Youngsnazzy231
Member
I had pulled out a pretty steep driveway and scraped the bumper pretty good and I’m pretty sure I broke my radiator support but after that my ac stopped and fans won’t kick on any wires that could’ve gotten damaged maybe?
Ac not working
- Thread starter Youngsnazzy231
- Start date
John Wesley Hardin
Veteran Member
- Joined
- Aug 28, 2022
- Location
- Rockport Texas
- TDI
- 2003 VW Jetta 1.9 Diesel GLS , Five Speed Standard Shift
String out some barb wire call in for artillery support , man up and crawl under the vehicle , and check for damage .If the vehicle has been compromised by pavement or aggregate repair as needed. Or check back with the Forum again for a second opinion
Youngsnazzy231
Member
I have crawled under but no signs of damage. My aux fan was out maybe the other one went out after I heard once one goes the other is prone too. the radiator support is for sure broken but I was just looking for some advice
csstevej
Top Post Dawg
- Joined
- Aug 12, 2004
- Location
- north nj
- TDI
- 2001 golf tdi 4 door auto now a manual, mine, 2000 golf 2 door M/T son's,daughters 98 NB non-TDI 2.0, 2003 TDI NB for next daughter, head repaired and on road,glutton for punishment got another tdi 2001NB,another yellow tdi NB , added an 06 NB DSG
Did you hook up gages and see if you still have Freon?
John Wesley Hardin
Veteran Member
- Joined
- Aug 28, 2022
- Location
- Rockport Texas
- TDI
- 2003 VW Jetta 1.9 Diesel GLS , Five Speed Standard Shift
Check the fuses on top of the battery. The one to the far left is for the A/C fans.. Start the car turn the A/C on see if the fans are turning . Jiggle or replace the fuse. The fans should be on if the fuse is good . If not you may have other issues.
Call in close air support if needed
Last edited:
AndyBees
Top Post Dawg
- Joined
- May 27, 2003
- Location
- Southeast Kentucky
- TDI
- Silver 2003 Jetta TDI, Silver 2000 Jetta TDI (sold), '84 Vanagon with '02 ALH engine
I believe both fans out front are primary. They both operate at the same time on Low or High speeds regardless of the reason for the demand. Maybe I've missed something with respect to their identity. Hmm.
So, without the engine running, turn On the Ignition and AC (with the dash fan on any speed). Pop the hood and see if either fan is running. If the refrigerant level is above minimum pressure and there are no broken wires or a blown fuse, those fans should be running. Oh, and the Fan Control Module must be operable.
If the one fan does come on, maybe the wire(s) going to the AC Compressor were damaged? Maybe the connector at the AC Compressor was damaged. Maybe the wires were pulled out of the bundle just above the Starter. I assume the 06 has the fuse holder on top of the battery. If so, check to see if the green 30amp fuse is blown.
Maybe you should put gauges on the system if the Fans do not come on to see if you have adequate refrigerant pressure as suggested by Csstevej.
Your incident and the AC not working could possibly be unrelated and just a coincident that the system went down.
So, without the engine running, turn On the Ignition and AC (with the dash fan on any speed). Pop the hood and see if either fan is running. If the refrigerant level is above minimum pressure and there are no broken wires or a blown fuse, those fans should be running. Oh, and the Fan Control Module must be operable.
If the one fan does come on, maybe the wire(s) going to the AC Compressor were damaged? Maybe the connector at the AC Compressor was damaged. Maybe the wires were pulled out of the bundle just above the Starter. I assume the 06 has the fuse holder on top of the battery. If so, check to see if the green 30amp fuse is blown.
Maybe you should put gauges on the system if the Fans do not come on to see if you have adequate refrigerant pressure as suggested by Csstevej.
Your incident and the AC not working could possibly be unrelated and just a coincident that the system went down.
Youngsnazzy231
Member
Still nothing fuses are good no cold air and fans are showing no signs movement. so I’m guessing poor refrigerant pressure like you had said or something else because each wire harness and connections are fine. Would a photo from topside of my engine help?
Youngsnazzy231
Member
probably stupid question but i don’t know much about a/c but if I don’t have enough Freon the fans etc won’t work? Of course it won’t blow cold air.
Youngsnazzy231
Member
P2B
Top Post Dawg
With key on, blower on, and AC on both fans should run at low speed even if there is no refrigerant at all. Low refrigerant will prevent compressor engagement but does not affect fans.
This guide is specifically for MK4 but most of it is applicable to your MK5:
Check your radiator/condenser fan operation NOW
Mk IV Manual AC electrical & cooling fan troubleshooting and repair Now is the time of the year to check that your pair of electric fans that provide cooling for both the radiator and air conditioner condensor are functioning. Do not needlessly age your Air Conditioning compressor by running it...
