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So just recently and of course when the temperature outside drops it decided to stop blowing hot air into the cab... the air is still blowing and the switch from cold to hot air still operates just fine. Water level is good and no engine over heating issues... so I'm not sure if it would be the water pump thermostat or heat core.... so curious to see what you guys might think it is...


   
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you should check the hoses going to the heater core. When the engine is up to normal operating temp. check the two hoses going to the heater core. You will be checking the temp of the hoses. Normally, they would both have hot engine coolant going through them.

if equipped, check the operation of the heater control valve.


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