s65e90

I run CSF rads, water wetter and new coolant/water pump/t-stat and sit right in the middle or just to the right on the gauge. Normal in 100 degree temps.

"02996ttx50

ok, so updated.

with AC ON this time..and after a spirited 1/4 tank run thru canyons & freeway w/ outside temps btw 85/95 degrees.. the coolant temp dash gauge while up steep grades and occasionally idling, never went above 185 and even then, only for short periods. immediately resting at a comfortable 180 back at sea level.

so, while i can hear/feel the DRIVERS side fan blowing profusely from the front at idle? the passenger side is far less noticeable, so i am still wondering if something is amiss. that said, given the consensus is this is all within "normal" range, i'll go find something else to obsess about unless this gets "worse" or the t-stat completely goes south. again, thanks for everyone's input.

Carlo_Carrera

Both fans should blow the same amount. Your passenger side fan may be on the way out.

Kevinmacd

"02996ttx50

thanks carlo..both dont seem to be operating optimally. sometimes the pass side is blowing full bore.. but now its was only the drivers side blowing at full speed ( seemingly )
kevinmacd. thanks.. whats the best way to isolate if it is in fact a resistor possibly.., and not a failing fan on passenger side? is this a test with a durametric?

"02996ttx50

yes, thanks.. I can obviously FEEL and HEAR when they are operating at FULL speed. but after this recent hard run, its was only the drivers side blowing on FULL> is everyone in agreement that BOTH should be blowing at FULL speed, and if the pass side is intermittent? that could be a resistor?

garrett376

They should both be blowing full speed. The resistor is only used when slower speeds are present. A PIWIS (and probably durametric) can run the fans to check them, but you can also hook up 12V to the fan and it should blow fast: pull out the fender liner, unplug the harness, and put 12v+ to the yellow/black wire, and put 12V- to the brown wire. If it doesn't blow full speed with 12V directly, it's the fan motor that's bad.

As these cars age, the brushes in the motors seem to get pulverized. My passenger side is awaiting its replacement to show up in the mail as I type... Too bad Pelican doesn't ship as fast as it used to in the past or I'd be assembling it back up today.

"02996ttx50

ha.. ill be testing all this about 20 miles from pelican! thanks again.. it should easy to test as you indicated. THEN order what i need.
thanks garret

s65e90

When the relay(s) under the dash fail the fan will run full speed all the time, weird. I found that both will NOT operate at the exact same time/speed. This was detailed somewhere I read a while back. Could I be mistaken, sure, but I'm very certain it went over the entire operation of the cooling fan systems/resistors and motors. But if the car isn't broke, and temps look fine, why are you looking for problems?

"02996ttx50

that mirrors my experience also. they don't seem to be working at the same time and speed. again, just the other day the passenger side worked at FULL and this i knew from standing next to the residual air blowing while i was fueling the car.

but NOW.. the only one that seems to blow at FULL SPEED is the drivers side. so..i am NOT "looking" for problems(?) per se. yet, this for me is *anomalous* behavior ( based upon my having owned two different 996 turbos over ten years ) in terms of the fluctuations and seeming increase in gauge temps when idling. i have NEVER once, in either car, seen the coolant temp gauge deviate btw 180 ( normal ) and 185 and even up to approx 190 in stop/go traffic or while idling HOT. perhaps you understand my concern? perhaps not. it's that i sense that a component of the coolant system is failing lol. i'm merely trying to isolate which if any. is all.