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How much energy would the Saab radiator have been expected to convert originally? Is it possibly a bit too small to cope with the larger Rover engine? Just a thought, but maybe a larger rad, or a second one mounted in the boot with its own, electric fan would help?
Pondered this, myself.
I reckon the Saab radiator will be more than adequate, given the power the Saab turbo models generate.
Instead I would be looking at bleeding the cooling system efficiently as well as doing an engine compression test.
From the photograph of the engine installation I se you are using a Volvo (?) expansion tank.
These have a 16 or 19mm outlet at the bottom to be plumbed into the bottom radiator hose.
Is yours connected up this way?
It should be!
For filling the coolant it is important to have the expansion tank as high as possible. To this end I would use
long hoses to allow the ET to be temporarily lifted from its mounting.
SET HEATER TO HOT (VERY IMPORTANT).
Fill coolant, (DON'T fit ET cap), run engine for 3 minutes at 1500 rpm.
Top up as necessary (shouldn't need much), then fit cap.
Refit expansion tank to mounting bracket.
(For any subsequent topping up it is necessary to lift the ET from its mounting).
Hope this is useful,