A/C control-fan motor-up-down WTF
Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
A/C control-fan motor-up-down WTF
At the begining of my project few of you recommended to me to change the A/C control vacumm lines plugs to fix the air from blowing from the bottom only while the A/C was at on at the regular setting (pictures below).
Yesterday, the air still blows from the bottom only. The defroster works properly.
Please give me direction here
Is it the dash board A/C control?
Is it the vacumm line under/next to the heater core?
Yesterday, the air still blows from the bottom only. The defroster works properly.
Please give me direction here
Is it the dash board A/C control?
Is it the vacumm line under/next to the heater core?
Instructor
Joined: Oct 2007
Posts: 151
Likes: 1
Genneraly, If your fan if only blowing through the defroster and heater vents ( This is the default position ) It's "usually" one of two problems.
First, Check the three way vacuum check valve in the engine compartment. It's on the passenger side. Let me know if you need help finding it. This vacuum check goes to the Cruise control and also to the vacuum controller under the dash. For the most part, I can say that if your cruise control dosen't work, It's probably the check valve.
If your cruise control does work, It's most likely the vacuum controller connector. the vacuum controller is located under the dash ont he drivers side just above the gas pedal. The littlenipples on the connector close off after some time and you will need to replace the connector, not the box. I have already replaced mine and it now works great. post back and let me know what you find. I can guige you the relavent posts to fix the problem. good luck
First, Check the three way vacuum check valve in the engine compartment. It's on the passenger side. Let me know if you need help finding it. This vacuum check goes to the Cruise control and also to the vacuum controller under the dash. For the most part, I can say that if your cruise control dosen't work, It's probably the check valve.
If your cruise control does work, It's most likely the vacuum controller connector. the vacuum controller is located under the dash ont he drivers side just above the gas pedal. The littlenipples on the connector close off after some time and you will need to replace the connector, not the box. I have already replaced mine and it now works great. post back and let me know what you find. I can guige you the relavent posts to fix the problem. good luck
Drifting
Joined: Nov 2005
Posts: 1,324
Likes: 5
From: Charlotte NC
If your cruise control does work, It's most likely the vacuum controller connector. the vacuum controller is located under the dash ont he drivers side just above the gas pedal. The littlenipples on the connector close off after some time and you will need to replace the connector, not the box. I have already replaced mine and it now works great. post back and let me know what you find. I can guige you the relavent posts to fix the problem. good luck
Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
Genneraly, If your fan if only blowing through the defroster and heater vents ( This is the default position ) It's "usually" one of two problems.
First, Check the three way vacuum check valve in the engine compartment. It's on the passenger side. Let me know if you need help finding it. This vacuum check goes to the Cruise control and also to the vacuum controller under the dash. For the most part, I can say that if your cruise control dosen't work, It's probably the check valve.
If your cruise control does work, It's most likely the vacuum controller connector. the vacuum controller is located under the dash ont he drivers side just above the gas pedal. The littlenipples on the connector close off after some time and you will need to replace the connector, not the box. I have already replaced mine and it now works great. post back and let me know what you find. I can guige you the relavent posts to fix the problem. good luck
First, Check the three way vacuum check valve in the engine compartment. It's on the passenger side. Let me know if you need help finding it. This vacuum check goes to the Cruise control and also to the vacuum controller under the dash. For the most part, I can say that if your cruise control dosen't work, It's probably the check valve.
If your cruise control does work, It's most likely the vacuum controller connector. the vacuum controller is located under the dash ont he drivers side just above the gas pedal. The littlenipples on the connector close off after some time and you will need to replace the connector, not the box. I have already replaced mine and it now works great. post back and let me know what you find. I can guige you the relavent posts to fix the problem. good luck
I already replaced the vacuum controller connectors. see picture
Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
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Thread Starter
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20