Ford Thunderbird Starting in the 1950s, this was a classic American sports cars, from the compact original of the 1950s, to the muscular hard top coupes of the 1980s and 1990s to the retro look of the 2003 model year, this car is, and always will be, an American classic.

1989 blower speed problem

Old 03-16-2017, 04:48 PM
Junior Member
Thread Starter
Join Date: Mar 2017
Posts: 12
Default 1989 blower speed problem

Hi everyone,

I have an '89. The heater/ac blower only works in the high speed setting. I would like to know if anyone can help me find the faulty part. I believe the fan switch itself is working correctly. I tested it and the contacts seem to be working. I haven't found the blower, but it looks like it is under the glove box area. The blower is working anyway. I haven't found an pics of what I am looking for. Can anyone help ?



Last edited by gironha; 03-16-2017 at 04:52 PM. Reason: More info
Old 03-16-2017, 04:52 PM
Junior Member
Thread Starter
Join Date: Mar 2017
Posts: 12

Ok, I see now after posting that it appears to be the blower resister. Is it located behind the glove box?
Old 03-16-2017, 09:09 PM
Hayapower's Avatar
Super Moderator
Join Date: Jul 2006
Posts: 6,310
Thumbs up

Welcome to the site...

Yes,, in the blower case. The default is high fan speed. When the lower speeds are selected/commanded with the fan switch, the voltage remains the same, grounding resistance changes within the resistors coils selected by the fan switch. When you pull it out, most often the thermal protection ( looks like a bullet shaped diode stretched between the coils) has an open. If you take a test lead and bridge the thermal unit where it connects to the resister unit,, all fan speeds should then work. Thermal protection is needed, so if it's open, a simple replacement resistor is the fix...
Old 03-16-2017, 10:19 PM
Junior Member
Thread Starter
Join Date: Mar 2017
Posts: 12

Thanks for replying. Do you know if the resistor coil piece behind the glove box? I don't want to take that apart if it is not there. I have manuals for all my cars except that one.
Old 03-21-2017, 08:28 PM
Junior Member
Thread Starter
Join Date: Mar 2017
Posts: 12

Thank you for the help. problem fixed. New problem posted.
Old 04-10-2018, 04:06 AM
Junior Member
Join Date: Oct 2017
Location: Australia
Posts: 26

looks like you just solved my mate's car problems. Thanks for posting the solution.
Related Topics
Thread Starter
Last Post
New Member Area
03-24-2013 03:34 AM
Ford Explorer
01-20-2011 08:44 PM
General Tech
09-28-2010 03:29 AM
Ford F-250 & Ford F-350
04-02-2009 10:58 AM
Ford Focus
10-24-2006 06:28 PM

Thread Tools
Search this Thread
Quick Reply: 1989 blower speed problem

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.