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 …

Are you sure it’s a clogged heater core? You’ve eliminated all other possibilities and have verified that the flow through the core is low? Some of the easier problems would be; coolant is not getting hot enough, blend door is not moving all the way over to the hot position, diverter (if equipped) i…

have you checked the actual temperature of the coolant when the engine has been run? if the air is coming out of the vents too cool, and the radiator is HOT then there is a core problem, but… if the radiator is cool as well, then the thermostat may be broken. the diverter valve mentioned by TT i…

1994 Dakota and the flushing was done in April of last year. It seemed much warmer after the flushing, but now that the weather is in the 20s it surely is more noticable. I’ve never cut a core apart but I presume the fluid is flowing into the top of the core’s tank and right back out the outlet tub…

I did first use a radiator flush product, but it didn’t help increase the temp at the heater. Thats why I used the CLR. When I was finished, I filled the core with Baking soda and water solution to neutralize any caustic chemicals. Then, because the hoses were off it was easier to just hook the gar…

Are you sure you got all the chemical flush and baking soda out of the whole system? I have seen problems like this persist because someone didn’t adequately rinse the system out. I would add the flush and fill kit to be sure the whole system gets both flushed and rinsed. This way you don’t need …

I’ve never cut a core apart but I presume the fluid is flowing into the top of the core’s tank and right back out the outlet tube instead of flowing through the core tubes or only flowing through very few of the tubes… Is that possible??? Not on any of the heater cores I have seen. The only way t…

That was my purpose in hooking up the garden hose to the system. The core, with the chemicals was never hooked to the whole cooling system until after a good flush. I even reversed the hose so I’d backflush anything out, before reconnecting the core to the system. I wouldn’t want to use a “flush ki…

My point was that there could be blockage in another part of the cooling system other than the heater core that is causing your problem. Besides, if you follow the directions, the chemical flush should be safe for the whole cooling system. Unless you are 100% sure the blockage is in the heater cor…

Well, I knew that I was taking a chance. The heater core could be worn enough, that the chemicals would cause a leak and I’d have to replace it antway. Two days ago I flushed it with the pump on a drill. I used 1 pint of lime away mixed with 5 pints of water to dilute the solution a bit. One hose t…

Clogged Heater core

Maintenance/Repairs

Whitey December 8, 2008, 3:42pm 4

You should use a chemical flush that is made for automotive use and follow the directions carefully. You can find them at an auto parts store. I don’t recommend using products that are not made specifically for that purpose. I also recommend buying and installing a flush and fill kit to make sure you get all the chemicals out after they have done their job.

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Clogged Heater core

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