My Radiator is Average Heating Up?

1991 TOYOTA COROLLA
111,001 MILES
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MICHAELLSJ
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I Have to Put Coolant @ 1st?, then after a Long Simple Drive About 3-5 Miles distance driving it on a 35 MPH Zone. I had to refill water in the reservoir container. It's like where did I put the coolant & it's Gone.? I hear a gurgling from the upper hose like its having a hard time drinking the water? Where & How may solve this problem with your assistance? Thank you awaiting for your reply/response.

P.S.
I Already change the water pump & thermostat components.
Jul 20, 2013 at 5:45 AM
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HMAC300
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have apro pressure check your coolant system for leaks it may be ahead gasket
Jul 20, 2013 at 5:49 AM
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MICHAELLSJ
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The headgasket have already been change before I bought the car.
& on a Toyota corolla dx 16 valve efi automatic (4 cylinder) 1991, is there a block drain plug? The only plug I know is on the radiator that is mounted in/on the bottom tank?
Jul 20, 2013 at 6:15 AM
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HMAC300
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check radiator for cold spots or loose corroded fins if there are the rad needs replacing. also do what I've suggested I first reply.
Jul 20, 2013 at 7:33 AM