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Check valve that lets hot water in to heater core also heater core is in box under dash that has door that opens or closes to block off or let heat in to passenger compartment
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maybe the tap for allowing the water into the heater rad is not opening or the heater rad is blocked check the two hoses coming from the heater rad and see if they both feel the same heat when the engine is hot
Have you replaced the rad cap or the thermos stat? If so you may have an air lock within the system which would require you to run the car for 10 to 15 mins with out the rad cap on this should remove the air lock..
obviously the water pump was never fixed properly if it is still leaking, take it back to were you had it repaired and have them repair it properly. A number of problems could cause your vehicle to over heat. -water pump not working properly. -low antifreeze. -air lock. - rad cap not working properly. -thermos stat not working properly.
the only thing I can recommend is to put in a flush tee not the hose going to the water pump but the one going to the engine open up the radiator and drain that first then fill with water get some radiator flush and run the car about ten minutes drain that out using the flush tee and a garden hose and run till it is clear with the engine running after clear close drain plug on radiator and fill with antifreeze and make sure to get all air bubbles out and you should start getting some heat and if you don't after doing all this replace the heater core but check the hoses coming from the heater core to make sure one of them is not plugged
turn your heater on to max heat and high fan. then see if you can feel the hoses on the firewall for heat they should be hot. make sure that the fan unit on the radiatoris working if the upper radiator hose is hot the fans should be running if they are not that means that either the relay is bad the thermo sensor is bad or the fan unit is shot... please rate the solution..........thanks
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