Hi and thanks for using 2CarPros.
First, do the following:
Check for proper engine coolant level.
2. Check engine for proper operating temperature (approximately 91Â C (195Â F)). If engine does not reach 91Â C (195Â F), replace thermostat assembly
3. With engine at normal operating temperature, check heater inlet and outlet hose temperature
Heater inlet hose temperature should be at or near engine operating temperature.
Heater outlet hose temperature should be slightly cooler than the heater inlet hose.
If heater hose temperatures are incorrect, replace heater core.
Let me know if this helps. Also, the added drain on the alternator from the blower motor may be the cause of the noise. Make sure the belt is tight and in good condition.
If you have a scanner, I have attached the diagnostic directions for the problem. They are somewhat involved. I had to cut each section in half so you can read them. I thought I would add them just in case you have the tools needed.
Make sure fuse 20 is good in the in car fuse box under the dash.
Let me know what you find.
Images (Click to enlarge)
Thursday, November 22nd, 2018 AT 8:31 PM