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Old 01-05-2017, 02:27 PM   #1
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Heater stops blowing and starts again

Today my heater stopped blowing air, even though it was still on, and then hot air started again?

any ideas? 2003 TJ

Thanks
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Old 01-05-2017, 02:51 PM   #2
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It might be the beginning of what will end up being a complete failure. Most of the time when you lose all speeds at the same time it is a melted/overheated connector at the 3 wire connector on the mode selector switch. Here is a link to a troubleshooting procedure for the complete HVAC blower circuit.

TJ Wrangler Auto Electric Help Regarding The Blower Fan?


If you have recently replaced the blower motor it may be a different issue.

Blower cuts out only on HIGH

Why does my blower motor randomly die? - JeepForum.com

Blower cuts out on all speeds

1997 tj (HVAC Controls) - Page 2 - JeepForum.com


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Old 01-06-2017, 09:43 AM   #3
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Thanks Rubi 4. When it does shut off, I can still hear it, but it doesn't blow at any of the 4 speeds. Perhaps its the fan blower speed switch?

Thanks Todd
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Old 01-06-2017, 09:52 AM   #4
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I would pull the heater switch console and check the connections in the back. (just takes a few minutes to do). Melted connectors are a common problem.

HVAC Melted connector
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Old 01-06-2017, 12:24 PM   #5
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As noted in the link I gave above, the speed is controlled through the ground side of the circuit. When you change the speed switch setting the resistor increases or decreases the resistance through the circuit which affects the blower speed. If you have a bad connection somewhere in the ground path you could be getting increases resistance & a much slower speed. The most likely places to get that happening is at the motor or mode switch connections. It can definitely start as an intermittent thing then gat worse & finally quit completely.

As Dextreme says, you should pull the panel to check the wiring/connectors. Good photos in his link too.

Also try wiggling the connector to the motor. Sometimes the terminals there get a bit loose fitting causing high resistance & eventually melting as happens at the switches. Here is an example.


Intermittent operation, all speeds—bad motor connector (found at post 32)

The infamous Blower motor/Switch/Resistor problem... should be quick - Page 2 - JeepForum.com
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Old 01-07-2017, 06:31 PM   #6
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Quote:
Originally Posted by Devildog1 View Post
Thanks Rubi 4. When it does shut off, I can still hear it, but it doesn't blow at any of the 4 speeds. Perhaps its the fan blower speed switch? Thanks Todd
Explain what you mean by you can still hear it. Does that mean you can hear the fan running but there's no air coming out of the vents?
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Old 01-11-2017, 04:03 PM   #7
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Heater Blower Issue

All good suggestions. Had a similar issue on my 2000 TJ. Turns out the connector to the blower relay behind the glove box had come unseated when i was doing some work behind the dash. A good squeeze on the connector and a push on the red tab cured all that ailed.
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Old 01-12-2017, 07:36 AM   #8
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Research as suggested above but do you also lose wiper/radio power when the blower is not working? If you do, try wiggling the ignition key to see if it will kick on. Unfortunately, add a bad ignition switch to the items above as common electrical related issues on a TJ.

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