Searched, little heat

[Suparslinc]

I can hear the flaps close/open so I know that is working. I've had this problem off and on for the last year or two, but this winter I really notice it. I did a search and it seems like the first thing I should do is flush the coolant system; I can manage that but I need to know the procedure. The other possibility is the heater core is clogged; I do confess I've used the radiator stop leak in the past for a cracked radiator I never got around to replacing.

Another thing I would like to try is to burp it; whats the best way to do that? My temp gauge has been steady. I don't think it's the thermostat.

[Gibbs]

check the flow/return for the heater matrix, if there both warm then the matrix is fine but i would say thats your issue if the flaps are working mine however are not :(

[Suparslinc]

well i found the hoses, they both seem pretty warm but one is definately hotter than the other. I'm going to go ahead and get a gallon of coolant then report back here after I flush the core.