Can the heater core have engine coolant or refrigerant flowing through it?

Can the heater core have engine coolant or refrigerant flowing through it?

Some of that coolant can be diverted through the heater core to give some engine heat to the cabin, or adjust the temperature of the conditioned air. Hot coolant passing through the heater core gives off heat before returning to the engine cooling circuit.

How do you flush heater core?

Now, here’s how to perform a heater core flush:

1. Step 1: Locate the Heater Core. First thing’s first.
2. Step 2: Disconnect the Heater Hoses.
3. Step 3: Apply the Pressure.
4. Step 4: Hit it with the Hose.
5. Step 5: Reconnect the Heater Hoses.
6. Step 5a: Flush your entire cooling system with Thoro-Flush.
7. Step 6: Refill the Coolant.

Why is my hot water heater blowing cold air?

Heater core exterior: The heat-radiating fins on the outside of your heater core could also be clogged with debris that makes its way in from the outside air intake at the base of the windshield. This can affect the heater’s output.

What to do if your Volkswagen Jetta heater is not working?

If the car is getting up to temperature,then there is an issue with the heater core. The easiest way to fix this problem is to replace the thermostat. A new part can be purchased here in the “Cooling System” section for your specific year Jetta.

How to change the blower motor on a VW Jetta?

Once you have the part, you need to remove the old resistor and install the new one. You will need to first remove the glove box to gain access to the blower motor resistor. This thread gives detailed instructions on how to do this.

Where does the coolant go after flushing out the heater core?

The inlet hose may have a heater control valve which regulates the amount of coolant flowing into the heater core. The outlet hose will typically run straight to the radiator or cooling system reservoir to return the coolant after flowing through the heater core.