I popped the hood today to check on coolant levels and I noticed one of the hoses leading to the heater core has a crack in the outer rubber. Its not weeping or leaking yet so I've got another one on order. I was concerned though that the hose looked half collapsed. When I squeezed it to try and pop it back into shape it was still flexible and I heard the thermostat clicking. Should that hose be somewhat collapsed like that? I opened the overflow tank cap and some air escaped and the hose regained some of its original shape.

 

just a sign of a failed hose

 

FYI if one hose is bad others will be CLOSE behind. You can buy an (ALL THE DARN HOSES) kit and just change them out. Cheaper than a tow and maybe a motor.