Heater issues

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Mar 2, 2015 | 08:10 PM

gatorpsd

Thread Starter

Mountain Pass

Joined: Mar 2005

Posts: 128

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From: arlington tx

Heater issues

Here's what I have. 02 X 7.3L 4x4.

Heater will work fine. Then out of nowhere just blow cold. I can turn it off then back on it'll blow hot for 1 minute or 20 minutes. Then out of nowhere blow cold again. It doesn't matter if I'm highway driving or city driving.

I'm kinda thinking it may be the door in the duct that's just closing. I real don't know.

Thanks.

Mar 2, 2015 | 08:13 PM

projectSHO89

Hotshot

Joined: Jan 2004

Posts: 19,763

Likes: 1,081

From: St Louis

See HVAC FAQs. Link is in signature below.

Mar 2, 2015 | 08:21 PM

gatorpsd

Thread Starter

Mountain Pass

Joined: Mar 2005

Posts: 128

Likes: 0

From: arlington tx

Thanks. Got it.

Mar 2, 2015 | 10:42 PM

EXv10

Post Fiend

Joined: Mar 2009

Posts: 11,798

Likes: 14

From: Mt. Shasta California

It sounds like a blend or other door malfunct.

Mar 3, 2015 | 09:16 PM

wakeupluis

Senior User

Joined: Nov 2005

Posts: 162

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I think its the blend door actuator too. I had orileys special order mine. If you take yours apart and find your plastic gears are stripped let me know. I have my old one at home with good gears. You can just swap the gears if that's the case. Mine was the motor inside.

Mar 3, 2015 | 09:28 PM

william_04_x

Lead Driver

Joined: Nov 2007

Posts: 5,139

Likes: 209

Look at the following thread..

Click...

On page 2 I posted some general troubleshooting logic, and (gasp) pictures. The part number I posted for the actuator motor assy is accurate.