Seems like you are losing pressure in the system as the coolant gets hotter it builds up pressure if you have a small leak when it gets to a certain pressure it will blow out and you lose pressure and the heater will blow cold, run the motor till it gets hot and look for coolant or steam coming out, check the coolant cap while your at it
Thank you,
My wife says she sees steam coming out, I hope it's not a water pump,but she said it looks like that after she parks. I tasted the fluid, it had a very small take of coolant but not very sweet as it would normally would but was more clear. It looks like it is coming around the windshield wiper reservoir
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