Hi I have a 95 1L metro, I've been reading the posts and trying to troubleshoot this coolant- heat issue I've been having,... basically, sometimes my cabin heat works and temperature gauge work and sometimes they don't, even when I know the engine is hot, the guage will drop right off down to the very bottom like the car is turned off, when this happens, I find that the heat dosent work and the top radiator hose and the hoses going to the cabin heat exchanger are cold. This is not a minor flucuation of engine temperature due to the fan turning on and off. (I just checked the thermostat in water on the stove and its good, and I just put a radiator in and a new water pump and there is no coolant leaking out anywhere..... so I think that this tells me that sometimes the coolant is circulating and sometimes not, and this dictates when my cabin heat works or not... this sounds like I have a blockage somewhere maybee? I checked for blockages in the rad, thermostat, cabin heat exchanger, all rubber hoses,.... is it possible to have a blockage in the engine block somewhere?? any sugestions as to why the hot coolant in the engine isn't circulating???? will a bad head gasket reduce the coolant pressure enough to stop it from circulating???- thanks Robby