sdigs
NAXJA Forum User
- Location
- Albuquerque, New Mexico
I'm getting tired of running down the highway with the heater on when it's 95 outside. Here's my setup:
94 XJ 4.0 HO 140k miles
RE 3.5" superflex
32x10.5 mud terrains
AW4 tranny
stock gears (i'm guessing 3.55)
The motor is stock. I never had over heating issues before i did the lift and tires but i only had the idiot light. After the lift i started seeing the idiot temp light coming on during long uphill grades.
I swapped in a new dash unit with tach and gauges, i also put in new temp and oil sending units to match the new gauges.
When it is 70* or below outside it runs around 210. Above 75* it runs at 210 around town or if i stay below 50 mph. At highway speeds of 65 mph or more it runs at 220 on flat roads and any uphill grade will push it up to 235. turning the A/C off helps but not much. Running the heater keeps it below 235 but it wont take it below 220 unless i get a long down hill. I just did a 200 mile off road trip and even when crawling in 4 low i rarely saw a temp above 215, until i hit the highway.
I have replaced the thermostat and fan clutch. I run a 2 row aluminum rad from Radiator barn, all installed in the last year. All hoses are new and the electric fan works as it should. 50/50 water/antifreeze
At 55 mph i turn 1750 rpm, 65 mph = 2000 rpm and 75 mph = 2250 rpm. all RPM's are when in drive, speeds are checked by GPS as i have not corrected the speedo.
Does this sound like a low rpm issue causing the engine to "Lug" and run hot or can anyone sugest something else?
I am planning on putting the stock tires back on and trying it out. the only other thing i can think of is a plugged catalytic converter but i just passed my emissions test last month. I'm getting ready to build an adventure trailer but i want to solve my temp issues before i add the load of a trailer to it. Any suggestions would be greatly appreciated.
94 XJ 4.0 HO 140k miles
RE 3.5" superflex
32x10.5 mud terrains
AW4 tranny
stock gears (i'm guessing 3.55)
The motor is stock. I never had over heating issues before i did the lift and tires but i only had the idiot light. After the lift i started seeing the idiot temp light coming on during long uphill grades.
I swapped in a new dash unit with tach and gauges, i also put in new temp and oil sending units to match the new gauges.
When it is 70* or below outside it runs around 210. Above 75* it runs at 210 around town or if i stay below 50 mph. At highway speeds of 65 mph or more it runs at 220 on flat roads and any uphill grade will push it up to 235. turning the A/C off helps but not much. Running the heater keeps it below 235 but it wont take it below 220 unless i get a long down hill. I just did a 200 mile off road trip and even when crawling in 4 low i rarely saw a temp above 215, until i hit the highway.
I have replaced the thermostat and fan clutch. I run a 2 row aluminum rad from Radiator barn, all installed in the last year. All hoses are new and the electric fan works as it should. 50/50 water/antifreeze
At 55 mph i turn 1750 rpm, 65 mph = 2000 rpm and 75 mph = 2250 rpm. all RPM's are when in drive, speeds are checked by GPS as i have not corrected the speedo.
Does this sound like a low rpm issue causing the engine to "Lug" and run hot or can anyone sugest something else?
I am planning on putting the stock tires back on and trying it out. the only other thing i can think of is a plugged catalytic converter but i just passed my emissions test last month. I'm getting ready to build an adventure trailer but i want to solve my temp issues before i add the load of a trailer to it. Any suggestions would be greatly appreciated.