2003 Tahoe 5.3
Dear BL: when i turn on the a/c it makes a clicking noise
and it only gets cold if you are driving and rear ac does not get cold
at all as long as you are driving it is cold in front but if you stop at
a light it does not stay cold and you can still hear the clicking sound
thank-you
BL:
Todays ac systems can be very complicated. Some systems use several controllers,
sensors, switches, relays and modules. Especially automatic, dual zone, and front/rear
systems.
To start with the basics, low freon charge is usually the reason for insufficient cooling.
Normally low freon charge will give poor cooling under all driving conditions.
You mentioned a clicking noise. If it is repetitive and coming from the dash area, a common
problem is one of the blend/mode door actuator motors.
Sometimes when they fail, they randomly search for a position.
There are also a few bulletins for ac problems.......
1- The low pressure cycling switch in the receiver/dryer may malfunction. Sometimes a lite
tap can help diag.
2- Adding an auxiliary fan in front of condenser
3- May also be a control head reprogram update.
Would recommend having a dealer technician look at it. There may be trouble codes stored,
and a technician will most likely have to look at several different data parameters to diag.
properly.
Back
Dear BL: when i turn on the a/c it makes a clicking noise
and it only gets cold if you are driving and rear ac does not get cold
at all as long as you are driving it is cold in front but if you stop at
a light it does not stay cold and you can still hear the clicking sound
thank-you
BL:
Todays ac systems can be very complicated. Some systems use several controllers,
sensors, switches, relays and modules. Especially automatic, dual zone, and front/rear
systems.
To start with the basics, low freon charge is usually the reason for insufficient cooling.
Normally low freon charge will give poor cooling under all driving conditions.
You mentioned a clicking noise. If it is repetitive and coming from the dash area, a common
problem is one of the blend/mode door actuator motors.
Sometimes when they fail, they randomly search for a position.
There are also a few bulletins for ac problems.......
1- The low pressure cycling switch in the receiver/dryer may malfunction. Sometimes a lite
tap can help diag.
2- Adding an auxiliary fan in front of condenser
3- May also be a control head reprogram update.
Would recommend having a dealer technician look at it. There may be trouble codes stored,
and a technician will most likely have to look at several different data parameters to diag.
properly.
Back
| Was this information helpful? Is this what you have been searching for? Why not make a small donation to help keep us going. The guys work hard everyday to try and help people like you searching for help on the web. LEARN HOW |
Other related articles: