Kevin Donahue
Member
- 58
- 4
- 8
- Location
- Chesterfield
Hi all,
Took my M1123 on a 4 hour round trip plus some fairly hard trails this weekend. Needless to say I was impressed! ATV Riders on the trail were bewildered that a truck was there with them making it through the tough obstacles so well.
However, the fan is running a lot on the highway/ main roads. Water temp will stay somewhere between about 201- 220 degrees the entire time (verified this is pretty accurate but maybe the gauge is reading 5-10 degrees hotter than it actually is compared to the temp gun) and once it comes on it never really turns back off.
Isn't the fan supposed to cool the engine all the way down to like 185 then shut off only to come back on again around 220?
Mine seems to kick on around about 210 and just run all the time. Sometimes the motor will cool to maybe 201 and sometimes it will hit almost 220 but never go a hair over that or a hair under 201. Even when I throw hard trails at it with little air flow I see the same operating temps.
The only time the fan seems to shut off on its own is when I am slow cruising gravel roads around 40MPH or less but operating temps read almost exactly the same.
My thought is the thermostat is running the motor on the hot side, maybe failing to open all the way so even though the fan is doing its job the fan cannot cool the engine down to those sub 200 temps like it should. I have a new Thermostat, fan switch, and time delay module on order, will report back the results but let me know what you guys think.
Note this is a pretty clean truck. Odo read only 300 miles when I got it and the undercarriage was show car clean so I believe that to actually be accurate. I highly doubt I have any debris between the tranny cooler and radiator and seems unlikely my radiator is shot. However it has been sitting for a long time I'm sure so maybe there is some scale buildup internally.
Took my M1123 on a 4 hour round trip plus some fairly hard trails this weekend. Needless to say I was impressed! ATV Riders on the trail were bewildered that a truck was there with them making it through the tough obstacles so well.
However, the fan is running a lot on the highway/ main roads. Water temp will stay somewhere between about 201- 220 degrees the entire time (verified this is pretty accurate but maybe the gauge is reading 5-10 degrees hotter than it actually is compared to the temp gun) and once it comes on it never really turns back off.
Isn't the fan supposed to cool the engine all the way down to like 185 then shut off only to come back on again around 220?
Mine seems to kick on around about 210 and just run all the time. Sometimes the motor will cool to maybe 201 and sometimes it will hit almost 220 but never go a hair over that or a hair under 201. Even when I throw hard trails at it with little air flow I see the same operating temps.
The only time the fan seems to shut off on its own is when I am slow cruising gravel roads around 40MPH or less but operating temps read almost exactly the same.
My thought is the thermostat is running the motor on the hot side, maybe failing to open all the way so even though the fan is doing its job the fan cannot cool the engine down to those sub 200 temps like it should. I have a new Thermostat, fan switch, and time delay module on order, will report back the results but let me know what you guys think.
Note this is a pretty clean truck. Odo read only 300 miles when I got it and the undercarriage was show car clean so I believe that to actually be accurate. I highly doubt I have any debris between the tranny cooler and radiator and seems unlikely my radiator is shot. However it has been sitting for a long time I'm sure so maybe there is some scale buildup internally.