Hello. I have a 1999 Jeep Grand Cherokee Larado and Im having issues with it. It kept over heating so I replaced the fan, replaced the coolant and thermostat and it still over heats. The fan kicks on but when I turn the heat on nothing happens. Any suggestions as to what might be wrong?

 

are you getting any flow from your water pump? WHen the engine is hot, when the temp gauge starts moving, touch the two hoses going to heater core. They should be hot. IF not then there is a problem.