I have a Dodge Dakota, that the heater core is clogged. I would replace it, but on this vehicle, you need to have the Air conditioning evacuated to remove the cooling core first. Poor design in my mind.
The cost of purging the system and then refilling it with refrigerant and testing it will add far too much to the repair costs, for this to be practicle.
Last fall I bought a small Drill driven pump and some extra hose. I flushed the core with CLR to remove any rust and corosion. Then reversed the direction of the pump. 20 minutes in each direction. The flushing seemed to help, but now that the cold weather has come, the heater air is still not warm enough.
I did test the CLR, on some Aluminum foil in a dish first, and it didn't harm the foil, being soaked for 2 hours.
I would like to try this flushing again. Do any of you have any recomendations for chemicals that may clear the clog.
I'm thinking about trying some LimeAWay next. I tested that in a dish with aluminum foil and it didn't harn it over a hour soak.
FYI; I also flushed it with Radiator flush then finished off with a Baking soda and water flush to neutralize any acid from the CLR.