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Ask sprinkles08 Your Own Question
sprinkles08, ASE Certified Technician
Category: UK Car
Satisfied Customers: 23109
Experience:  ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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2004 W220, 320 CDI; Heating inside don't work, blows cold,

Customer Question

2004 W220, 320 CDI; Heating inside don't work, blows cold, sometimes a little heat. Heater in bak, very very warm and feels normal.
JA: Have you checked the coolant level? Has there been any leaking from the hoses?
Customer: No . . . . no leaks, level good . . blows real hot in the back?
JA: What is the make/model of your car?
Customer: 2004: W220, S320 CDI
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: So far just been browsing possible causes. But I am confused since it blows warm in the back
JA: Anything else you want the mechanic to know before I connect you?
Customer: . . . . no, cant think of any . . .
Submitted: 10 months ago.
Category: UK Car
Expert:  sprinkles08 replied 10 months ago.

Hello and welcome to JustAnswer!

If you have normal heat in the rear but not in the front then there is either a blockage in the heater core or you have a blend door issue. The blend door is the door in the heater box that controls temperature.

Was the loss of heat progressive or sudden?
Are the heater hoses too hot to comfortably hold at the firewall with the engine at operating temperature?

Customer: replied 10 months ago.
Not sudden, but on longer drives, I get some heat (not much). Something "blocking"? Does not help me much.
Expert:  sprinkles08 replied 10 months ago.
If the problem happened gradually that points to a heater core. You can try having it flushed but replacement is usually the ultimate repair.