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Members,

After changing the diff. and transmission fluids and replacing the fuel filter yesterday in my '91 Spider, my next task is to drain and flush the coolant system and replace with distilled water/coolant/water wetter.

My question is this:

What is the best/preferred method for draining the coolant, flushing the system, and replacing the fluids. In cars I've owned in the past, the radiator would have a drain plug, and a fill cap on the radiator, not so on the Alfa.

Any and all help, as always, is much appreicated.

Thanks in advance,

Aaron
 

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Aaron,

You need to drain the block as well.
The block plug is located on the rear side of the
engine under the exhaust header. I think its a
22mm bolt.

Unbolt this, and let the cooland drain, also
drain the radiator thru its plug.

After installing both plugs, fill the radiator,
and bleed the air out of the system by loosening
the little bolt on the top of the water plug, until coolant drools out. Tighten this bolt, then
loosen the bolt close to the thermostat and add
coolant until it drools out also. Tighten the bolt,
your done.

If you are going to all this trouble, you might
consider removing the radiator and having it rodded.
It is after all a 12 year old car, and Alfa's really
dont tolorate overheats very well. Its cheap insurance.

I have been using Red Line water wetter with really
great results.
 

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"After installing both plugs, fill the radiator,
and bleed the air out of the system by loosening
the little bolt on the top of the water plug"

sorry, meant to type water PUMP.:D
 

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...except there is no radiator drain plug on the S4 cars...and if there truly is, you can't reach it due to the metal fins just below the radiator. Best thing you can do it pop off the lower hose.

Depending on the size of your arm and how convenient your hose clamps are, its a pain. I'd recommend getting the top hose out of the way and removing the top bolts on the cooling fans...you can pivot them out of your way for another 1/2" of room to work. (Don't forget to reattach your coolant temp sensor wires back to the radiator later!)

Have fun!
 
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