What else can you check on a 1998 Jeep Cherokee overheating It only overheats after idling and cools down when Im driving I replaced the radiator thermostat water pump all hoses belts thermo sensor?

Answer 1

not an expert but try seeing if your radiator fan is cycling on. if not check fan relay. check fan itself by hooking diectly to battery to see if its good Bad radiator cap, blockage, new stat is bad, bad coolant temp sensor, air pocket in system, worn blades on waterpump, inadequete mixture of coolant and water. Below is someone else's post-not mine- that I thought was worth reading: check the radiator itself. Corrosion will build up on the aluminum vents inside, and prevent flow of coolant, and even though your water pump is pumping, the flow is restricted (depending on the antifreeze mix you use), and the solution to that is to have it flushed out. They sell bottles of stuff that you add to your radiator to clean it, or you have it professionally done. To have your radiator flushed insures it is clean, and insures you have the PROPER mix of antifreeze. Too often, shops use the 50/50 mix of antifreeze, and common knowledge dictates that bigger 8 cylinder engines need a richer mixture, like 70/30, especially during the summer. Hot water has way much more pressure than hot antifreeze, and the friction of the mostly water mix could be relative to the "running hot" condition. so, 1st.....Run a richer mix of antifreeze, drive it and see the temperature change. 2nd.....Flush and clean the radiator. Betcha nothing your mixture of antifreeze is too thin to handle this hot weather. Hope it helps. Peace. It only overheats with the air conditioner on and IDLING after normal driving and reaching operating temperature. It cools to normal temperature after resuming driving speed. Last year I replaced the water pump, new radiator, water sensor, radiator cap, fan clutch, flushed the engine, replaced all hoses and belts, cleaned the air conditioner coil, antifreeze, I just don't know what else it can be?