Clattery when cold
Join Date: Feb 2012
Location: United Kingdom
County: Greater London
Uh, OK. I've never come across a thermostat failure that didn't cause overheating, and if my wife's driving, a cylinder head gasket failure (2x car, 1x motorcycle to date).
When these AR thermostats fail they seem to allow coolant to circulate the entire system and run under temperature, rather than the more conventional outcome where the cooling system is isolated by closure of the top hose by a shut thermostat, and overheating is the outcome of the coolant circuit being restricted to the bypass. I thought that must be ingenious design rather than AR thermostats just breaking in a different way to the majority.