Why doesn't my heat work after a radiator replacement and flush?
I have a 2000 Dodge Ram 2500. I just took the truck to get the radiator replaced and the system flushed. Now my heater will not heat. What could be wrong? The heater worked very well and the heater core is only 2 years old.
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Answers
You could test for a heater core clog by opening the hood and feeling the input and output hoses to the heater core. If input is hot and output is cold, then you either have a clogged core or a bad heater valve. If neither one is warm, then maybe air blockage or low coolant or sticking thermostat.
you can also search through YouTube and you will often (but not always) find someone doing the exact same task as you need to do.