wassup guys, need a lil help here on determinng the diameter of the coolant hose that connects the turbo coolant passage to the lower part of the water pump. It looks like 8mm but not sure. Also where can I find this coolant hose? AA only has those thick fuel lines...

I started the car today for the first time in a month after some repairs and it idled rock solid at 750!!! before it would bounce from 1000-1500, and I had pretty bad vacuum leak because the lower intake gasket was blown. So I just need to replace that coolant hose because it is torn
Anyways I think I need a new alternator because the interior and dash lights dim when I do anything...

 

I bought that hose from Mazdatrix, it's the OEM peice and it fits perfectly. I had fuel line like you're talking about on there first, but it would just get kinked and no coolant would flow though.

 

3/8" fits those fitting in a pinch. But like impulse says go ahead and spring for the correct part. A standard piece of fuel hose will kink.