Can't get low-speed temps down.
Recovery Vehicle
Joined: May 2009
Posts: 1,191
Likes: 28
From: Charlotte, NC
I think you'll get the results your seeking with the inline thermostat mod. It's an easy job and once you see the new temps you won't go back. I didn't get above 185-186 ever again with that set up. With your new parts you're probably going to be in that range also.
Recovery Vehicle
Joined: Feb 2019
Posts: 1,222
Likes: 595
From: Jacksonville, FL
I think you'll get the results your seeking with the inline thermostat mod. It's an easy job and once you see the new temps you won't go back. I didn't get above 185-186 ever again with that set up. With your new parts you're probably going to be in that range also.
Recovery Vehicle
Joined: Jun 2018
Posts: 1,235
Likes: 509
From: CA
Did you check the old fan assy with a heat gun? Does the pin turn? Is there a change in resistance when spinning?
You should test the new fan assy the same way too, maybe it is faulty.
The clutch has mainly an effect on idle temps. Is there a change at all (with A/C fan off)?
You should test the new fan assy the same way too, maybe it is faulty.
The clutch has mainly an effect on idle temps. Is there a change at all (with A/C fan off)?
Winching
Joined: Feb 2018
Posts: 569
Likes: 43
From: Orlando FL
I wasn't a believer at first but my OEM cooling system with 180 stat runs 185 down the hwy. Maxes out about 194 sitting in bumper to bumper traffic in 95 degree heat and even then cycles between 185 and 194.
It took me 2 WEEKS of topping off at the bleed screw first thing in the morning before the sun even warmed up the hood of the truck.
There were several days where not more than a teaspoon went in and I was convinced I was wasting my time.
Then kind of out of nowhere I noticed my temps considerably lower.
I firmly believe that the difference between 200 at idle and 185 at idle is less than a cup of water or an air bubble of that size
It took me 2 WEEKS of topping off at the bleed screw first thing in the morning before the sun even warmed up the hood of the truck.
There were several days where not more than a teaspoon went in and I was convinced I was wasting my time.
Then kind of out of nowhere I noticed my temps considerably lower.
I firmly believe that the difference between 200 at idle and 185 at idle is less than a cup of water or an air bubble of that size
Pro Wrench
Joined: Oct 2011
Posts: 1,709
Likes: 137
From: NE PA
I wasn't a believer at first but my OEM cooling system with 180 stat runs 185 down the hwy. Maxes out about 194 sitting in bumper to bumper traffic in 95 degree heat and even then cycles between 185 and 194.
It took me 2 WEEKS of topping off at the bleed screw first thing in the morning before the sun even warmed up the hood of the truck.
There were several days where not more than a teaspoon went in and I was convinced I was wasting my time.
Then kind of out of nowhere I noticed my temps considerably lower.
I firmly believe that the difference between 200 at idle and 185 at idle is less than a cup of water or an air bubble of that size
It took me 2 WEEKS of topping off at the bleed screw first thing in the morning before the sun even warmed up the hood of the truck.
There were several days where not more than a teaspoon went in and I was convinced I was wasting my time.
Then kind of out of nowhere I noticed my temps considerably lower.
I firmly believe that the difference between 200 at idle and 185 at idle is less than a cup of water or an air bubble of that size
Winching
Joined: Feb 2018
Posts: 569
Likes: 43
From: Orlando FL
Actually that did do anything for me. and I was on a pretty steep hill LOL
Recovery Vehicle
Joined: Jan 2011
Posts: 1,170
Likes: 300
From: StL, MO
i do this but also take out the bleed screw and then unhook the coolant reservoir and raise it until fluid comes out the bleed screw. quickly replace the bleed screw and put the coolant reservoir back in place. i have never had an issue with air bubbles doing things this way.
Recovery Vehicle
Joined: Feb 2019
Posts: 1,222
Likes: 595
From: Jacksonville, FL
Pulled the stat and put in a genuine 180 stat. Flushed all the coolant out. Running with water and purple ice - no coolant.
Before
idle - 210 to 215
1500 rpms - 210 to 224
2000+ rpms. - 204 to 212
After
idle - 194
1500 rpms - 183 to 188
2000+ rpms - 179 to 183
Fixing the exhaust leaks tomorrow!
Before
idle - 210 to 215
1500 rpms - 210 to 224
2000+ rpms. - 204 to 212
After
idle - 194
1500 rpms - 183 to 188
2000+ rpms - 179 to 183
Fixing the exhaust leaks tomorrow!
2004 D2, 144k miles.
New: Radiator, Water pump, Hoses & Pipes, 180 degree Thermostat, Fan & Fan Clutch, Flushed and Filled with Prestone Green plus Water wetter.
These temperatures are from my Ultra Gauge, without the AC on, and outside temperature between 65 and 80 degrees:
I feel the low speed and idle temperatures are too high and from what I’ve read here in the forums, I shouldn’t be seeing 200+ at all given what I’ve done.
The odd thing is, if I’m at a light and the temps get into the 210+ range, if I put the truck in neutral and rev it to around 2000 RPM’s, the temperature goes down immediately to the low 190’s. Could this be a coolant circulation problem?
Thoughts and input appreciated.
Thanks.
New: Radiator, Water pump, Hoses & Pipes, 180 degree Thermostat, Fan & Fan Clutch, Flushed and Filled with Prestone Green plus Water wetter.
These temperatures are from my Ultra Gauge, without the AC on, and outside temperature between 65 and 80 degrees:
- Highway: 185 degrees
- Neighborhoods: 200 degrees
- Idling for more than 10 seconds: >210
I feel the low speed and idle temperatures are too high and from what I’ve read here in the forums, I shouldn’t be seeing 200+ at all given what I’ve done.
The odd thing is, if I’m at a light and the temps get into the 210+ range, if I put the truck in neutral and rev it to around 2000 RPM’s, the temperature goes down immediately to the low 190’s. Could this be a coolant circulation problem?
Thoughts and input appreciated.
Thanks.
