<What is the function of the gray valve at the top of the rear heater core? Is this an emergency shut off? Or some kind of temperature adjustment?> That valve at the top of the rear heater core is a bleeder valve. I guess so you don't have to bleed the main coolant system. Useful if you have to replace your core like I had to about 6 months ago. It's actually quite easy. Just clamp the inlet and outlet hoses and insert the new heater core. Then I unclamped the lower hose, switched the lever to turn on the heater core and started the engine. Air came out, then coolant and bubbles and then just coolant. I then just closed off the valve. Someone suggested driving up and down a bunch of steep hills to let the self-bleeding system work (wherever that hides out!) and it all seemed to go OK. Anyway it worked for me. Good luck Rich 90 Westy |
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