Q: what could cause this?

asked by on November 14, 2016

We have replaced the top radiator hose (it blew a hole in it) we replaced the radiator(seam busted after replacing hose). Before this replaced the thermostat and cap. We also replaced heater core and water pump in the last two weeks. The van is not overheating. The heat was not working except when was stopped (not always) after changing all the above the heat is working majority of the time but when I go to stop it cools way down (take off again gets hot again). Also after driving for little park and turn off van hear gurgling and the thermostat does not seem to be opening (this is why we put two new thermostats and gaskets in. Any solutions? A different kind of thermostat? Or another new cap? Help please
My car has an automatic transmission.

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