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1972BlueC20 · 06-05-2014, 09:05 PM

I have a 72 C20 with aftermarket A/C, it was added a long time ago. Ive noticed that when I run the AC it drastically changes the exhaust note. It gives it a major drone. Is this normal?

If so, why? Is it just because the extra strain its putting on the engine?

06-05-2014, 09:05 PM	#1
1972BlueC20 Registered User Join Date: Jun 2014 Location: Houston, Texas Posts: 722	A/C causing exhaust sound change / drone I have a 72 C20 with aftermarket A/C, it was added a long time ago. Ive noticed that when I run the AC it drastically changes the exhaust note. It gives it a major drone. Is this normal? If so, why? Is it just because the extra strain its putting on the engine?