93 Merc Marquis Heater Problems

[93MercMarquis]

Yes the Mercury has been very good to me has 100,000 miles on it runs like a champ but now when I turn on the heater it makes a loud low pitched noise maybe it's the heater motor or the fan or the motor and fan has to be replaced???

[vtwindave]

turn on a/c & see if noise is still the same, try fan on low,med & hi. does the noise change? if you get same noise on heat & a/c
, it sounds like the fan is causing the noise.

[93MercMarquis]

I'll Try the AC Tomorrow. See if it Makes any Noise Anyways I turn the Heater on and The Higher I set the Heater the Louder the Sound Gets so as of now I just Ride around with the Heat on low Because it isn't as noisey