Put your heater temperature control in the max position on(this opens the valve for coolant flow through the heater core). Top off the radiator and the coolant resevoir. Make sure the cap is on tight and bring the engine up to operating temperature. Shut off engine, allow to cool, and top off the radiator again. Repeat these steps until you are sure it will not take anymore coolant. Drive the car at speed for 5 or 10 miles and recheck again when cool. It takes awhile to work air out of the system with multiple openings of the thermostat.
A plugged or partially plugged radiator would mimic what you are experiencing. It also sounds like a thermostat isn't closing and regulating as it should, although it shouldn't pump coolant out of the overflow if it is stuck open. I have come across thermostats that were inadvertantly installed upside down. Typically the short side of the t-stat goes toward the engine. A good radiator flush may be beneficial, but if it is plugged very much you may want to recore the radiator. The folks at the radiator shop would have the best judgement on that.
I didn't mention the heater core as I figured you had enough to deal with right now, and replacing a heater core can be a long laborious job! If you look at the thermostat there will be a "hat" the assembly sets in. The short side of the assembly should point toward the engine(some even have "eng" stamped in them, or "rad" for the side that points in the direction of the radiator. If you didn't have this problem before you replaced the gaskets, then there is a good chance the t-stat is turned around.
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Tried your solution a couple of times, I still have antifreeze coming out of the overflow hose of the coolant resevoir. I brought my car to a auto repair shop and got a coolant flush,hoping to push the air pocket out,didn't work. They arent 100% sure nut they think the radiator is clogged, they did check the water pump and its good. When it idles, we get cold air, we hold the engine at 2800 rpm's for a couple of minutes and get the temp up to 215-220*, we get real good heat, slow it back down to an idle and we get luke warm. Is it possible to heater core is clogged?
I see you didn't even mention the heater core, so the next step is to repair the Radiator ? But first I'm going to turn the t-stat around for the hell of it, I wasn't having this problem before I put the gaskets in and a new thermostat. Would a backwards t-stat cause a slow opening and lack of coolant to reach the heater core ? Thus causing major bubbling (hearing) in the hose going to the t-stat housing ?
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