Engine Fan Staying On...
Discussion in 'Trucks [ Eighteen Wheelers ]' started by tkilby, Jun 23, 2010.
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Amber75707 Thanks this.
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if your fan sensor system is operating properly, you are just wasting fuel by running the fan more than the system really needs.
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and 200 degrees is nothing nowadayz !!!!!!!
But honestly, lots of us turn it on manually, no biggie !!!! -
I know its a waist of fuel to keep it on much. During the 90 deg. plus days here I keep it on in traffic to keep the air moving under the hood. I would think it would help the alternator, sensors, and a/c parts keep cool. Before it put a switch on I would go through two gallons of oil in 15k miles now I'm down to one. When the fan is on I don't get above 1400-1500 rpm's. It also keeps the fan off when traffic clears, it will stay on for miles of the ecm cycles it on.
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Found the problem with the fan, with engine running there was voltage to air-control solenoid it was replaced and the fan is now cycling.
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congrats tkilby. sounds like your shop knows what they are doin.
greenmile_08 Thanks this. -
I have a 97 Pete with a cat and all of a sudden the engine fan started to stay on! I have changed the air switch on the fire wall and have noticed that it has constant power? The switch is suppose to be normally closed according to Peterbilt? I have talked to Peterbilt and they told me to change the way it was plumbed to normally open still not working? I have jumped the high pressure and let it run for 45 min and still runs, could this just be the manual switch in the dash? i am going to change the relays and try to figure out why it has power all the time?
Thanks DanLast edited: Apr 2, 2016
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Which switch is the high pressure switch I have 2 on the ac one is blue and one is red I take it the red is high pressure .
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