521 heater knob

[dbuzz77]

can someone tell me how the knob on the heater box is supposed to operate? it says heat or off. does it spin or pull out? thanks

[DanielC]

It should turn about a 1/4 turn. On a 40 year old truck, there is a good chance it is stuck.

[Hyphy]

if it is stuck, dont try to force it with the knob. They can be difficult to come by and using vise grips is much easier. Example: i have 3 cores.... ONE knob

[dat521gatherer]

yeah they all get stuck if not moved often enough. take the screw out and the knob off they use some vise grips and slowly move the valve stem clockwise/counter clockwise. if this doesn't work the only way to get it to move and work properly is to take the heater core out and put a wooden dowel through the pipe and hammer it till it comes out. them clean it and reinstall.

 

careful not to twist that white knob off. they go for $20-30 when they come up on ebay once or twice a year. considered a rare 521 part these days.

[mklotz70]

there's a small retaining screw holding the valve in. If you take that out first, you can turn it more than a 1/4 turn to work it out. You'll want it out of the rig unless you like the smell of antifreeze on your carpet :) Somewhere in my Mend project thread, there's some decent pics of taking the valve out.

[patd]

yeah they all get stuck if not moved often enough. take the screw out and the knob off they use some vise grips and slowly move the valve stem clockwise/counter clockwise. if this doesn't work the only way to get it to move and work properly is to take the heater core out and put a wooden dowel through the pipe and hammer it till it comes out. them clean it and reinstall.

 

careful not to twist that white knob off. they go for $20-30 when they come up on ebay once or twice a year. considered a rare 521 part these days.

 

This was in the glove compartment when I bought my truck, I am still looking for one. :blink:

 

[pl521sss]

This was in the glove compartment when I bought my truck, I am still looking for one. :blink:

 

 

 

 

I have 3 of those knobs

Might sell one or 2

[patd]

I have 3 of those knobs

Might sell one or 2

If you decide to sell one let me know how much you want and if you have a paypal acct. I will send you the payment plus mailing and will add some for the paypal fees.

 

:) :) :) :)

[dbuzz77]

thanks , guys. my knob is almost round, there is no lever on it. i'll try loosening it with spray first.

[zed1]

Has anyone reproduced the decal for the heater control?

http://www.flickr.com/photos/53116286@N07/8981078234/in/set-72157625809569365

Keith