I've literally just done this and the main radiator as part of my V70R restoration.
Here are some tips:
- Drain coolant from bottom of radiator
- Pinch two heater hoses at bulkhead using brake pipe clamps
- Remove glovebox and lower panel
- Remove drivers lower panel
- Remove centre console side trims for both sides
- Lift carpets up
- Place thick plastic sheets under matrix on passenger side to catch any spills
- Keep lots of rags/old towels to hand
- Undo the three torq fittings for the white heater box (two midway, one right at the bottom where the two pipes go into the matrix)
- Pull the attachment points and catch what coolant comes out
- Remove the small stick up rubber trim piece to aid access
- Wiggle out the matrix being careful to not damage pipes
- Strip out old matrix and clean housing - you'll have to undo the bolts underneath
- Refit new Mahle Behr matrix and foam sealing strip - note the matrix only goes one way due to the bolt pattern underneath so you can get this wrong
- Fit the two new o-rings to the matrix pipes (use some new coolant to lubricate them and ensure they're on correctly
- Reverse what you did above, making sure the pipes go in clean and the torq screw nips up
- Tighten up both mid-way torq screws
- Refit and fill with coolant/bleed
I reckon it took me 2 hours to do all that and I was taking my time cleaning etc.
The actual refit of my car took ages as the heater matrix had been leaking for years so I had to strip the entire interior, cut out all sound deadening, lay in all new 3 layer automotive stuff, buy all new carpets etc and then take my time building it all up. I did it very thorough, and left the interior floors drying in the intense heat for weeks! Even took the time to place some zinc primer/anti-corrosion waxes over the floors.
Good luck, its really not hard. Just be warned that if it's made a right mess, the coolant will have absolutely saturated the thick foam under the carpet and that will all want coming out....
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