F-150 fan clutch issue: second act
Re: this first thread, today I got a chance to hitch up and try out my new $2700 repair (torque converter, valve body, cooling radiator unit, misc. new clamp, fluids, and gaskets). This was supposed t...
Forum Discussion
Sounds like they never found the root cause...
Sure, they know the four first level flags telling the ECU to turn on the
fan, but do they know what the flow chart looks like for secondary and tertiary flags looks like?
That is in the logic diagram for the ECU, but the root cause can still be
in other areas of the thermal rejection system.
Like plugged to low flow of any of the liquids/lubes/etc to the coolers or
thermal exchanges
A good one suggested is that the TC isn't locking up and leaving the TC
in hydraulic slip, which is normally in the 15% range. Meaning that the
power input to the TC has a lost 15% due to hydraulic shearing inside the TC
Seems that they replaced or took out the TC...what was their report on that?
If me, any time a TC is taken out, replace with a complete rebuilt or new.
Min would be new friction material in it's clutch
I'd now suggest taking the main radiator out and have it boiled out or
flow checked. All three systems of it...assume it has an engine oil and
ATF section in addition to the engine coolant section...
and a BIG ETC...air flow to the various radiators?
Sure, they know the four first level flags telling the ECU to turn on the
fan, but do they know what the flow chart looks like for secondary and tertiary flags looks like?
That is in the logic diagram for the ECU, but the root cause can still be
in other areas of the thermal rejection system.
Like plugged to low flow of any of the liquids/lubes/etc to the coolers or
thermal exchanges
A good one suggested is that the TC isn't locking up and leaving the TC
in hydraulic slip, which is normally in the 15% range. Meaning that the
power input to the TC has a lost 15% due to hydraulic shearing inside the TC
Seems that they replaced or took out the TC...what was their report on that?
If me, any time a TC is taken out, replace with a complete rebuilt or new.
Min would be new friction material in it's clutch
I'd now suggest taking the main radiator out and have it boiled out or
flow checked. All three systems of it...assume it has an engine oil and
ATF section in addition to the engine coolant section...
and a BIG ETC...air flow to the various radiators?
