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Year: 1995
Model: Cherokee
Engine: 4.0 HO
It s all good. Just trying to massage out all the bugs, since it's back on the road. I have more problems now, after the motor build, than I did beforehand. I'm down to the little amount of coolant I lose (don't know where) and the aux fan not kicking on. I also need to recharge the ac still, so that works again.
09-05-2015, 09:38 PM
#7
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Year: 97
Model: Cherokee
Engine: 4.0
Continuity?
Curious? I am guessing you already swapped the relay with a working one to check it but might want to check the continuity of the wire running through the loom to the fan. I know I have pulled or pinched many a wire in hard to see places doing engine R&R work
I'm trying to find a circuit diagram for you now.
Last edited by Bugout4x4; 09-05-2015 at 09:42 PM.
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09-05-2015, 09:47 PM
#8
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Year: 1995
Model: Cherokee
Engine: 4.0 HO
I didnt try another relay per-se. I pulled out the relay and tested it with a power supply and multimeter and it functioned like it is supposed to. A pinched wire could very well be the cause. I have a Haynes manual to my left and a 95 FSM sitting in my lap.
