| [GMCnet] Re: Dash Blower inop [message #368522 is a reply to message #368520] |
Fri, 21 January 2022 08:10   |
Dave Stragand
Messages: 307
Registered: October 2017
Karma:
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Senior Member |
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Tom,
I found John Watkins' presentation on HVAC troubleshooting to be a great resource. Here's the link:
https://www.gmcmi.com/wp-content/uploads/2018/04/GMCMH-AC-Control.pdf
The Road Knows…….. Heat/AC Dash Control and Vacuum Controls
The objective of this session is to…provide a through understanding of the dash Heat/ AC controls and how that knowledge can be used to help in troubleshooting. •To familiarize you with how the factory intended the Heat/AC control systems were
www.gmcmi.com
-Dave
1978 Transmode near Pittsburgh
________________________________
From: tomkatz3@comcast.net
Sent: Thursday, January 20, 2022 7:47 PM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Re: Dash Blower inop
Gentelmen,
I have power at the fuse panel and both sides of the heater fuse. I switched blower relays with a known operating blower relay. I by-passed the delay
relay. I have no power at the fan speed selector or the newly switched out relay.
The fan does blow on low when the yellow wire is re-connected on the driver side low speed plug. I disabled the yellow wire in order to have the fan
shut off when the selector is in the off position.
I guess I now know the blower is operating and grounded. I believe the relay is good.
Any additional thoughts and/or ideas are welcome?
I look forward to any suggestions.
Take care,
Tom K.
--
Tom & Oki Katzenberger,
Kingsville, Maryland,
1977 23' Birchaven, 455 C.I.D., Micro Level, Howell EBL-EFI Spark Control, Macerator, York Air Compressor, 6 Wheel Disc, Quadra Bag, Onan W/Bovee
Ignition
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1978 Transmode (403)
Pittsburgh, PA
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