the noise of my van is going up and down on 2004 Chrysler Town & Country

it vibrate so bad most especially when i put on the cold air or heat

Asked by for the 2004 Chrysler Town & Country
2 answers
Blower fan wheel out of balance. Remove unit and clean out blower. Usually a mouse nest in blower wheel.
Or bearing worn out.
agree with wetry or poss a/c compressor or related pulleys on eng