hissing and groaning with heat on
Thread Starter
Senior Member
Joined: Dec 2006
Posts: 299
Likes: 15
From: Boston, MA
2002 E320 4matic 92K (bought 12/20/06). 2000 E430 4matic (RIP 12/9/06) :(
hissing and groaning with heat on
I noticed that when the heat is on, it makes a hissing sound. more annoying, when i accelerate from low speeds, it actually groans as if it's in unison with the transmission - more groaning with more throttle, until i get to a certain speed, like on the highway. then i still get hissing. this isn't A/C; this is heat, though the auto button is what i press to turn the heat on in the winter. i turn the heat off under these conditions, and the noises stop and the car sounds normal. has anyone had this issue? is this a regulator issue, something easy to fix myself?
Thread Starter
Senior Member
Joined: Dec 2006
Posts: 299
Likes: 15
From: Boston, MA
2002 E320 4matic 92K (bought 12/20/06). 2000 E430 4matic (RIP 12/9/06) :(
hey rd - do you also hear the groaning i'm hearing when accelerating at low speeds...? it's definitely not happening when the fan is turned off, which seems strange...
Thread Starter
Senior Member
Joined: Dec 2006
Posts: 299
Likes: 15
From: Boston, MA
2002 E320 4matic 92K (bought 12/20/06). 2000 E430 4matic (RIP 12/9/06) :(
i'm not sure of anything; asking what it could be? it's too cold lately to run the AC. i'll try it later but it's happening with "Auto" on as well as the directional mode which doesn't automatically shut off. if it's the blower motor what am i looking at in terms of a DIY fix or parts to buy?
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Thread Starter
Senior Member
Joined: Dec 2006
Posts: 299
Likes: 15
From: Boston, MA
2002 E320 4matic 92K (bought 12/20/06). 2000 E430 4matic (RIP 12/9/06) :(
update, noticed today it happens with the regular vent/heat on, but it goes away when i turn on recirculate air. ???
zx11, if it is the blower motor, what can be done?
zx11, if it is the blower motor, what can be done?
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Thread Starter
Senior Member
Joined: Dec 2006
Posts: 299
Likes: 15
From: Boston, MA
2002 E320 4matic 92K (bought 12/20/06). 2000 E430 4matic (RIP 12/9/06) :(
nope, it's the other way around for me.
with recirculate air, the sound goes away. with regular heat coming into the cabin via the outside through the cabin filter, the noise persists.
with recirculate air, the sound goes away. with regular heat coming into the cabin via the outside through the cabin filter, the noise persists.
