My transport is overheating, how do i fix ?

1998 PONTIAC TRANSPORT
102,000 MILES
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TOBARQ1
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I have already replaced the thermostat and the radiator cap. The water pump is circulating water but it is still red lining. I hear a hissing coming from the side of the motor that the thermostat is on, but it sounds like it is further in , closer to the firewall. I don't see any steam and I don't see any water dripping from underneath. What could it be ???
Jun 16, 2012 at 4:12 AM
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RASMATAZ
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You sure the thermostat is installed correctly-if so bleed the cooling system if it continues block and pressure test the system
Jun 16, 2012 at 9:44 AM
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TOBARQ1
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Thanks for your reply.And yes the thermostat is installed correctly. I have bled the cooling system. however I have not pressure tested it. I don't have a way to do that. The hissing sound is coming from the backside of the motor and it looked like the shift linkage on the tranny was wet. I could not see well enough to pinpoint the location. Is there a pressure release in the block in that location??? Or might it be the rear head gasket ???
Jun 18, 2012 at 10:05 PM
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RASMATAZ
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You can rent a cooling system pressure tester. could be from a leaky intake manifold,cylinder head or a feeze plug
Jun 20, 2012 at 6:56 AM
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TOBARQ1
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How would I , other than a pressure test, pinpoint which of the 3 it is ?
Jun 20, 2012 at 7:23 PM
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RASMATAZ
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Get a block chek-a chemical tester that changes color if there's a combustion leak into the cooling system-check at autozone
Jun 20, 2012 at 11:09 PM