[RJ237]

Welcome to the forum. I used the procedure by Bill T, available in a pdf that you can download from 'maser stuff', link below.
The heater core was also used by Volvo and I bought one on ebay for about $30. If you can't find one I'll search for the paper work.


https://drive.google.com/folderview?id=0B3CWXPqs0MoYdkRQcXAwZ0M3UUU&usp=drive_web

 

[RJ237]

I made an error. It was a Saab 9000 core. If you buy a Maserati core it comes complete with the box and costs over $1000, maybe cheaper on ebay. The Alfa equivalent is just the core, probably $200+ if you can find it.

You should also plan on replacing the foam seals on the various air duct outlets as they have probably disintegrated. I couldn't figure out how to replace the two hoses without removing the inlet manifold, so I left them.

New Heater Core Saab 9000 1992-1998 5046362 | eBay

 

[RJ237]

The one bought on ebay was made in china. I wonder if the saab dealer parts are also.

 

[RJ237]

I would be interested in the details on the brass core also, as I intend to sell my spyder this spring and buy a coupe. Chances are good it will need a replacement if it hasn't been done recently.

 

[RJ237]

You're probably right, but the aftermarket ones for under $30 are from China and I don't trust them. I see there is a URO version also, but even then, who knows?

One thing I have learned from the Jag forums is that even supposed OEM replacements are being sourced from lowest bid suppliers and not equal to the original factory parts.

I looked for all metal heater cores before I replaced mine but could only find custom made at rather exorbitant prices. I will use the Brassworkes unit for my next 4200 if it needs one.

 

[RJ237]

The bypass will not affect engine temp. as air is not passing through the heater core if you do not require heat, and the liquid volume is low.

The AC will not be affected, and it wouldn't hurt to flush the heater with water, but I don't see an advantage either as long as you blow it out with air.