I was wondering if anyone could explain how the idle is affected when the air conditioner is turned on. The only wires in my engine harness seems to go to the ported vacuum switch and the heater harness which goes to the blower motor, resistor, compressor clutch and relay. Should the idle go up to compensate the a/c clutch kicking in. The other question is my assemble manual (section12 page 170) shows my wire from the heater harness going directly to the blower motor, yet on another page (section12 page 164) it has a capacitor that attaches to the blower motor for noise suppression. When I disassembled the car, I did not have one of these capacitors attached to the blower motor, only under the dash next to the steering column.

Dave

 

On mine with a 2 barrel there is nothing to compensate for idle drop. I haven't got the A/C working yet but it will be and I was wondering about that too.
Nothing on the carb but the anti-stall dashpot that doesn't hook to anything.
Mine does have a slight charge and will go on but it drops the idle way down. I was thinking of retrofitting an idle compensation solenoid if I do have problems but I hate doing stuff like that, it worked when they built it and should work now. I've seen some earlier and later models with them so the brackets and solenoids are around.

I looked at that page with the blower and it says with 35U68 or 35U63 cars get the resistor which are codes for radios. It's just a short lead that extends and plugs into the connector on the blower feed wire, somebody here should have one if you post in parts wanted.
Oldsmobile had a special thing about radio noise suppression I was told by an old time Olds mechanic. On mine there is a resistor that goes between the terminals on the vacuum switch and I was going to take it off but he said it was factory.
Mine makes no noise with the am-fm radio or 8 track on, I'll have to go look and see if I have that deal.

 

I pulled a 72 apart that had 350 w/AC and there was a factory jumper harness that went from the ported vacuum switch to a carb mounted solenoid for idle speed. I will try to post some pics tonight if I get the chance. This was from a 2bbl. motor so the bracket will be different than a 4bbl.

I'll see if I can find any pics from manuals I have also.

 

My 72's fits Bluevista's descriptions also. My 350 has a 4bbl. No idle control for anything, just the anti-stall dashpot.

My A/C worked when i first got the car and idle drop was minimal with the compressor running. These old V8 engines had plenty of torque to deal with even the A6 compressor.

I think even the horn relay had a radio suppression cap on it (the one under the column?) Now think - who would even think to try to listen for radio noise when you had to blow the horn?? Would one even hear it over the horn noise? Hmmm...

 

Thanks for the help guys. When I disassembled my car, I know it didn't have this capacitor on the wire harness. I was wondering after looking at the manual if the capacitor was for non ac cars only. I am at the point where I'm testing the electrical harness but not quite ready to start the engine for the first time yet so i don't know abut any noise that could possibly be coming from the blower motor. I know it's a P.I.A to reach the blower plug, so the capacitor should really be fun installing if I need to. As far as the throttle soleniod, I haven't seen any info in the 71 service or assembly manual regarding this.

David

 

I think the throttle solenoids were installed starting in '72, you might consider setting your initial timing to around 18*, which helps some, and running a higher idle speed in the summer. BTW, the '71 carbs don't have a provision for a throttle solenoid.

 

Here's what I pulled from a 72 350 2bbl. w/AC. Don't know if this will help anybody?

 

Those are some nice pics.

I think that's an anti-dieseling solenoid and jumper harness?
It will hold the idle up but only to one speed then retract when you shut it off to prevent dieseling.
May be able to be used with some engineering.
I think Rob is right and the engine should be able to compensate for the A/C like his, I'll find out soon enough anyway.


Does a horn make a sound if it blows in the woods??
I bet the bear knows.

Hey Rob! You're back!

The place hasn't been the same without you.

A few of us at the most were worried about where you were but Cutlassgal Sandy kept your itinerary that some of us ignorantly missed on hand and let us all know what happened like the good mom she is.

I hope you had a great vacation.
Some of us had to make the sacrifice to stay behind and hold the fort.

You left a real ticking time-bomb with your motorized chair thread, don't look, it's not pretty.

 

[quote=Bluevista;124117

I think that's an anti-dieseling solenoid and jumper harness?
It will hold the idle up but only to one speed then retract when you shut it off to prevent dieseling.[/quote]

Should've looked it up first