How can I tell if my coolant return heater is too hot?
How can I tell if my coolant return heater is too hot? Using a test thermometer, check the temperature of the air being discharged at the HVAC housing floor outlets. If the floor outlet air temperature is too low, Both of the heater hoses should be hot to the touch. The coolant return heater hose should be slightly cooler than the coolant supply heater hose. What happens when your Jeep Grand Cherokee heater stops working? At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the...