If you love it, lube it. Unless mechanical failure, like a failed rivet or fatigued spring in the assembly.

If you have a silicon spray in an aerosol can with a straw, you can try to lube the little spring latch, behind each button, assembly by lightly spraying into the spaces between the buttons. Then work the buttons. Action should feel smoother without a button getting stuck.

Else, after two decades of button action, there may be mechanical damage of some sort.

Behind the three HVAC flap control buttons is an assembly, made of (usually) white ABS plastic, that is, at essence, the vacuum manifold to control the three sets of HVAC vacuum actuated flaps.

The buttons are mechanically secured to the manifold. Sometimes, if these buttons are pressed too hard, or something heavy, presses on the center console, to dislodge this assembly. Two barbed fittings, either side of the plastic manifold assembly, secure this assembly with the buttons poking out straight. If the manifold is mis aligned, the button can contract the center console cowl or facade (or hhhwhut should I call it?) If the buttons are all in the out position, and you the buttons not straights, crooked to one side, you have to crack open the center console. Your Bentley big blue Volvo Service guide bible, or the Volvo OEM Green manuals (find them online in PDF, yet these are written towards trained and practiced mechanics).

Spray as little as possible each time between and around the top edge of the three buttons, and work them. A light touch on the silicon spray nozzle helps.

Do not use a WD-40 or the like. Even the solvents and carriers in a relatively benign silicon spray may stain or harm some materials like the ABS plastic the Volvo 240 center cowl and such works are. So, use a gentle touch with your finger at the silicon spray nozzle.

As for the brickboard search, well, use a web search like teh Google and teh Bing or teh DuckDuckGo or ... . (LOL Cats say 'teh' and not 'the'.)

So, I'll tell yeh hhhhhhwhut .....

In the search string field, where you enter your search query, to target brickboard, use:

site:brickboard.com

site:www.brickboard.com

Teh 'www' forces the network protocol type. Use teh domain or add the 'www' as you like.

Example:
Volvo 240 Heater Defroster Recirculate Buttons site:www.brickboard.com

Using teh web site you like. The search vernacular for search control should be the same across all web search sites. I may very likely be wrong. Teh Google and the far less useful bing, save for the bing image search, of LOL Cats, will work with that.

Ultra Large Veggie Pizza with Extra Cheese and Triplicate Anchovy!

Hope that helps.

Go Seahawks!
--
MacDuffy's Tavern: We got no tee-vee for sports. Just an owld five-tube super heterodyne AM radio next to the velvet Elvis. Or is it a velvet Clovis? Clovis Presley: Elvis' long-lost brother.

"Aw Ma! The Seahawks just gotta win the Supperbowl! They just gotta! They're the good guys!"