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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / July 2006starter and air conditioner
My boss told me to turn off the A/C when I park the truck 'cause it puts unneeded stress on the starter. I told him that didn't sound right, and I was fairly certain axillary functions were shut off when a car started. He assured me that they did not. After googling the subject, all I could find was a thread in this group from last year: "The compressor clutch, evaporator and condenser fans aren't energized (on any car's I know of) while the key is in the 'Start' position anyway. They're powered through the 'accessory' side of the switch, and aren't activated until the key is released to 'run' position. Some even have computer controlled 'delay' features. In reality, it doesn't make a whole lot of difference if you leave the A/C on or not when you shut down/start up... " Before I go back and argue me case, can this be confirmed by anyone? Also, he only drives cars from the 70's. Was this a problem with cars from that time period and prior? All that being said, they are his trucks, so if he wants me to put a banana on the motor after 6pm to improve the truck's karma... Thanks, Troy The start position on any automotive electrics I have worked on is it's own unique circuit. It even has a bypass to energize just the coil and ignition circuits. I know for sure on Jeep CJ's (the old ones), Wranglers and Cherokees that no accessories are energized when the starter is running because I have the wiring diagrams that clearly show where the power goes from the 'start' pin in the keyswitch. The starter wants 'all' the power. Now if he wants low load on the engine when it is first at idle, shutting off the AC would make a little sense... maybe. The only way you can for sure argue the point would be to get the keyswitch pinout and wiring in print. The Public Library has most auto manuals, or it used to anyway, so you could photo copy the pages. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > My boss told me to turn off the A/C when I park the truck 'cause it > puts unneeded stress on the starter. I told him that didn't sound [quoted text clipped - 26 lines] > > Troy As you said, he is the boss and makes no difference what you think. Good luck in your new job. > My boss told me to turn off the A/C when I park the truck 'cause it > puts unneeded stress on the starter. I told him that didn't sound [quoted text clipped - 26 lines] > > Troy >My boss told me to turn off the A/C when I park the truck 'cause it >puts unneeded stress on the starter. Nonsense. > I told him that didn't sound >right, and I was fairly certain axillary functions were shut off when a >car started. If you would like to verify this watch the comprssor clutch while someone else cranks the truck. >He assured me that they did not. > [quoted text clipped - 9 lines] >whole lot of difference if you leave the A/C on or not when you shut >down/start up... " Even if the clutch were to be energized the drag is insignificant. You could easily turn the compressor faster by hand than what it turns at cranking speed. >Before I go back and argue me case, can this be confirmed by anyone? > >Also, he only drives cars from the 70's. Was this a problem with cars >from that time period and prior? Possibly some old vehicles engage the compressor while cranking but even then its not a problem. Don www.donsautomotive.com >All that being said, they are his trucks, so if he wants me to put a >banana on the motor after 6pm to improve the truck's karma... > >Thanks, > >Troy > My boss told me to turn off the A/C when I park the truck 'cause it > puts unneeded stress on the starter. I told him that didn't sound [quoted text clipped - 22 lines] > All that being said, they are his trucks, so if he wants me to put a > banana on the motor after 6pm to improve the truck's karma... Err.... the banana goes in the tail pipe for best effect. Good for at least 2/4 MPG. ;) Bob > Thanks, > > Troy > My boss told me to turn off the A/C when I park the truck 'cause it > puts unneeded stress on the starter. I told him that didn't sound > right, and I was fairly certain axillary functions were shut off when a > car started. > > He assured me that they did not. Yeah, he is the boss, but not right on this. I used to have a girlfriend who was also anal about many things automotive. I was willing to comply because of the things she brought to the party. > > My boss told me to turn off the A/C when I park the truck 'cause it > > puts unneeded stress on the starter. I told him that didn't sound [quoted text clipped - 10 lines] > I was willing to comply because of the things she > brought to the party. Thanks for the responses guys. Of course, some of your replies remind me of something I tell my daughters, "Sometimes it's better to be kind than to be correct". However, in this case, it would be, "Sometimes it's better to be employed than to be correct" :) does the ac evaporator fan shut of when the key is engaged, if so, the rest of the system does too. >mho >v fe >no free rides, just deferred payments.... > does the ac evaporator fan shut of when the key is engaged, if so, the > rest of the system does too. Yeah, that's where it gets kinda' sad. I said "Didn't you notice how the radio, lights, and A/C fan kick off when you are starting the vehicle?" His response was that, they are not being shut off, but rather the battery is being drained so much by the starter, that they couldn't operate. > > does the ac evaporator fan shut of when the key is engaged, if so, the > > rest of the system does too. [quoted text clipped - 7 lines] > battery is being drained so much by the starter, that they couldn't > operate. Hi, to me this is a clear case of "are you SURE you want to prove the boss wrong" or are you just wanting to be clear in your own mind. Do as he asks , at least until your employment is secure and you know him better. >>does the ac evaporator fan shut of when the key is engaged, if so, the >>rest of the system does too. [quoted text clipped - 7 lines] > battery is being drained so much by the starter, that they couldn't > operate. That's easy to disprove too. Put the car in gear (engine off) and then turn the ignition to "run"- all the accessories will run. Then turn the key to "start". The neutral-safety switch will prevent the starter from actually operating or "draining the battery" at all, but all the accessories will STILL shut off because the ignition switch disables them before it enables the starter. :-) > My boss told me to turn off the A/C when I park the truck 'cause it > puts unneeded stress on the starter. I told him that didn't sound > right, and I was fairly certain axillary functions were shut off when a > car started. > > He assured me that they did not. Have him watch the center section of the compressor pulley (not the outer ring, but the part that only spins while the compressor is running). He'll change his tune. > Before I go back and argue me case, can this be confirmed by anyone? Its true on EVERY car I've ever owned, from the late 50s through 2000's. > Also, he only drives cars from the 70's. Was this a problem with cars > from that time period and prior? No. > All that being said, they are his trucks, so if he wants me to put a > banana on the motor after 6pm to improve the truck's karma... Well, yeah- do you really want to prove you're right and embarrass the boss? And the AC DOES kick back on as soon as you release the key after starting, so it does load the engine immediately after it fires- so its marginally easier on the engine to start it with the air off. |
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