Fan surges when fan clutch is engaged?
#1
#2
I haven't seen a truck do it but the fan on my dad's central a/c condenser at his house would surge at a frequency of about once a second or two. We would take the hose and wash the fins from the inside out and it was good for another month. If the fins on your radiator, intercooler and a/c condenser are partially clogged, it could cause the same backup of airflow surging. Just a possibility.
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