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W126 Expansion Valve Noise
This is on the 87 300SDL, was converted to R134a by the Prev owner at the MB Dealership.
Anyone experienced this? This happens at idle/low speed stop and go traffic, the expansion valve makes a whining noise, similar to a dog whining, the noise immediately goes away when I raise engine idle speed or turn the AC off or to EC. Not sure if this is a sign that I'm running low on refrigerant or oil in the system etc. AC still works well, cools fine otherwise. TIA
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91 350SD 14 F150 Eco 19 Fusion Hybrid 11 GT500 |
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Do you know if the exp valve was changed also? An expansion valve can go out, and can makes noises.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
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