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Looking for feedback from members using OBDII Scan Gauges (i.e., Aeroforce, PLX, etc) to monitor water temperature. Why just scan gauges? Trying to compare apples-2-apples (or as close as possible) to how I monitor my water temp (which I use the PLX OLED OBDII scan gauge). The 2005+ Mustang GT does NOT have a H20 temp sensor. Rather, the GTs are configured with a CHT (Cylinder Head Temp) sensor. The 2005+ 4.0L V6 has an ECT (Engine Coolant Temp) sensor which is mounted in an actual coolant passage. The issue with ECT sensor equipped vehicles is that an accurate reading of CHT cannot be obtained (important for fuel economy and emissions). The 2005+ 4.6L GT is equipped with a CHT sensor, no ECT. The CHT is mounted into the wall of the cylinder head and is NOT connected to any coolant passages… the PCM uses algorithms to ‘interpret’ water temp readings.
Anyway, here’s the issue… My cooling fan does not kick on until water temp (per my OBDII scan gauge) reaches 215F… it will run until temp drops to 202F, then shuts off. Others have indicated that the low-speed fan should kick on around 200F, and drive temp down to 192F. I took it into my local Ford dealership service, and they advised my cooling fan is “operating within spec and cycling within parameters” (stating fan engagement is based on various PIDs, not just water temp). If anyone is willing to run a quick observation on their vehicles, I’d like to know at what temp your cooling fan engages. I simply had the car idling in the driveway and waiting for cooling fan to kick on.. then observed gauge water temp. Then as temp dropped, noted at what temp cooling fan turns off. (again, mine turned on at 215F… and turned off @ 202F. Thus my temps consistent run 200+ , and up to 230F when under load)… this seems too hot. I appreciate any/all input.
(1) At idle, my cooling fan turns on under 200F
(2) At idle, my cooling fan turns on between 200F – 214F
(3) At idle, my cooling fan turns on at 215F +
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Ok so a lower rated T-stat (160 vs. 180) will open at a lower temperature, so the engine will run cooler with one? This is how I understand it, just looking for confirmation.
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Whipple @ 9 psi - 445rwhp/400rwtq - 12.07 @ 118.7 mph
Steeda sport springs - Steeda strut mounts - Steeda TriAx- Steeda Adjustable Panhard Bar - Steeda Axleback - D-Spec shocks - J&M LCAs - FRPP 4.10s - GT500 spoiler -
And probably more I can't remember
All work done by owner
Ok so a lower rated T-stat (160 vs. 180) will open at a lower temperature, so the engine will run cooler with one? This is how I understand it, just looking for confirmation.
Correct....once a certain temp is reached it will mechanically open or close depending on the temp thermostat your using.....you can adj when the fans come on too and if running big HP or doing something that creates alot of heat -you can run the fans all the time.....I have read some that do that sure this is achieved with a tuner...I know mine adj mine.....I never get to the "halfway" mark on the dummy OEM gauge and it sits usually between the 10 or 11 o'clock position on the gauge (12 being middle).
Heat robs power! Esp. with a TS S/C!
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2006 Mustang GT with Cervinis Kit
Whipple Crew member
H.O. S/C 465 RWHP and 440RWTQ
You need to be carefull when you start messing with operating temps. An aluminum engine needs to run at a temp that ensures thermal efficiency. The computer also looks at temps to increase and decrease timing. In the old days we could run at a lower temp and add timing to compensate. Unless you do this with a custom tune I would not mess with changing thermostats. GA
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05 GT GT500 conversion, Techco 428hp/396tq, Tillman tune. Hooker Super Comp LTs, Pypes HF cats, Steeda: Sport shifter, Front relo kit, HD strut pads. BMR: lowering springs, adj 3rd link, phb, rear relo brackets. Stillen adj front and rear sway bars. GT 500 18x9.5 wheels. GT500 14" Brembos, GT500 front lower control arms. Tokico D-specs
You need to be carefull when you start messing with operating temps. An aluminum engine needs to run at a temp that ensures thermal efficiency. The computer also looks at temps to increase and decrease timing. In the old days we could run at a lower temp and add timing to compensate. Unless you do this with a custom tune I would not mess with changing thermostats. GA
Yet another reason to have a custom tune or know what your doing!
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2006 Mustang GT with Cervinis Kit
Whipple Crew member
H.O. S/C 465 RWHP and 440RWTQ
I talked with brenspeed about changing the tune for the 160 T-stat, said no change needed. I put it in, changed the fan temps and never had any issues.
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POLL: GT water temps & cooling fan
