Coolant temperatures while towing

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South VA

K2500 454 Long Roof
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Just checked the XTool site on Amazon. Apparently the AD20 isn't compatible with third party apps. They have a newer version, but it won't work with third party apps either. Guess I need to look around for a new OBD2 dongle.
 

df2x4

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@df2x4 has a 1996 IIRC, and I know he can tune his ECU w/ JET's DST. He may be able to report whether the 1996 ECUs support the AC on/off and aux fan on/off features that I mentioned.

Both of my trucks are '97s, but the PCMs should be similar. I'll check the Suburban tune for those parameters later today.
 

df2x4

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Why don't you use freedom units?

JET DST software defaults to Celsius and to be honest I have no idea if it's even possible to change that.

EDIT - Just checked, doesn't look like it.
 
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South VA

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Here's what I have for AUX fan parameters in my Suburban tune. '97 K1500 Suburban, 5.7L/4L60E, also no AUX fan equipped from factory.

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Thanks for this. If I'm understanding correctly, the aux cooling fan comes on at a hair over 225º F, which is the highest temperature my Suburban reached on the trip to Richmond. It then went down to 221º after a short while. Is it fair to say that the aux fan coming on dropped the coolant temp those few degrees?
 
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