I've got a fairly crazy heater in my 1987 300D (it's a US one, so US push button climate control system)
For years it has always squeaked. It makes a high pitched chirping noise a lot. But lately it's gotten worse. Now it turns into an occasionally gridining noise, it sounds like something it hitting and getting stuck and fighting to get free in the dashboard.
Also my center dashboard vents only work part of the time. And I see only to have the noises when the center vent isn't working. My two window vents work fine, as does the one along the windshield I think.
Next problem: My off switch doens't work. The heat or AC is constantly on. If I have it set to off with the fan on the low speed setting air still comes out. If I push the auto or full speed setting the fan just blows higher, the same as if I have it on any other setting.
Then there's the defroster: It works fine, especially when I set it to high. It's after I'm done using it that I have a problem. If I switch the system to off or all vents the fan will cut out and then every few seconds it will turn onto full blast on the defroster for a few seconds and then cut out again.
We've had this thing looked at and worked on many times over the years and nothing has helped. Does anyone know what could be causing any of this?
For years it has always squeaked. It makes a high pitched chirping noise a lot. But lately it's gotten worse. Now it turns into an occasionally gridining noise, it sounds like something it hitting and getting stuck and fighting to get free in the dashboard.
Also my center dashboard vents only work part of the time. And I see only to have the noises when the center vent isn't working. My two window vents work fine, as does the one along the windshield I think.
Next problem: My off switch doens't work. The heat or AC is constantly on. If I have it set to off with the fan on the low speed setting air still comes out. If I push the auto or full speed setting the fan just blows higher, the same as if I have it on any other setting.
Then there's the defroster: It works fine, especially when I set it to high. It's after I'm done using it that I have a problem. If I switch the system to off or all vents the fan will cut out and then every few seconds it will turn onto full blast on the defroster for a few seconds and then cut out again.
We've had this thing looked at and worked on many times over the years and nothing has helped. Does anyone know what could be causing any of this?