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 heater has stopped working in your Grand Cherokee, this process has failed in one way or another.

What does it mean when your car heater is not working?

There are two hoses coming to and from the heater core. They both should feel warm or hot to the touch with the engine on. If one of the hoses is hot, and the other one is cold, that is a pretty good indication that the heater core is clogged. If the neither hose has any heat, you may have air in the cooling system, low fluid, or low pressure.

What to do if your heater is too hot?

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. If the return hose is much cooler than the supply hose, locate and repair the engine coolant flow obstruction in the cooling system.

Why is my Chevy Silverado heater not working?

by Alibaster Smith. The heater in your Chevy Silverado supplies the heat to the cabin. There could be several reasons why it’s not working properly. The heat in the Silverado is supplied by the hot engine coolant running through the engine cooling channels. Some of this coolant is diverted from the cooling system into a heater core.

What to do if your car heater is not working?

Solution: Set the heater to its maximum setting, remove the coolant tank cap and fill it to the proper level. Start the engine with cap still open and let the engine idle for a few minutes. If the coolant level should drop as the thermostat opens, top it up as necessary.

Why does my a / C heater blow out cold air?

If the heater outlet air temperature cannot be adjusted with the temperature control knob on the A/C Heater control panel, the following could require service: The A/C Heater control. The blend door actuator. The blend door. Improper engine coolant temperature. I have the same issue as mcebbie. This also applies to the AC in the summer.