1970 kick panel knob function - Chevelle Tech
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post #1 of 14 (permalink) Old Dec 10th, 19, 4:42 PM Thread Starter
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1970 kick panel knob function

Hey fellas, just trying to figure out the function of the knobs on the kick panels. My car is an AC car, but with the 2 kick panel knobs. From my research, factory AC cars didn't have these knobs, but I don't think my car was originally AC. I can see the lower vent open and close with the lower knob. It works properly with the push pull function. However, the upper knob...I'm a bit confused. My buddy came over, and pulled on the upper knob, and it came almost all the way out, and no resistance when pushing back in. Where is it supposed to connect to and can I get to it easily? I noticed that after he pulled the upper knob out, and then pushed it back in, warm air started coming from the dash vents, even with the heat/AC off. Is the vent stuck open now?? Where does that vent pull air from? I would assume the cowl?? Would air be coming from all dash vents (both sides and center)?

1970 Chevelle 454, 4 spd Muncie, 12 bolt, 3.31, AC, PS, PB, Ridler 695, Nitto 555
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post #2 of 14 (permalink) Old Dec 10th, 19, 10:22 PM Thread Starter
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Re: 1970 kick panel knob function

more details...

the flapper door in the cowl was not functioning, so I think this may be a coincidence that all this happened. My current situation, hot air from center vents and side vents. It blows regardless of switch position on the control head. Even when I move selector to AC, it still blows hot air. I was messing around with the distributor a few days ago, but I looked just a second ago and everything seems to be in place including the line off the PCV to the heater control. The car didn't start doing this until a few days ago. So, with it blowing hot air all the time, is that a vacuum issue? I have a ON/OFF valve under the hood, and I switched it to off, but still get warm air.

1970 Chevelle 454, 4 spd Muncie, 12 bolt, 3.31, AC, PS, PB, Ridler 695, Nitto 555
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post #3 of 14 (permalink) Old Dec 10th, 19, 11:36 PM
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Re: 1970 kick panel knob function

The heater control needs fill time vacuum, only t off the trans modulator, not the PCV, good luck with your car!!

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post #4 of 14 (permalink) Old Dec 11th, 19, 12:55 AM
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Re: 1970 kick panel knob function

The 70 non a/c cars have a vent in the cowl as seen below. You would have 2 knobs in the kick panel on these non a/c cars. One of the knobs goes to a valve in the cowl vent to stop airflow through the vents. The other knob goes to the footwell vent. A 70 original factory a/c car has no cowl tube as shown in Dean's picture below. A 70 A/C car has no vent controls on the kick panels.


Maybe your heater door is not closing completely or the seals are bad on the door. A quick fix is to install a positive coolant shut off valve into the heater line. If you have the stock shut off valve, it's probably leaking heated coolant through the heater. It's controlled by vacuum, so check to see if you have vacuum at the valve with the heater on/off. I've seen quite a few of these heater shutoff valves that leak heated coolant past the valve even when supplied with a good vacuum.
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post #5 of 14 (permalink) Old Dec 11th, 19, 8:00 AM Thread Starter
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I attempted to look in the passenger side cowl and discovered this. The vacuum line didn’t go anywhere and this flapper door was just lodged in the cowl. I’m assuming this is the vacuum operated flapper door that is mentioned for AC cars?? Maybe it was retrofitted?? But, it doesn’t look like it has been functioning for a long time, so I don’t think it is the cause of the constant warm air.
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1970 Chevelle 454, 4 spd Muncie, 12 bolt, 3.31, AC, PS, PB, Ridler 695, Nitto 555
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post #6 of 14 (permalink) Old Dec 11th, 19, 8:33 AM Thread Starter
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Re: 1970 kick panel knob function

Quote:
Originally Posted by LeoP View Post
The heater control needs fill time vacuum, only t off the trans modulator, not the PCV, good luck with your car!!

where is that located?

