Administrator, Resident Tater Salad
The Cruze runs between 219-225F in normal operation. Climbing a hill or putting a heavy load on the engine will open the thermostat and drop temps to 201 or so. Fan kicks into high at 230F; runs on low or medium speed with A/C on, depending on high side pressures at the condensor.Engine overheating is a possible symptom of fan inoperation in particular in city driving.
Was originally proposed on FWD vehicles to put a cam gear driven right angle fan that would always rotate when the engine was running, naw, lets go electric instead. Worse case cooling occurs when the alternator is least capable of producing a large enough output current to run this fan. When the engine is at idle and stalled in traffic.
Sure a lot of effort was put into fan control when the absolute HP even the largest engine could consume was far less than a half a HP. But this is what happens when you have idiots in charge, like a disease. Guess they never heard of the windmilling effect when driving at any speed at all.
But after over 125 years of the IC engine using more than 85% percent of its energy to heat up the atmosphere rather than make the vehicle go someplace, like to pick on the fan. Talk about making mountains our of molehills, prime example. And really a major disaster today with aluminum and plastic under the hood.
Another really stupid thing was using the engine ECT to control the fans, not bad on the highway, but in city driving, would get thermal cycling between 195 to 235*F with an aluminum head on a cast iron block that has seven times the expansion rate causing head gasket problems. Least this was cured on the Cruze, but not sure why at 221*F/25 psi pressures, so you are wondering why this car has so much cooling problems. Along with that fan.
I've never seen an alternator have a problem running the fan at idle on ANY car. Yeah, it makes the little 1.4 chug a little harder, but it's perfectly capable of producing the power. If anything, the fanbelt driven cars we've had were even more prone to overheating in traffic than the electric fan cars.
And the radiator is so massively oversized on these tiny little engines that it's rare that it even needs the fan.