I did this job today and here are a few things I noticed that will make it a bit easier.
(Although It still took me more than 3hrs)
1. Remove the bracket holding the hard cooolant lines to the chassis, this will give you a little bit
of extra slack pulling the hoses through the firewall.
2. The breather hose (top one on the manifold) is connected to a quick release in the engine compartment. Disconnect there and connect to the manifold first.
3. Disconnect the oil filler tube in the engine bay, this gives more room, too.
4. Cut the gasket at the hole for the main coolant line. Connect this line first without the manfiold in place. Make sure the clamp is facing upwards and not outwards, otherwise it won't fit through the cutout later.
5. Connect the middle hose to the manifold.
6. Connect the oil hose to the manifold.
7. Move the gasket around the main line.
8. Push the overflow hose onto the manifold (no clamp required)
9. Connect the oil filler tube to the reservoir.
This method requires access only from the trunk and the top of the engine.
I used long reach 45degree pliers and a pair of flexible hose clamp pliers.
Also, I had help from a friend.
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