MVS Forums member and new-to-Volvo SUNRG shows us how to modify the 240’s air box to make it reliably pull in fresh air. Instead of a “factory” fix that would fail in a similar way down the road, he chose to engineer his way around this. Good work!
I’ve been into european cars my whole life, but I only relatively recently became a 240 owner … and I’m in love. What a fantastic car!
So I recently changed the air filter on this new-to-me car and of course found that the airbox thermostat was non-functional, and the engine has only been drawing air off of the exhaust manifold for who knows how long … the bottom of the old air filter looked like toast.
IMHO the thermostat is an unnecessary weak link, if (when) it fails it’s horrible for the car in many ways … so I:
- deleted the whole valve
- cleanly blocked off the warm/hot air intake port
- removed the snorkel to guarantee loads of free-flowing cool air
- added a coarse screen, to prevent anything sizeable from entering the airbox, thereby enabling the air filter to do what it does best … remove tiny contaminants from the air to promote long healthy MAF and engine life