Has anyone had the fan come on after engine shutdown?

[Artie]

Just as the titles says, parked in garage, power down and get out. I come back a couple minutes later to get something out of the vehicle and all of a sudden the fan switches on full bore, it’s loud enough I almost hurt myself jumping out of the way. It ran for a minute or so before I started the engine again for about 30 seconds and then powered down. The fan remained off after this. First time I’ve experienced this, has anyone else had this happen?

 

[Blackscreen67]

Just as the titles says, parked in garage, power down and get out. I come back a couple minutes later to get something out of the vehicle and all of a sudden the fan switches on full bore, it’s loud enough I almost hurt myself jumping out of the way. It ran for a minute or so before I started the engine again for about 30 seconds and then powered down. The fan remained off after this. First time I’ve experienced this, has anyone else had this happen?

Common built in feature which is often designed to keep cooling fluids post shut down. The coolant pump likely stays on aswell to cool turbos.

Most people that drive turbo charged vehicles have no clue how horrible it is to just drive, park, shut down the engine. Turbo no no 101 that = early turbo failures.

 

[Black]

Yup very common.
The new turbo motors are built to keep cooling for a bit to let the turbos cool after shut down.

The old days one would wire in a turbo timer so keep from damaging them.

 

[Artie]

Common built in feature which is often designed to keep cooling fluids post shut down. The coolant pump likely stays on aswell to cool turbos.

Most people that drive turbo charged vehicles have no clue how horrible it is to just drive, park, shut down the engine. Turbo no no 101 that = early turbo failures.

I’ve read this before and this is my first turbo engine, I just figured since it hadn’t t done it for the 9 months I’ve owned it that it was something it wasn’t gonna do... idk, I figured that was an thing with older turbos. I’m usually pretty easy on the throttle but I did gun it up the hill by my driveway before parking so that was enough to generate enough heat in the turbos I guess. Thanks for the response.

 

[mquick5]

Common built in feature which is often designed to keep cooling fluids post shut down. The coolant pump likely stays on aswell to cool turbos.

Most people that drive turbo charged vehicles have no clue how horrible it is to just drive, park, shut down the engine. Turbo no no 101 that = early turbo failures.

Well what is the proper shut method?

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[JExpedition07]

Let it idle a little before shutdown.

 

[Artie]

Does the 2018 3.5 ecoboost have separate reservoir for the turbos or is it all the same cooling system as the engine?

 

[Blackscreen67]

Does the 2018 3.5 ecoboost have separate reservoir for the turbos or is it all the same cooling system as the engine?

No, it's a full system flow.

The center sections are journal bearings which essentially free float on incredibly thin layer of oil.

The coolant helps cool this center section, which assists the cooling of the oil.

What happens when a really hot turbo is shut down results in cracked CHRA(the main bearing section of a turbo) cracked exhaust housings, also can flash burn a bearing since hot oil is very thin. Remove new cool oil flow quickly, and you just cooked your turbo.

Good rule of thumb is 3mins cool down prior to shutdown.

I've even trained my wife to do this. She understands not to drive heavy til the engines up to temp as well.... the twin turbo X6M was her daily before I got her the expedition.

She and I are a match made in twin turbo heaven.

 

[Artie]

No, it's a full system flow.

The center sections are journal bearings which essentially free float on incredibly thin layer of oil.

The coolant helps cool this center section, which assists the cooling of the oil.

What happens when a really hot turbo is shut down results in cracked CHRA(the main bearing section of a turbo) cracked exhaust housings, also can flash burn a bearing since hot oil is very thin. Remove new cool oil flow quickly, and you just cooked your turbo.

Good rule of thumb is 3mins cool down prior to shutdown.

I've even trained my wife to do this. She understands not to drive heavy til the engines up to temp as well.... the twin turbo X6M was her daily before I got her the expedition.

She and I are a match made in twin turbo heaven.

Thanks for the info. I’m religious about taking it easy from start up to about 175° trans temp, that’s the only actual readout gauge I have but I’m pretty sure that’s a safe temp by that point. Upon shutdown I usually sit for 40 seconds to a minute but that’s not always possible sitting with two kids in the car. I guess it’s f there is a failure that’s what warranty’s are for but that won’t be much comfort if I’m on a vacation or something.

