F150 3.5l w\EcoBoost, MaxTow package

Shadow_Grey wrote:

93Cobra2771 wrote:

Tystevens wrote:
I have heard of a few guys w/ over heating issues over on an F150 forum I frequent, but it does not seem to be widespread. The ones who complain (and I don't use that in a derogatory sense) about it say it happens on long slow climbs up dirt roads and so forth.

I have also heard some problems with the fan relay. Apparently there are 3 fan speeds, with a couple relays that make the highest speed kick in. A problem with the relay won't manifest itself until you really need the extra cooling. I know when my max fan kicks on, it sounds like an airplane taking off.

FWIW, I haven't had any overheating issues with mine.

You are correct, I remember the same fan issue cropping up on a few. I've never actually heard mine like you guys are describing while pulling. Mine is an early production 11'.

I will agree with you 93Cobra2771.

I have not had any over heating issues and have towed my 5er in some very hot weather and some long up hill passes over the past 4 years. I have only heard the fan cycle on/off while maneuvering my camper into a spot and even then it wasn't for very long.
What temp thermostat comes stock in these anyway? Maybe those that have problems need to check theirs and put a lower temp one in, make sure the fins are not bent over or check and flush/change the coolant system.

Well, from what I've read, there are 3 speeds. The one you hear that comes on maneuvering around or on a hot day in town is probably the second speed. I don't recall if there is a separate relay for the third high speed or exactly what, but I've only had that one come on while pulling on a hot day. Once that fan kicks in, the upward movement of the coolant temp pretty much stops, and comes back down pretty quickly.

FWIW, it is pretty much the same with my other trucks I've had. The high fan speed on my Duramax was enough to wake my wife up (which is sayin' something).