Project XJ

[Ryan T]

Well the Jeep was having a heating problem...in that their was no heat. It would change from defroster, to blowing at your feet and everything just fine it would just never get hot. So I rooted around on some forums and decided to blow the heater core out and then clean it out with some CLR.

First step was to get the ole air compressor and blow gun out.



Took off the two heater hoses up by the thermostat. Put the inlet hose into a milk jug and stuck the air gun into the outlet. That was it would blow it out in reverse of the normal flow. Had to wrap some electrical tape around the nozzle on the blow gun to make it fit snugly.



I made the initial mistake of giving it too much air without holding the hose firmly in the milk jug and ended up with a facefull of coolant and the towel on the other side of the driveway. Let the air go slow and then onto full blast to clean it out. Here's what came out of the heater core with one blast of air.



Next I ran half a bottle (that's all it would hold) of CLR into the heater core and left it alone for about half an hour. I took advantage of that downtime to put new quick couplers on the air compressor along with new teflon tape as the old ones were leaking a little air.

Blew the CLR into the jug, filled the core with water and blew the water out. Repeated this rinsing process about 9 times with about a gallon of water. Put the hoses back on, topped off the coolant and now I've got Hot Hot Heat.