 

[Blackscreen67]

Thanks for the info. I’m religious about taking it easy from start up to about 175° trans temp, that’s the only actual readout gauge I have but I’m pretty sure that’s a safe temp by that point. Upon shutdown I usually sit for 40 seconds to a minute but that’s not always possible sitting with two kids in the car. I guess it’s f there is a failure that’s what warranty’s are for but that won’t be much comfort if I’m on a vacation or something.

Nah your safe.... that's what the after shutdown system is there for!

 

[JohnT]

It's more of a concern after a heavy load, towing or hard driving to shutdown straightaway. Pootling along in the residential area up to your house? Shut it off straightaway, you're fine.

Urgent need for a bathroom break after heavy driving uphill after passing those two semis that were elephant racing for the last 30 miles? Shutdown jump out lock and remote start.

 

[edizzle]

It's more of a concern after a heavy load, towing or hard driving to shutdown straightaway. Pootling along in the residential area up to your house? Shut it off straightaway, you're fine.

Urgent need for a bathroom break after heavy driving uphill after passing those two semis that were elephant racing for the last 30 miles? Shutdown jump out lock and remote start.

Or just jump out and lock!

 

[NASCAR Mike]

Modern day synthetic oil is much more resistant to coking than dino oils of the past. I always take it easy on the last 2 miles of my trips to help lower the temps but I am not concerned with the oil cooking because I use synthetic oil.

 

[jeff kushner]

Well what is the proper shut method?

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I have a factory turbo'ed bike that I made a couple of small changes to and now I run 18psi with the 2nd safety set at 22psi. I run this bike hard for it's "shot out of a cannon" feelings....I'm not shy about winding it up on my early morning rides but I always include a ten minute cool down period of gentle riding to let the air & oil cool things down before pulling into my garage. Turbos spin fast....I mean REALLY fast as in 212,000rpm and yes, you read that correctly. Turbos also get very hot....hot enough to begin turning color at full boost so what was said about proper shutdown is not in vain.....he is very correct. Ford has tried to mitigate the results of normal driving which includes hot shutdowns by continuing to operate part of the cooling systems after shutdown.



jeff

 

[Mike Wolfe]

Modern day synthetic oil is much more resistant to coking than dino oils of the past. I always take it easy on the last 2 miles of my trips to help lower the temps but I am not concerned with the oil cooking because I use synthetic oil.

Ya I use "FULL" synthetic oil as well stable at 100 degrees F higher than synthetic blends

 

[Artie]

I have a factory turbo'ed bike that I made a couple of small changes to and now I run 18psi with the 2nd safety set at 22psi. I run this bike hard for it's "shot out of a cannon" feelings....I'm not shy about winding it up on my early morning rides but I always include a ten minute cool down period of gentle riding to let the air & oil cool things down before pulling into my garage. Turbos spin fast....I mean REALLY fast as in 212,000rpm and yes, you read that correctly. Turbos also get very hot....hot enough to begin turning color at full boost so what was said about proper shutdown is not in vain.....he is very correct. Ford has tried to mitigate the results of normal driving which includes hot shutdowns by continuing to operate part of the cooling systems after shutdown.



jeff

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Turbo bike? I don’t think I’m manly enough to ride something that nuts hahaha. I bet your forearms are strong from holding on to that thing.

 

[jeff kushner]

Turbo bike? I don’t think I’m manly enough to ride something that nuts hahaha. I bet your forearms are strong from holding on to that thing.

Thanks Artie but you'd be fine. My finance has actually ridden it more often than I have over the past 6 years but she's never engaged the boost! Not once! She only weighs 140 so she doesn't have to. She has a '73 CB350G(restored) and an '86 GS450 but she's very gentle and doesn't like to go fast and I'm good with that.... I don't worry as much.

Turbo bikes, at least the original factory Japanese bikes all had a "safety" for newcomers....the boost doesn't build till 4,200 or so(incl the CX)and even above that, as long as you don't open the throttle vast amounts more than the engine requires, boost is never built so it's a way to stay slow.

jeff