Coyote cooling help

[Rsnake]

Good evening everyone,
So the roadster has been in go kart stage for about two weeks and have a question regarding the coyote cooling. I have the morosso tank from a 2017 mustang with all the related plumbing like a few others on the forum have used. The car took about 4 gallons of coolant and I made sure to get all the air out. But the fan comes on when the temp hits 180 degrees which seems low, I am using an obd2 scanner to get the temp directly from the computer which is controlling the fan. The motor hits 190 and creeps to 195 at idle but as soon as I drive it's back to 190. The weird thing is the morosso tank gets really hot, too hot to touch but the drivers side of the radiator only gets warm. Not sure if this is normal or am I overthink this?

[edwardb]

Sounds normal to me. With the Moroso tank and the factory plumbing, there's really nothing you need to do to get the air out. It just happens. After the initial coolant fill and a couple heat cycles, top off the expansion tank and you're done. The Mustang system is rated at 15 quarts, so 4 gallons is about right. That's what mine took as well. As far as the fan running, I'm assuming you have the Coyote crate controls pack and are using the fan wire from the control pack. Ford Performance has the PCM programmed to run the fan almost continuously. When I started driving mine, I too noticed how much the fan was running and also used an ODB2 scanner to see the cylinder head temps. Much like you are doing. Seemed to me the fan was running too much so called the support line. They assured me this was on purpose. Said they have not control over the actual engine installations, so have very conservative settings on the fan controller. Basically, once the engine gets any heat in it the fan runs. When I did my custom tune with Lund Racing, I also asked them about this. They said they could change it if I wanted them to, but didn't recommend it. I didn't. Mine also usually runs 190-195 exactly like what you're seeing. Even on a really hot day with extended starts and stops in heavy traffic, like I did last Saturday, it doesn't go over 200. It's a good setup.

[walt mckenna]

Very interesting that Ford decided to run the fan continuously whenever the engine was at operating temperature; possibly warranty related or to keep the engine temperature stable so we're not looking at the gauge all the time. My engine also runs at 195 as long as I am moving. In slow traffic or stopped, the controller will bring the fan on at 205 and turn it off at 195. I like the idea of a stable temperature, but I don't know if continuous fan noise would be an irritant or not.

[edwardb]

...I don't know if continuous fan noise would be an irritant or not.

Can't hear it except while stopped at idle. Even then just barely. And I have relatively quiet GAS-N pipes. It's different, but not an issue.

[Dave Howard]

Sounds like you did a good job of filling and bleeding the air from your Coyote cooling system. It doesn't take much to cause the water pump to be airbound. There's been a few threads over the years on that subject. All your observations are normal. Temps are bang on. The FFR supplied rad is very efficient. I find the ODB scanner temper is 190ish on cool mornings, then 194 as the day heats up.

[Rsnake]

Your responses make me feel much better. I am going to see if the tuner can keep the fan from coming on until 200 degrees since that's normal for a modern engine. Speaking of tuning, when you start your coyote cold does yours retard the timing and thus its very loud for the first 15-20 seconds then as it warms up the timing advances and the sound level goes way down? I was told by ford it's to warm up the cats which I don't have or need.

[edwardb]

When you start your coyote cold does yours retard the timing and thus its very loud for the first 15-20 seconds then as it warms up the timing advances and the sound level goes way down? I was told by ford it's to warm up the cats which I don't have or need.

Yes, mine does that. I wouldn't call it "very loud" but it there is a noticeable change. No big deal at all.


I am going to see if the tuner can keep the fan from coming on until 200 degrees since that's normal for a modern engine.

When a very highly regarded custom tuner like Lund Racing says they don't recommend changing the fan settings, might want to think about this. Also don't know what affect, if any, that might have on your Ford warranty. The Coyote in general is a pretty cool running engine. I rarely if ever, for street use anyway, see 200 degrees. Sure recommend proceeding with caution here. What's the downside of letting the fan run like Ford Performance tuned it?