Cooling Systems Schematic Diagram

[donerehart]

Thanks for all your work with this Wheel!

[vandor]

As I mentioned, it happened shortly after I turned the heater on, so I am kind of suspecting an air bubble as you suggest. Do you think that the coolant may have just been circulating in the heater core loop, bypassing the thermostat?

I think it's more likely that there was air in the heater core, and it created an air bubble in the cooling system when you opened it.
It would flush and refill the system with the heater valve open, and see what happens.

[Wheel]

Diagram for the Carb, Water Choke Version



Diagram for the Carb, Manual Choke or Electric Choke

[Wheel]

I have posted a .pdf version of each diagram on Google Docs for anyone to download. The image is larger and clearer. It should print nicely on 8.5" x 11" paper. Copy the https address into your browser address bar. Download the original.

Cooling System Schematic – FIAT Spider, Fuel Injection
https://docs.google.com/open?id=0B3XBQI ... kwMWY0MDFl

Cooling System Schematic – FIAT Spider, Carburetor with Water Choke
https://docs.google.com/open?id=0B3XBQI ... IxMGU3ODFm

Cooling System Schematic – FIAT Spider, Carbureted with Manual or Electric Choke
https://docs.google.com/open?id=0B3XBQI ... dhNzA4MDkw

Let me know if it works out. This is my first time doing this.

[donerehart]

These are superb! Great work and thanks for sharing!
Don

[blusmith]

Thanks . that will help get my flows correct . Chris

[RRoller123]

Excellent!

[SpecialTool]

I just replaced the heater control valve in my '75 and noticed it was connected to the line from the head (opposite from the diagram), thus blocking hot coolant from entering when closed. Should it be the other way around? The inlet should be the lower of the pipes on the heater core to allow any air to escape into the rest of the system and, hopefully, eventually to the expansion tank via the radiator, right?