2004 rear fan

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

OP
OP
G

Gnarley

TYF Newbie
Joined
Jan 14, 2021
Posts
19
Reaction score
1
Sounds like it did a calibration itself. That’s great.

Yeah, except it only wants to blow cold from the rear, if I leave the rear blend actuator connected. I set the flap to heat and reset the gears to stay on heat and closed it up and did not plug the connector as I determined it will not stay on the heat if plugged in, so what would cause that?

Thanks
 

Rocket Man

Mark
Supporting Member
Joined
Dec 25, 2014
Posts
25,961
Reaction score
50,621
Location
Oregon
Yeah, except it only wants to blow cold from the rear, if I leave the rear blend actuator connected. I set the flap to heat and reset the gears to stay on heat and closed it up and did not plug the connector as I determined it will not stay on the heat if plugged in, so what would cause that?

Thanks
Try the calibration that I linked to in the tech section.
 

Doubeleive

Wes
Supporting Member
Joined
Nov 7, 2017
Posts
23,399
Reaction score
34,024
Location
Stockton, Ca.

Doubeleive

Wes
Supporting Member
Joined
Nov 7, 2017
Posts
23,399
Reaction score
34,024
Location
Stockton, Ca.
Yeah, except it only wants to blow cold from the rear, if I leave the rear blend actuator connected. I set the flap to heat and reset the gears to stay on heat and closed it up and did not plug the connector as I determined it will not stay on the heat if plugged in, so what would cause that?

Thanks
watch the actuator gear on the actuator that is closest to the blower motor, when you adjust hot to cold or vica-versa you should see it rotate, if it does not rotate then replace it.
as you turn the heat adjust you should see the actuator move usually about 1/4 turn if set to a middle temp and it should stay there unless you adjust the temp more, if it rotates fine and appears to be adjusting on it's own (like to cold when you have it set to hot) then you may have a bad ambient air sensor in the headliner.
 
Last edited:
OP
OP
G

Gnarley

TYF Newbie
Joined
Jan 14, 2021
Posts
19
Reaction score
1
I followed the instructions below. Same results, the rear blend door moves to cold and will not adjust. Thoughts?

1. Start the engine and turn all the controls to the off position, (rear controls too if they're acting up), temp turned all the way down.

2. Shut off the engine.

3. Remove the positive battery terminal and leave it off for 10 minutes.

4. When it's time to reconnect it, touch it to the negative battery terminal to make sure any residual electricity is discharged.

5. Start the engine and DO NOT TOUCH THE HVAC CONTROLS FOR 5-10 MINUTES!
 

Rocket Man

Mark
Supporting Member
Joined
Dec 25, 2014
Posts
25,961
Reaction score
50,621
Location
Oregon
I followed the instructions below. Same results, the rear blend door moves to cold and will not adjust. Thoughts?

1. Start the engine and turn all the controls to the off position, (rear controls too if they're acting up), temp turned all the way down.

2. Shut off the engine.

3. Remove the positive battery terminal and leave it off for 10 minutes.

4. When it's time to reconnect it, touch it to the negative battery terminal to make sure any residual electricity is discharged.

5. Start the engine and DO NOT TOUCH THE HVAC CONTROLS FOR 5-10 MINUTES!
Could have a bad ambient air temp sensor like Wes said or the actuator might be bad.
 
OP
OP
G

Gnarley

TYF Newbie
Joined
Jan 14, 2021
Posts
19
Reaction score
1
I previously swapped the actuators and when the blend actuator that controls the hot and cold was moved into the outlet control in the front it operated as expected and the one from the front now in the rear position controlling the blend door went right to the cold position.

By substitution both actuators are working as expected and correct. So an ambient temp sensor could do that, what about the control module or whatever the component is that tells the actuator what to do?
 

Rocket Man

Mark
Supporting Member
Joined
Dec 25, 2014
Posts
25,961
Reaction score
50,621
Location
Oregon
I previously swapped the actuators and when the blend actuator that controls the hot and cold was moved into the outlet control in the front it operated as expected and the one from the front now in the rear position controlling the blend door went right to the cold position.

By substitution both actuators are working as expected and correct. So an ambient temp sensor could do that, what about the control module or whatever the component is that tells the actuator what to do?
It’s controlled from one of 2 different control heads either from the back of the console if the front one is set to Aux or from the front one if it’s not. If it’s doing the same thing no matter which control head it’s being run from then that answers your question.
 
OP
OP
G

Gnarley

TYF Newbie
Joined
Jan 14, 2021
Posts
19
Reaction score
1
It’s controlled from one of 2 different control heads either from the back of the console if the front one is set to Aux or from the front one if it’s not. If it’s doing the same thing no matter which control head it’s being run from then that answers your question.

It didn't answer my question, I don't know what I should consider replacing
 

Rocket Man

Mark
Supporting Member
Joined
Dec 25, 2014
Posts
25,961
Reaction score
50,621
Location
Oregon

Forum statistics

Threads
128,784
Posts
1,805,343
Members
91,762
Latest member
DenaliRoyal
Top