Engine Cooling problem
1992 Subaru Legacy 4 cyl Two Wheel Drive Automatic 165000 miles
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My engine keeps overheating. I have replaced the timming belt the thermostat the waterpump all the hosses and the radiator recently. It worked fine for about 3 weeks and then the temp began t rise as I drive it . When I am stopped at a light t is in the middle. I also noticced that it makes a gugelling noise when I ress on the gass pedal. I looked last night the transmission fluid was low. I want to know what I should do. My friend says there may be an air bubble in the system causing it to make the guggle. I look forward to your help

bleed the system, you may have an air pocket thats not allowing the coolant to go into the heater core, also check your engine coolant temperature sensor