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post #1 of 12 Old 09-07-2012, 03:42 AM Thread Starter
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Options for reducing coolant overheating?

What should I consider modifing on the truck to address coolant overheating? I have added a mini maxx and deleted the DPF & CAT. Will adding an S&B intake significantly lower temps particularly coolant temp?

Last week I towed my 12k lb fifth wheel through some small hills driving from Del Rio to Rocksprings, Texas. This was my first time towing after DPF/CAT delete. When going uphill at around 70 mph in 5th gear EGTs reached 1200 and coolant temp increased to 220 and tuner alarmed and defueled. When going uphill at around 60 the trans stayed in 4th gear, EGTs stayed around 1000 and coolant temp stayed in the 210 - 215 range. The trans temp stayed around 190 - 200. What improvements can be made to the truck to reduce coolant temperature when towing while maintaining speed at 70 mph?
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post #2 of 12 Old 09-07-2012, 03:47 AM
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What was the delta between your coolant and oil? Did the temps come down quickly once you were on the way down the hills?

08 F350 JOB 1
H&S MINI MAXX HD300 W/S1M
SINISTER EGR/COOLER DELETE
6000K BEAMERS HID HEAD & FOGLIGHTS
KMC XD WHEELS W/NITTO TRAIL GRAPPLERS
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post #3 of 12 Old 09-07-2012, 04:34 AM
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what tune were you running?

08 F250 KR
08 F250 XL
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post #4 of 12 Old 09-07-2012, 06:37 AM
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220 isn't very hot. The fan doesn't come on until 222. I was told by ford that these things will run up to 230 water and 245 on the oil before they trip a check engine light. New diesels run hot. Real hot.

2010 F350 Crew Cab Long Box
Spartan , S&B Intake 3.55
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post #5 of 12 Old 09-07-2012, 06:51 AM
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Like stated above 220 is not hot. Mods that will help reduce egt's are an egr delete with intake elbow, CAC pipe and a downpipe.

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #6 of 12 Old 09-07-2012, 02:39 PM Thread Starter
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The oil temp was about 10 degrees less that the coolant temp. Yes, the temp. went down quickly when going downhill and stopped alarming on the tuner. I was running the Mild tune at the No Power level. Sounds like the defuel set point on the tuner should maybe be raised to around 225.
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post #7 of 12 Old 09-07-2012, 06:35 PM
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Quote:
Originally Posted by jkypuros View Post
The oil temp was about 10 degrees less that the coolant temp. Yes, the temp. went down quickly when going downhill and stopped alarming on the tuner. I was running the Mild tune at the No Power level. Sounds like the defuel set point on the tuner should maybe be raised to around 225.
I think the defuels go up in increments of 10 so 230 would probably be fine. It could have just been a combination of things that caused it the go up to 220 - outside temp, speed, incline etc. If it came back down quickly then I wouldn't be to concerned becaquse it means the cooling system is doing it's job. If it was to stay high for awhile then I would be concerned. Also did you mean the oil was 10 deg. higher? Usually the oil is anywhere from 4-6 degrees higher than my coolant normal driving and 6-10 difference towing.

08 F350 JOB 1
H&S MINI MAXX HD300 W/S1M
SINISTER EGR/COOLER DELETE
6000K BEAMERS HID HEAD & FOGLIGHTS
KMC XD WHEELS W/NITTO TRAIL GRAPPLERS
2.5" LEVELING KIT
DIESELSITE COOLANT FILTER
ROTELLA EC-1 RATED COOLANT
5" DP BACK FLO-PRO EXHAUST
FLO-PRO CAC PIPE & INTAKE ELBOW
CCV MOD
AIR LIFT 5000LB AIR BAGS W/ONBOARD COMPRESSOR
AFE CAI
PMF TRACTION BARS
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post #8 of 12 Old 09-07-2012, 07:23 PM
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yeah i would check the cooling system including the tstats. usually oil temp rises with coolant. how many miles on the truck?

08 F250 KR
08 F250 XL
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post #9 of 12 Old 09-10-2012, 07:37 AM
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Quote:
Originally Posted by jkypuros View Post
What should I consider modifing on the truck to address coolant overheating? I have added a mini maxx and deleted the DPF & CAT. Will adding an S&B intake significantly lower temps particularly coolant temp?

Last week I towed my 12k lb fifth wheel through some small hills driving from Del Rio to Rocksprings, Texas. This was my first time towing after DPF/CAT delete. When going uphill at around 70 mph in 5th gear EGTs reached 1200 and coolant temp increased to 220 and tuner alarmed and defueled. When going uphill at around 60 the trans stayed in 4th gear, EGTs stayed around 1000 and coolant temp stayed in the 210 - 215 range. The trans temp stayed around 190 - 200. What improvements can be made to the truck to reduce coolant temperature when towing while maintaining speed at 70 mph?
Questions:

What tune are you running? with 12K suggest No Power

Out side Air temp???? 100*?

Small hills? highway grade 3-5%? how long miles or mile or two?

Air Filter clean???

Trans filter clean oil changed?

EGR installed or deleted?

Good radiator cap ( No puking)?

8K behind mine running the hills in the badlands (10 mile climbs) EGT hit 1200 in OD at 65, dropped a gear and all was controlled at 1150 at 60mph. Coolant never got much above mid range. Imonitor EGTs not coolant driving. I use the OEM coolant gauge.

2008 F450 King Ranch 4X4
H&S Tunes
5" down pipe back exahust
4.30 L/S gears
AFE CAI
265/70R19.5 Michelins
Pure performance 4 link front suspension
Kelderman Air-Ride
FASS fuel filter
PTP EGR Delete
Train Horns under the front bumper
2013 Radio/Nav/sync upgrade


494Rwhp/975ftlbs......

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post #10 of 12 Old 09-11-2012, 07:49 PM
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I'b be ditching the factory intake the first chance you get...very restrictive!

2013 GMC Denali: PPEI H&S, Edge, AFE, S&B, Wherli, HSP, DRP, AirDog, Gear Alloy, Toyo
2010 F-350 Lariat: H&S, Flo~Pro, Sinister, S&B
(SOLD)
2012 F-250 KR: H&S, MBRP, Sinister, S&B, 315/60/20 Toyo MT
2008 F250 Job 2: H&S mini, MBRP 5in, S&B, PTP EGR
2009 Dodge: H&S, Flo~Pro, S&B, GDP, Shibby,
2009 LMM: EFI Live(DSP 5), 5in MBRP, EGR blocked
2006 LBZ: MBRP t/b 4in exhaust,PPE Xcellorator,PPE Air Box Mod,Rancho 4in
2007 LMM Z71
2002 LB7: T409 MBRP Duals,Banks CAI,PPE Boost Valve, Hypertech
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