70 blower function, AM radio volume

[Pat M.]

Hi all. The 68-72 PV manual says my heater fan blower should not "operate" with the left hand thumbwheel in the off position. It also says when this thumbwheel control is in the off position, the system is "totally inoperative."

Yet even when the thumbwheel is in the off position on my non-AC SB my fan "operates", in that it turns, but it can't blow because the vacuum switches have closed off all the air doors.

Is my system working correctly, or should the fan not even turn when the thumbwheel is in the off position? If the latter, what might be the problem?

Also, the volume on my AM radio is pretty low. I had it totally serviced by D & M Restorations a couple years ago, and the FM is clear and loud. But the AM volume is so low it's hard to hear over engine idle at max volume, even though I can catch several stations. Is this normal, or, if not, what could the problem be?

Thanks, Patrick Moresi #45581

[Pat M.]

BTW, radio and speakers are factory *NM*

[Dick W.]

Re: 70 blower function, AM radio volume

Have you trimed your antenna per the owners manual??

[Pat M.]

Re: 70 blower function, AM radio volume

Dick - no I haven't yet, but it's the first thing I'm gonna try. I just now read about this feature. Thanks

[Dick W.]

Re: 70 blower function, AM radio volume

Usually that will help the problem you are having

[Pat M.]

Further blower info ...

When the left thumbwheel is in the off position, AND the fan speed switch is in the off position, the blower gets no power. But, if I move the fan speed switch to the low, med, or high position, the blower gets power even though the left thumbwheel is still in the off position. Normal?

[Jack H.]

I think you're mis-reading the PV manual...

The commentary on heater fan speeds starts by summing up the function of non-AC equipped cars (just the first sentence) and then SWITCHES to describing the funtion of the heater fan for AC equipped cars. Methinks you're trying to 'force' the AC specific description onto non-AC equipped cars...

If you look at the wiring diagram + the AIM for your 1970, you'll find the following. First, in the AIM the ONLY electrical connections at the climate control panel in the center console are: (1) cig lighter, (2) control panel illumination lamp, and (3) heater blower switch.

Flip to the equivalent drawing under the C60 (AC) option and you'll find that version of the climate control panel ADDS a set of electrical switches to the outboard LH side of the control panel to effect the fan over-ride functions specific to AC equipped cars.

Then, go to the wiring diagram and you'll find the non-AC equipped cars simply bus fused power to the heater blower switch that runs out to the heater fan via a selected leg of the resistive divider network (no power, low power, medium power or high power). The C60 wiring diagram is quite different.

It sounds to me like your car's heater fan is operating EXACTLY as it was designed to and how a competent PV judge would expect it to work...

[Pat M.]

Re: I think you're mis-reading the PV manual...

Thanks Jack, great explanation as usual.

However, methinks the PV manual is a tad confusing. First, under the heater fan section you mention dealing with both AC and non-AC cars, it wouldn't hurt to clarify which commentary deals with which cars.

Secondly, below that, under the section "Air/De-ice Thumb Wheel Control (non-AC)", it states "When [the left] control is in the OFF position, the system is totally inoperative". This could be read to confirm that the fan should not work when the SYSTEM is TOTALLY inoperative, but apparently this paragraph is referring to the AIR DOOR system, and does not include the fan.

Anyway, I really appreciate your response.

[Harmon C.]

Re: I think you're mis-reading the PV manual...

Patrick

You should have a good chance to pass your PV because you are checking things out and knowing how things should work. Run through the PV at home a few times with no problems and you should do OK.

Good Luck
Lyle

[Pat M.]

Re: I think you're mis-reading the PV manual...

Thanks a lot Lyle, I sure hope you're right! I'm trying my best to not fail because of lack of preparation or effort. We'll soon see if it was good enough! Regards, Patrick