94xjeep
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Last of the XJ's are 14 years old now and one that worked for me was removing the water pump, thermostat housing, and all the steel welsh plugs off the side of the engine block under the exhaust manifold. manifold off to do this job. pressure wash out all the rust, scale and muddy crude from around the lower area of the engine block. Run the genuine thermostat, gen water pump gen 16 psi cap. These are partial pressure caps, you tube will explain it to you. Chrysler has used this system for 50 years now. CPC and tridon caps are crap the valve at the bottom of the radiator is spring loaded, it's not meant to be on jeep. Replaced all coolant hoses and I haven't looked back. take your time to clean out the block use wire to dig around for any lose material. due to the low flow of coolant around the cylinders this stuff builds up and up taking away the cooling systems coolant capacity. If you boil, this stuff comes lose and turns up in your radiator tanks and jeep being cross flow type radiator this is not good at all as gravity works against you with cross flow radiators. When engine is off the whole lower tubes get this mud that sits in the tank(hot side) down the bottom. It runs into the tubes but due to the length of the tubes gravity makes it settle and form layers of mud rust ect. Now the lower part of the radiator is now slowly blocking off. Keep the reverse flushing up to date every 12 to 18 months and the radiator should keep going longer. Tip the radiator upside down and make a 90 degree nozzle that can spray high pressure water into the tank (hot side or inlet) through the radiator hose opening and watch the rubbish come out |
excellent info mate! it's an extreme measure but this underscores the serious need to flush the system regularly!!! its one of the most neglected maintenance procedures for the XJ but #1 on the list of failures.