Re: Heater core gurgling?? Help
When I put in a new thermostat and radiator in a recently purchased 2.3 Ranger cuz the system was so neglected and crudded up from the previous owner, I tried to flush the heater core without removing it by holding one hose up high and pouring hot water into it and running the other hose down into a bucket. LOTS of crud!
Anyway, recently installed a numbered temp gauge with the sender in the heater hose coming out of the T-stat housing, right next to it. So drained the system of course. Now not getting as much heat out of the core, have realized I need to again take one of the hoses loose and hold it up high and pour water into it to purge the air out of the top of the heater core. The inlet and outlet on the core are both at the top, so can imagine it could get air locked pretty easily esp since the top of the core sits higher than the ends of both heater hoses where they hook to the engine.
After you do that, hold your thumb over the hose and hook it up quickly to avoid getting much air into the line when water runs out.
I'd think that purging the air like that might help your gurgling.