1992 Ford Explorer Other - Engine


Question: Recently I had a head gasket blow. After the vehicle was fixed and three thermostats later I still have a problem. 1) The heater does not seem to blow as hot anymore. 2) When driving or sitting still the temperature changes from the "O" in NORM to the "A" then goes to completely cold. 3) Whenever number 2 above happens the air blowing from the heater even turns cold. This continually happens. I returned to the mechanic and he said he could not find any problems. I installed a new radiator prior to the head gasket blowing and have changed the thermostat several times since. He said that I have a good flow and that the engine is at normal operating temperature. If this can be explained I would be greatly appreciative. Thanks

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Technican: hello I read you statement did you try an engine flush? to clean out the engine since blowing the headf gasket?
Owner: I apologize for my ignorance but do you mean the coolant, fuel system, or oil. Brian
Technican: I mean the coolant, because it is most likely that the ports in the engine are clogging causing your thermostat to open prematurely causing over cooling and also restricted flow to the heater core. are you using antifreeze? when you changed those therms were they diffrent temperatures?
Owner: I used the thermostat that the local parts store said would fit and do have the proper level of antifreeze. Also when I took it back to the mechanic they supposedly changed the thermostat again. I personally did not flush when changing the thermostat. Before the head gasket blew I installed the new radiator and of course did it then. I assume they had to flush when doing the head gaskets and probably not when they did the thermostat.
Technican: ok chances are the previous flush would still stand the thermostat is probly opening too soon so you may need to find out what heat range is being used and install one of a higher heat range it is important to find out what was in the car before if possible was it original? would I be correct in stating that it was working correctly previous to the head gasket blowing a gasket?
Owner: Yes it was working properly. The original thermostat was not replaced when the head gasket was done to my knowledge and here is why. After receiving the vehicle back I noticed the erratic behavior of the thermostat and decided to replace it myself. When removing it the rubber seal seemed like it was worn and replacement was not listed on the invoice.
Technican: this is a cool burning engine and I believe if you put in a new thermostat that opens at a higher heat range you will be fine

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