2020 Expy Overheating at Highway speeds.

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Calidad

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My 219 does the same. Couple of things 228 and up is not over heating its simply the trigger where dash gives you details. Transmission does the same 225 ish triggers the same display details.

The new lower temp thermostat is one way to reduce the number of times you might see this temp detail displayed. But it doesn’t really add cooling capacity.

Towing heavy in less than ideal temperatures ie hot temps and climbs you see it often and learn to drive accordingly. Also you know your max temp ie whats considered hot vs just a heads up that your above normal etc.

Here’s my observation doing nothing overly unusual or heavy hauling. The temps can spike to 220-225 ie stop and go traffic with only driver in it. Heavy trailer 228-230 in flat stop and go traffic. Thats not over heating but its above normal.

High speed travel pushing 2000+rpm you can definitely see 228+ temps which I’m sure is a product of cooling and limited exhaust capacity causing heat buildup. The HO version gets a better exhaust I suspect that was a must because of this heat buildup issue under hard load with the standard exhaust system.

Here’s the thing. 228-240 isn’t over heating but its not “normal” temp either. Basically you need to consider the situation and decide what to do.

For instance hauling 4 people and some gear at 85mph and you see climbing temps its simple you crack off a tiny bit and let it cool off.

If your towing heavy and those temps are increasing and your still looking at 3000ft of vertical and already in 3rd gear at 2000 rpm and fully expect to be down to 2nd? Temps aren’t stabilizing ie keep climbing then you have choices to make. Pull off let it idle for 15+ minutes or call for a heavier tow rig.

One thing is for sure the non HO exhaust heats up when running at 2000+ rpm. Thats purely a volume issue with the exhaust and turbo combo.

Towing? Yeah 1800-2000rpm is the sweet spot to keep temps stable.

Same for just hauling ass need to cool things off? Get RPMs back down into the 1800-2000 range. OR?? Get some HO exhaust for higher RPM / flow for lower temps.

240 is getting hot but won’t trigger power reduction 250 you’ll trigger power reduction and warnings. I’ve never seen that but have seen 240 right at the top of a 5000ft pass in 100 degree weather, which case I kept going with gravity and speed cooling things off quickly
 

Calidad

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Exhaust flow and turbo play a role in heat buildup. Extended rpm over 2000 definitely gets the heat going. Thermostat will only lower temps on normal load driving. It doesn’t change heat sources and cooling capacity. Unfortunately
 

gslader

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@Calidad - Thanks for the comprehensive write-up; I appreciate you taking the time to share your knowledge. I think the max temp I’ve seen is 244 and haven’t seen any warnings pop-up. To your comment, when it does creep up above normal, backing off the accelerator a couple hundred RPM gets it cooling off after a couple seconds and it usually is back under 230 in 10 seconds or less. The only thing that stumps me is that we’ve had this car for three years and never had this issue until a few months ago and nothing has changed from a driving style, distance, terrain or geographic location perspective. I did replace a leaking coolant line that ran to the heater core and that seemed to coincide with this issue (I think) but the heater works fine, the coolant is full (with the proper coolant).
 

Calidad

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Running it hard 80+ mph which id in that 2000+rpm range seems to heat up the standard exhaust. The HO version got bigger less restrictive exhaust. I would be curious if the exhaust manifolds were different also.

But the exhaust heat thing has been a common thing for many different engines and I’ve seen the RPM 2000+ definitely goes hand in hand with the heat spikes. My guess is that you are also more comfortable driving the car snd are pushing it harder than prior year etc.

Definitely keep the oil changes to 5000 miles or less. With quality synthetic oil. The turbo is really hard on oil life.
 
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