On the cabin filters, my understanding is that it's an either/or regarding whether you go with thicker active carbon or thinner regular. I think I came across a post which said if you put BOTH in at the same time, the interior blower motor has to work extra hard to draw air and you run the risk of burning it up. I don't remember what brand I used when I replaced my filter but I think I went with the cheaper option.
Not sure if it's related, but my '02 had the AUTO option on the CCM button for air re-circulation and it had the thicker filter. My '07 only has the manual ON/OFF button for air re-circulation and it came with a thin filter.
My '02 had a slight leak from one of the O-ring seals and I could see the coolant was wet around the aluminum tube union with the heater core. It only leaked slightly in the winter with the heat going. Replacing the seals is difficult. Apparently, you have to line things up just right and/or use significant force to get the tubes to seat in the heater core with the new seals. All this while you're lying on the carpet in the foot well with your back twisted up. I played with it a while and gave up, afraid I was going to break something with the force I was applying. There are threads on the subject of people who have successfully replaced the heater core and seals.
Good luck!
2007 XC70, 206,000 miles
2002 V70XC, 130,000 miles, parts car
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