Well, that crappy whining that we've been experiencing since October has finally come to a head. It's the heater blower motor. Here's the big question: Could this cause, for any reason, the car to run a touch hot on the oil side? Coolant temp stays pegged dead center on the gauge, but oil swings from around 190/200f (what I'm used to) up to around 225f. Would this heat cause oil "burn"? My level went scary low, and my oil pressure light came on when the oil temp raced to 250f. Yes I shut off the car. After I let it cool down, added a qt of 5/30, all was ok. It just doesn't like hot, in town driving right now. And I'm sure it's the blower motor, because it's only on when the climate control is on in auto mode. Not a cooling fan issue, I don't believe. Luckily, my guy can swap this out for $120 labor, and no part markup, so I'm looking @ $300. I figure I might as well run Sea Foam through the car, and have him do my oil change while he's got it. Yeah I usually change my own - but with a new baby, and a major house project. . . you know how it goes. Any other opinions?

 

There really should be no link between the blower motor and engine temperature. Of course, running the heater could pull some heat off the coolant system, but it won't be significant. Bottom line is the vehicle should run at normal temperatures regardless of whether the heater is running.

My temperature guage sits in the middle after it warms up. The oil temperature runs around 200-225o but high speed (80-90 mph) runs in hot weather can drive it to almost 250o, then it cools back down. Been like this for the last 4 years and 100k miles.

 

Turns out, it's not the blower motor, grrrr. It's the aux cooling fan right up front. I just didn't look throughly enough before I spouted off the question. Same issues, same questions, just replace blower motor with aux coolling fan. Could this be the cause? Should this be lubed / replaced? I need help finding the part also.