1970 Chevelle 454, 4 spd Muncie, 12 bolt, 3.31, AC, PS, PB, Ridler 695, Nitto 555
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post #7 of 14 (permalink) Old Dec 11th, 19, 8:36 AM Thread Starter
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Re: 1970 kick panel knob function

Quote:
Originally Posted by DUTCH MAX HEADWORK View Post
The 70 non a/c cars have a vent in the cowl as seen below. You would have 2 knobs in the kick panel on these non a/c cars. One of the knobs goes to a valve in the cowl vent to stop airflow through the vents. The other knob goes to the footwell vent. A 70 original factory a/c car has no cowl tube as shown in Dean's picture below. A 70 A/C car has no vent controls on the kick panels.


Maybe your heater door is not closing completely or the seals are bad on the door. A quick fix is to install a positive coolant shut off valve into the heater line. If you have the stock shut off valve, it's probably leaking heated coolant through the heater. It's controlled by vacuum, so check to see if you have vacuum at the valve with the heater on/off. I've seen quite a few of these heater shutoff valves that leak heated coolant past the valve even when supplied with a good vacuum.

There is an aftermarket shut off valve installed by the PO. I opened it up when I was flushing the coolant, and shut it back off, so I find it interesting that I'm still getting warm air blowing through the vents.


Speaking of vacuum, my heater vacuum line is split off of the PCV line from the valve cover to manifold. I installed a breather on the opposite valve cover this weekend. Would that cause lose of vacuum? I guess I'm a bit confused... So the heater control needs constant vacuum in order to NOT blow air??

1970 Chevelle 454, 4 spd Muncie, 12 bolt, 3.31, AC, PS, PB, Ridler 695, Nitto 555
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post #8 of 14 (permalink) Old Dec 11th, 19, 8:37 AM Thread Starter
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Re: 1970 kick panel knob function

Quote:
Originally Posted by DUTCH MAX HEADWORK View Post
The 70 non a/c cars have a vent in the cowl as seen below.

Is that vent on both sides? The passenger side doesn't have that round vent. It has that not functioning vacuum controlled flapper. Picture in previous post.

1970 Chevelle 454, 4 spd Muncie, 12 bolt, 3.31, AC, PS, PB, Ridler 695, Nitto 555
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post #9 of 14 (permalink) Old Dec 11th, 19, 11:59 PM
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Re: 1970 kick panel knob function

Quote:
Originally Posted by vtchopperdude View Post
where is that located?

If you have an automatic trans, the vacuum modulator has a line that goes from the modulator to the rear of the intake with a fitting that has two possible vacuum tee's, one could be for the brake booster(the larger one) and one small one for the vacuum line that goes to the modulator, with a short rubber vacuum hose at each end, take a look to see if you have that fitting in the manifold behind the carb!!

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post #10 of 14 (permalink) Old Dec 13th, 19, 1:57 PM Thread Starter
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Re: 1970 kick panel knob function

Quote:
Originally Posted by LeoP View Post
If you have an automatic trans

I have a 4 spd Munice
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post #11 of 14 (permalink) Old Dec 13th, 19, 3:17 PM
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Re: 1970 kick panel knob function

Quote:
Originally Posted by vtchopperdude View Post
Is that vent on both sides? The passenger side doesn't have that round vent. It has that not functioning vacuum controlled flapper. Picture in previous post.
Yes, the vent shown is on both sides on non A/C 70 cars.

At the time I took that picture I had a non A/C 70 in one bay and an A/C 70 in one of the other bays to compare
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post #12 of 14 (permalink) Old Dec 13th, 19, 4:56 PM
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Re: 1970 kick panel knob function

This might help :

https://www.chevelles.com/forums/32-...72-malibu.html

As much that I remember the vacuum hose should go to the heat A/C control panel and from there are a bunch of silicon type hoses that branch out.

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post #13 of 14 (permalink) Old Dec 13th, 19, 11:35 PM
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Re: 1970 kick panel knob function

Since you don't have A/C, there shouldn't be a coolant control valve in the heater hose,it only actually shuts off the coolant during the MAX position. good luck with your car!!

Leo Paugh
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post #14 of 14 (permalink) Old Dec 14th, 19, 8:32 PM Thread Starter
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Re: 1970 kick panel knob function

I do have AC, but I don't think it originally had AC

1970 Chevelle 454, 4 spd Muncie, 12 bolt, 3.31, AC, PS, PB, Ridler 695, Nitto 555
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