There are two connections but only one is attached to the intake and it looks like a aftermarket hose! No hose can be found the other.
This is a fairly well maintained NA 2002 V70 wagon but does have 2 codes that relate to lean fuel mixture, po 504 and po2177. Weather permitting a smoke test is planned!

Lost me at "AF."

Translate the acronym for us?

I think he means "air Filter". Isn't there a valve that draws warm air from exhaust during cold start/warm up and then closes as temp rises?

You are correct about the air filter, thanks!
Today I braved the cold and found the missing hose and reattached it. It was under the AF housing.

2000 P1 V70. Bad starting. After wrestling with the air intake nozzle the goes from the front slam panel to the air filter, I didn't realise it was in 2 pieces, I inadvertently dislodged the vac house underneath. I also had a split elbow that mates the thin vac hose to the back of the filter box. Fixed that one but was still unaware the the other one had come off. Both hoses are adjacent to each other on the inlet manifold. It gave me a lot of grief when starting and would hunt up and down at tick over. Would still drive just about. scanned it with Vida which told me it was running lean but the computer would repeatedly correct for that hence the hunting. Eventually found the the bigger pipe was off under the intake nozzle. Popped it back on and all was again right with the running and starting. It's often just the little things that are sent to try us. I do need to replace the the larger hose, 6mm I think, as it has started to vacuum itself flat!

Thanks for the translation. Once the pre-heat flex hose is re-installed to the air filter, car starts and runs better?

Vacuum passes through the device so definitely a leak! plugged it and idle dropped down to about 850.
Assume it must control warm or cold air to AF?

Vacuum passes through the device so definitely a leak! plugged it and idle dropped down to about 850.
Assume it must control warm or cold air to AF?