Probably a clogged heater core. Orange coolant clots after a while. Should be replaced more often than recommended. If you have intermittent heat you might get lucky with a coolant system flush, otherwise you'll probably have to replace the heater core.
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Sounds like you had a sticking thermostat when you replaced the waterpump causing an air pocket. Replace the thermostat, and jack the front of the car so that the radiator cap is highest part of the cooling system. Then run the car and burp the air out of the coolant system.
also check to see if tube that runs your climate door is not pinched or broken. the vaccum tube that runs the climate door is behind and under the battery. i had same problem a year ago and the tube was partially cut. i fixed it by cuttinga piece of aquarium tubing and spliced it back together. one other thing.....check to see if your radiator over flow cap is tight. your cap maybe bad and or cracked this would also cause the problem.
PAST BY THE LOCAL AUTO PART STORE AND GET NEW COOLANT RESERVIOR CAB MAKE SURE CLOSE NICE EVEN AND DONT FORGET THE CHECK COOLANT LEVEL. RUN THE CAR AND WAIT TILL REACH THE NORMAL OPERATION TEMP. TURN THE HEAT ON HIGHEST LEVEL GO TO ENGINE DEPARTMENT ON PASSENGER SIDE NEXT TO WATER PUMP TOP OF THE COOLANT BY PASS METAL PIPE HAS BLEED VALVE USE NUMBER 8 WRENCH MAKE IT LOSE LITTLE BE BECARE FULL WILL BE HOT. WAIT TILL COOLANT START COME OUT WITH OUT AIR MAKE THIS STEP 3-4 TIME CHECK EYE ON TEMP. GAUGE AND HEATER TEMP. USE ONLY DEXCOOL.
White smoke is a sign of burining antifreeze. When heater is not blowing warm air, that is a sign of faulty heater core. No power, coolant loss, overheating, is sign of headgasket leak. Double check your thermostat as well.
It is probably the problem. To make shure that need to change the gaskets, one of the symptoms use to be thet the temp rises when you are running at speed 50+ average, where is supposed that the car gets a lot of air due by the speed and nobody thinks that will be overheated.
there is a valve on the water pump and one on the thermostat housing open those up one at a time until you get a little bit of antifreeze come out then tighten them back up. All you will be doing is bleeding the air out of the cooling system. my car was doing the same thing after I changed my thermostat.
If you get cold air when the heater is on, you have lost quite a bit of coolant. Now the question is what caused you to lose your coolant.
As long as you didn't drive around with your engine overheating, your engine should be fine. I think you would know if you had damaged your engine.
When the engine cools, fill your cooling system, start it up and check for leaks or overflow. If the only water your see is from the overflow when the engine starts to overheat, then it very well could be the water pump or thermostat. Chances are the thermostat will need to be replaced anyway.