OK, so question for you guys. I pulled the grille off and the upper cowl to spend some time with a pressure washer in there. I noticed after I turned the fan by hand quite a few times the resistance goes away, but returns after it sits for a bit.
Running hot
- Thread starter danzick
- Start date
Had problems with mine overheating and the problem was the fan clutch. When it heated up I never could hear mine kick in. there was also oil around mine. Sign of internal leak.
Normal. There is a viscous fluid that activates the clutch. When stop it puddles it lowest point.. Untill spun.. Same thing happens when you shut the engine off then start it up next day.. Fan is on untill it gets the fluid spread around... Then disengaged untill air temps engages it..
Good to hear. I always wondered why the fan was engaged when I took off when it was cold. Got it all pressure washed up. It looked fine, but hopefully it helps. I don't understand why when it was getting hot in the high 220's to 230 the factory gauge barley even moved above 210.
That's an easy answer. GM felt people would get to concerned if they actually knew what the truck was running for temp. Connect up a scanner, and you will find the gauge reads roughly 200-210 from 170 all the way up to about 225-230, then it starts reading semi closely. And GM wasn't the only one who did this. FORD started it way back in the 80's with there oil pressure gauges. They used an off on switch for the gauge, once it hit about 7-8 PSI it went to the mid point and stayed there until it dropped below 5 PSI.
Ah. I see. Sometimes I wonder if people actually know what temps their rig runs at. When I was at 230 just looking at the factory gauge I would have guessed 215 220 max.
Most don't have a clue but GM claims 240 constant temp is ok. By 238-240, oil temps are hitting 260 and I back out of it. I don't hit those temps in 75* weather though
So is there any problems running it without the upper grille cover thing? My knee fell through it a year back or so and its pretty busted up. I see some guys run without it.
Ah, i wondered if it would cause a disturbance in the air flow. Ill put it back on. Headed for another trip for labor day weekend. A couple pretty long 7 percent grades to climb like last weekend. Ill try pulling them at 65 in 4th this time and see what happens.