AndyBees
Top Post Dawg
- Joined
- May 27, 2003
- Location
- Southeast Kentucky
- TDI
- Silver 2003 Jetta TDI, Silver 2000 Jetta TDI (sold), '84 Vanagon with '02 ALH engine
The Ambient Temp Sensor could be faulty or the wires going to it could have been chewed by a critter. Happened to me.
A set of manifold gauges would certainly be helpful.
P2B, when I installed a new AC Compressor on my 03 Jetta in the late Spring of 2022, the Fans would not come On until there was minimum spec refrigerant pressure. In fact, after "letting" about 75% of the "warmed" first can of 134a into the system, the AC Compressor would not kick-On. So, I hot wired it to help pull-in the refrigerant. As it pulled in the refrigerant the Fans would kick-On and Off until there was enough pressure to satisfy the pressure switch. At that point, I removed the hot-wire and proceed to charge the system. It has served me well.
It has been a while since I looked at the wiring schematics of the AC system for an A4. But, I am thinking there is only one set of contact points in the Fan Control Module (FCM) that provides power to both the Compressor and the Fans. That's, in part, why the one green 30amp fuse gets so hot. Most of us have seen the damage when that fuse heats-up and distorts it's holder. That same set of contact points handle the circuit from the Coolant Temperature Sensor/Switch on the radiator. That circuit is entirely separate from the AC circuits accept going through the FCM to the Fans when activated by the Switch.
A set of manifold gauges would certainly be helpful.
P2B, when I installed a new AC Compressor on my 03 Jetta in the late Spring of 2022, the Fans would not come On until there was minimum spec refrigerant pressure. In fact, after "letting" about 75% of the "warmed" first can of 134a into the system, the AC Compressor would not kick-On. So, I hot wired it to help pull-in the refrigerant. As it pulled in the refrigerant the Fans would kick-On and Off until there was enough pressure to satisfy the pressure switch. At that point, I removed the hot-wire and proceed to charge the system. It has served me well.
It has been a while since I looked at the wiring schematics of the AC system for an A4. But, I am thinking there is only one set of contact points in the Fan Control Module (FCM) that provides power to both the Compressor and the Fans. That's, in part, why the one green 30amp fuse gets so hot. Most of us have seen the damage when that fuse heats-up and distorts it's holder. That same set of contact points handle the circuit from the Coolant Temperature Sensor/Switch on the radiator. That circuit is entirely separate from the AC circuits accept going through the FCM to the Fans when activated by the Switch.
P2B
Top Post Dawg
That's odd, my son's wagon has a bypass pulley instead of a compressor and his fans still run - but I haven't checked whether they stop once you start the engine.
The compressor coil fuse is #16 on the panel by the driver's door. Pretty sure the compressor and fans are powered independently.
Last edited:
AndyBees
Top Post Dawg
- Joined
- May 27, 2003
- Location
- Southeast Kentucky
- TDI
- Silver 2003 Jetta TDI, Silver 2000 Jetta TDI (sold), '84 Vanagon with '02 ALH engine
If I am not mistaken, I believe I had to do the same thing with my formerly owned 2000 Jetta (my son owns it) when I changed the TXV a couple of years ago to get the AC Compressor to pull in coolant.
Anyway, looking at the Bentley Schematics that I copied and enlarged:
Yes, you are correct about Fuse 16 providing power to the AC Compressor Coil. But, the power is routed through the FCM. So, there may be another relay internal of the FCM. That's why I said I couldn't remember for sure. (And, I've never broke apart a FCM...LOL)
And, Fuse 180 (green 30amp fuse) provides power to the two Fans simultaneously whether via the AC system or the Thermo Switch on the radiator and on low or high speed.
But, to the OP, we've been primarily talking about the A4 which is through the 04 model. Your 06 is different, however, likely very similar. But, you need to start eliminating possibilities to sort it out.
Looking for Fans to fit the 06........... it appears the FCM is part of the Fan, not unlike later model VAG vehicles, such as my 2011 Tiguan. In fact, I don't think it is a replaceable part. It is located on the back of the Left Fan which is referred to as the Primary Fan (and a lot more expensive).
Anyway, looking at the Bentley Schematics that I copied and enlarged:
Yes, you are correct about Fuse 16 providing power to the AC Compressor Coil. But, the power is routed through the FCM. So, there may be another relay internal of the FCM. That's why I said I couldn't remember for sure. (And, I've never broke apart a FCM...LOL)
And, Fuse 180 (green 30amp fuse) provides power to the two Fans simultaneously whether via the AC system or the Thermo Switch on the radiator and on low or high speed.
But, to the OP, we've been primarily talking about the A4 which is through the 04 model. Your 06 is different, however, likely very similar. But, you need to start eliminating possibilities to sort it out.
Looking for Fans to fit the 06........... it appears the FCM is part of the Fan, not unlike later model VAG vehicles, such as my 2011 Tiguan. In fact, I don't think it is a replaceable part. It is located on the back of the Left Fan which is referred to as the Primary Fan (and a lot more expensive).