Running hot while towing.
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Senior User
Joined: Aug 2004
Posts: 139
Likes: 0
From: HERE
Nope, nothing mounted to the front, but I do have an after market grill. I alays had that though and it was nevery an issue.
Thanks for all the replies. You all have given me a lot of stuff to take a look at and I appreciate it. I will update more when I have more info.
Thanks for all the replies. You all have given me a lot of stuff to take a look at and I appreciate it. I will update more when I have more info.
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
Toy hauler is 10k loaded. Tune was written for that load. I do not have the option of going back to stock. Coolant temp was in the 230's.
What is FANVAR? Is that the same as FSS on a scan gauge? The FSS would get to 3500 is at the high temps.
I did replace the cap when I did the cooler. I will see about getting pressure tested and a new cap. Also have a new t-Stat I never installed.
I will check those things before I tear into it.
What is FANVAR? Is that the same as FSS on a scan gauge? The FSS would get to 3500 is at the high temps.
I did replace the cap when I did the cooler. I will see about getting pressure tested and a new cap. Also have a new t-Stat I never installed.
I will check those things before I tear into it.
Cargo Master
Joined: Jun 2007
Posts: 2,723
Likes: 5
From: Roseburg, OR
When I'm loaded at 22k pulling 3 miles of 4% grade my fan will lock up, the FSS will be around 3500 RPMs and the coolant temp never goes over 220°.
Postmaster
Joined: Jan 2005
Posts: 4,424
Likes: 12
From: BC Canada
Yes, the FSS is what you want, FSS should be higher RPMS than the actual RPM to show full engagement. (Crank pulley to fan pulley size comparison, i think they are similar size.) I am thinking oil bypass and water pump from what your saying, the water pump impeller is plastic, you can get an anodized metal one which is probably better. By the sounds of that climb, it should still not exceed about 220 to 225 ECT? So something's not right for sure. I pull on.regular basis with gross combined in the 19,000 to 20,000 in 95 f heat and rarely see over 220, and it always come right down when fan on full, whether in 4, or 5th pulling hills and I am ussually doing 65 to 79 mph on cruise. Good luck but sounds like your gonna have to do some wren in.
Logistics Pro
Joined: Mar 2010
Posts: 3,532
Likes: 491
From: NC
On a 3 mile 7% grade pulling the travel trailer i saw ECT of 225 and EOT of 235, FSS hit 2700, i was going about 45 up the climb, once i crested the ECT dropped quickly. I am also thinking your water pump needs to be replaced.
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
Learn something new every day... never seen fan that high. I pull 8k trailer on 6% grade and never seen higher than 2300. ECT was 217, EOT was 225 last summer.
I think if he's going that deep, I'd change the tstat and check the radiator as well, at a minimum I'd back wash the radiator.
I think if he's going that deep, I'd change the tstat and check the radiator as well, at a minimum I'd back wash the radiator.
Fleet Mechanic
Joined: Nov 2012
Posts: 1,347
Likes: 110
From: Lakeland, Fl
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Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
Like the example above, because the crank pulley is larger than the fan pulley, overdriven, it will spin faster than crank rpm @ 100% lockup if the electronic clutch is working correctly.
Token Redneck
Joined: Jun 2007
Posts: 9,335
Likes: 344
From: Breckenridge, TX
If you're going slow enough some time when the fan clutch is locked pull it down into 3rd. FSS will shoot up and stay there until temps fall back below 210*f(ish). It's a manual way to force the fan to ramp up and cool down faster.
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
Like I said.. learn something new every day, thanks gentleman!
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