Soooo, weirdest thing. I replaced the pressure switch and tstat I got from Ford and at first not any real changes. Coolant was slightly backing up in overflow, fans were still on. Then I drove around a bit and it got slightly warmer, I monitored temps on my scanner and it climbed to around 150. I'd say about 1/4 of the way above cold on the dash gauge. Then I parked, shut car off, turned key back to ignition, let gauges sweep, and then noticed the temp gauge stopped at the middle like normal, so I started car and it stayed right at the middle where it's supposed to be. Scanner read 203 degrees. At this point I'm sure it's a sensor issue. Just which one. I do believe ect sensor because on my first drive the ect's would drop drastically as I hit the gas and rise just as fast as I let off. I don't think it's supposed to move around that fast. Even in the boiling water test the ohms of the ect sensor was dropping rather fast and I believe it supposed to drop ohms slowly. I'll replace ect sensor tomorrow. Also, I noticed on my scanner my ambient air temp stuck at like -32 degrees for a long time then jumped to -27 degrees and stayed there. Maybe my air temp sensor is bad as well? And for the fans staying on, could my tune be doing that trying to keep my engine as cool as possible?

You have a tune on there?  Did not realize that, thought you were stock (from your signature).  Argh, a-s-s-u-m-e ...

Yes, if the tune has the fan behavior changed, they can come on earlier and stay on longer.  Not sure of the cutoffs though.  They should not be coming on before the TStat opening point, but your tuner can confirm details.

You should return to stock and confirm what problems still remain....You shouldn't tune a car that has even a single mechanical problem known...You only post when you have mechanical problems and they are frequent! I can't believe you still have it! It just seems like issue after issue I honestly have never seen anything quite like it

You should've had the car vacuum bled when you did your thermostat as that's how the ford service manual usually says to change a thermostat correctly...Others here have done it without vacuum bleeding but some luck may be involved.

Quote from: SHOdded on December 28, 2016, 12:55:20 AM
You have a tune on there?  Did not realize that, thought you were stock (from your signature).  Argh, a-s-s-u-m-e ...

Yes, if the tune has the fan behavior changed, they can come on earlier and stay on longer.  Not sure of the cutoffs though.  They should not be coming on before the TStat opening point, but your tuner can confirm details.

Yea. I'll change my quote and I'm gonna have to confirm with my tuner.

Quote from: AJP turbo on December 28, 2016, 01:08:12 AM
You should return to stock and confirm what problems still remain....You shouldn't tune a car that has even a single mechanical problem known...You only post when you have mechanical problems and they are frequent! I can't believe you still have it! It just seems like issue after issue I honestly have never seen anything quite like it

You should've had the car vacuum bled when you did your thermostat as that's how the ford service manual usually says to change a thermostat correctly...Others here have done it without vacuum bleeding but some luck may be involved.

I cant believe I still have this car too. And I didn't tune it with issues. I tuned it after I got a new engine trans and pcm (hence why I won't get rid of it). And I never knew that about getting vacuum bled while doing tstat change. I only let out enough coolant to swap it. Didn't drain the whole system or nothing but I'll look into that and do it the correct way. Do u have the procedure handy?

This TStat related HOWTO thread is worth reading through:
http://www.ecoboostperformanceforum.com/index.php/topic,2280.0.html

How to eliminate air pockets
http://www.ecoboostperformanceforum.com/index.php/topic,2280.msg56469.html#msg56469

OH MY,OH MY is right!!. Z

Quote from: ZSHO on December 28, 2016, 07:35:26 AM
OH MY,OH MY is right!!. Z

Right!  Lol. Side note: Hope u and everyone else had a merry xmas!!

Quote from: Flexthis2011EB on December 28, 2016, 10:04:07 AM
Side note: Hope u and everyone else had a merry xmas!!

'twas peaceful and aglow

Quote from: SHOdded on December 28, 2016, 10:20:55 AM

Quote from: Flexthis2011EB on December 28, 2016, 10:04:07 AM
Side note: Hope u and everyone else had a merry xmas!!

'twas peaceful and aglow

Awesome!! Good to hear!

Ok so here's what going on. Drive car to work this morning, 20 miles. Everything was just fine. Temp was normal (fans were still on but didn't stop it from reaching op temp). Only thing is now when I stopped the fans were on full blast. I know it does that when cooling the engine after a long drive but this is longer than normal. I think there's a problem in the fan circuit. I'm going to pick up some resistors on my way home and test it using the diagram.

Did you check the coolant reservoir to make sure its full preferably a hair above the top fill line and also try letting some air out from coolant tank. Z

Um, so I returned my tune to stock and everything went back to normal. Warms up perfectly, fans don't come on on start up. I guess it's time to email my tuner.

Quote from: Flexthis2011EB on December 28, 2016, 05:22:46 PM
Um, so I returned my tune to stock and everything went back to normal. Warms up perfectly, fans don't come on on start up. I guess it's time to email my tuner.

Definitely. Sounds like they made some changes to the fan control that were not asked for/are causing problems. Do let us know what they say.

He returned fans back to stock and they still run. Someone said something about an expansion valve causing similar symptoms. Do we have this and where would it be located?