What during an alternator replacement would cause the engine to overheat?

[Tommy Z]

Originally Posted by pmax

Either the fan's rotating in "lockstep" with the engine or the belt's squealing.

Something else is the cause of the overheating.

I hear you. I’m just going to have to keep an eye on it. Strange though why it didn’t happen on my test drive post tension adjustment.

[Tommy Z]

Originally Posted by Klax

What oil are you running? I've been using VR-1 20-50 for years and I think it runs hotter than the synthetics I used to use.

I'm growing more convinced that the air here in Colorado is just different, meaning far more variable in temp and humidity level than our friends at/near sea level, and that can cause fairly large swings in running temps from day to day and elevation to elevation. A quick weather check says 36% humidity today vs 9% yesterday. When I lived in Ohio, my car never, never, made it to 9:00 on the gauge, but here I'm always above 9:00 and approaching 10:00 in summer unless I'm coasting down the mountain.

Hi Kevin, I'm running Motul 20W-50 year round. I'm nervous about running synthetic in mine. I already have a small oil leak and not keen on seeing it get any bigger. Took it out again today and she ran a little hot but not like the other day. The needle was just a fraction above the 9:00 mark on the dial.