‘98 Riv Climate Control Problems

New member hoping to be saved from the dealer here… The wife’s climate control fan does not operate when the engine is running, but seems to operate normally with the ignition on (and engine off). From reading other posts it seems that displaying codes is not possible with this vehicle, but pls advise if I’m mistaken. Thanx in advance for the help!

Allow me to amend my original post above (after having driven her car for some distance this morning)… In auto or manual fan mode with engine running the blower fan does not run at all or switches rapidly between high and some lower speed, almost seeming to “puff” occasionally for short periods of time. With engine off (ignition on) the fan controls operate normally. Thank you for looking!