You're in luck. I just discovered something that will cause that. Read the last section of my ACT repair on my 76. You can test your little valve by just pulling up on it to see if that makes a difference. http://roadhoggtech.dns2go.com/nybml/membercars/bradhogg/76NYB/atc.htm ----- Original Message ----- From: "Roger Cooper" <RCOOPER9@xxxxxxxxxxxxxxx> To: <mailing-list@xxxxxxxxxxxxxxxx> Sent: Monday, June 23, 2003 10:37 AM Subject: IML: 74 IMP blower Just checking to see if any of you guys have had this problem blower motor will only run in defrost mode,, any ideas?? Roger Cooper