over heating
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GLE Exclusive 2020
over heating
Was in town for a 3 mile run. Waited for the wife a few minutes with the car running, ran another few miles, left my wife in the car running while I picked up a script (5 minutes) got back in the car and within a mile the temp warning came on. I felt the car was breaking everytime I left off the gas put I thought that was the battery recovery going on. Any one have similar experience?
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From: Colorado
'21 AMG53 wDPP & ARC, 19 GLC300 - Former-03 C240,2 ML BlueTecs,20 GLE450 E-ABC,15 Cayenne D,17 Macan
I wonder if the 48v water pump, or a sensor driving it, has gone goofy on you. Or the sensor showing the temperature.
The pump is designed to be "situational, i.e. running twice a fast as a belt-driven pump when needed, or idling along when heat load is low. In addition to saving energy when not needed, it allows the engineers to design a more "power dense" engine.
Usually "flashing" means park it right away, and steady means OK but keep watch. Not sure if this applies to all warnings, though.
The pump is designed to be "situational, i.e. running twice a fast as a belt-driven pump when needed, or idling along when heat load is low. In addition to saving energy when not needed, it allows the engineers to design a more "power dense" engine.
"Electric water pump: doubling the maximum pump output (approx. 950 watts rather than 400 watts) increases the cooling performance. This allows a higher engine power density. It is often also possible to save energy by situation-related actuation of the pump irrespective of engine speed." from https://media.daimler.com/marsMediaS...l?oid=22934110
Was the warning flashing or constant?Usually "flashing" means park it right away, and steady means OK but keep watch. Not sure if this applies to all warnings, though.
Last edited by mikapen; Oct 24, 2020 at 06:38 PM.
Thread Starter
Junior Member
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GLE Exclusive 2020
It had a Constant warning light. It's happened 2 times. Both times with me waiting in the car with the AC on. I'm just wondering how this works on the cooling system. The car shuts down, but the electric water pump keeps working or also shuts down at a ceratin point.
MBWorld Fanatic!
Joined: Oct 2009
Posts: 7,073
Likes: 2,221
From: Colorado
'21 AMG53 wDPP & ARC, 19 GLC300 - Former-03 C240,2 ML BlueTecs,20 GLE450 E-ABC,15 Cayenne D,17 Macan
It had a Constant warning light. It's happened 2 times. Both times with me waiting in the car with the AC on. I'm just wondering how this works on the cooling system. The car shuts down, but the electric water pump keeps working or also shuts down at a ceratin point.
Regarding the water pump continuing after shutdown - there are so many things going on under there that it can be hard to tell what's actually making sounds. I know that turbos receive continuous oil circulation until they've cooled enough to prevent coking, and then there's the machinations of the air suspension and probably other things going on.
