AC not cooling

[galdrey]

Hello everyone

I have a problem with my AC. When I get in to the car and drive for 10 minutes the AC works just fine, it cools normally. But when I drive for more than 15 minutes the AC doesn't cool anymore.

When the car is cold I can listen perfectly how the compressor clutch engines. When the car gets a little hotter the compressor clutch doesn't engine.

Is it related to some kind of sensor or maybe a relay?

Thanks,

[D2Beetle]

Yep, I'm thinking one of the A/C sensors; perhaps the one in the radiator. Are the A/C fans working?

[galdrey]

Yes, the fans are working just fine

[D2Beetle]

Originally Posted by galdrey

Yes, the fans are working just fine

There are two modes, both at once and singly, does your work in both modes?

[galdrey]

Originally Posted by D2Beetle

There are two modes, both at once and singly, does your work in both modes?

The fans are working fine in both at once mode... How can I test it in singly mode?

[D2Beetle]

Originally Posted by galdrey

The fans are working fine in both at once mode... How can I test it in singly mode?

You do it with the coolant fan control module; it is on the drivers side just behind the blinker. It is a rectangular shape box with to large connectors, one goes to the radiator sensor and the other to the fans.

I know how to do it on a '98, what year is your NB?

[kcfoxie]

Originally Posted by D2Beetle

You do it with the coolant fan control module; it is on the drivers side just behind the blinker. It is a rectangular shape box with to large connectors, one goes to the radiator sensor and the other to the fans.

I know how to do it on a '98, what year is your NB?

I have a 98 that's doing this, for my own purposes, could you post how to test and/or fix?

Mine runs for a minute or two then the compression turns off, it's filled with gas....

[D2Beetle]

Originally Posted by kcfoxie

I have a 98 that's doing this, for my own purposes, could you post how to test and/or fix?

Mine runs for a minute or two then the compression turns off, it's filled with gas....

I should have just posted that last night as I went to all the trouble to look it up again anyway; so when I get home later tonight I'll post it.

[kcfoxie]

Thank you!

[galdrey]

Great, now I have more problems...Now my NB is getting very hot after 10 min, I've already changed the entire engine coolant. I think all these problems are related...Guys I need your help...

[Smileybug]

More info on the car...year? Miles? Could be a water pump or thermostat.

[galdrey]

These are the details of my NB:

Aprox 60200 miles
Beetle GLS AT 2.0 2005

[Smileybug]

Also, when you did the coolant, what type did you put in it?

[galdrey]

G12 the red/pink one...

[Smileybug]

How's the coolant level? Are you noticing any leaking? My bet would be a water pump or thermostat. At 60k miles, you are about needing the timing belt/water pump service even if its not a failed pump.

[galdrey]

The coolant level is ok and there are no leaks. The thermostat can cause the overheating and AC problem?

[Smileybug]

Another question is if your fans are coming on. If they aren't working, it could lead to overheating.

[galdrey]

Yes they are coming on when I turn on the AC and also when the car gets heated...

[D2Beetle]

OK here is the fan test procedure for 98' thru '05 ...

First check fuses#3 and #8 on top of the battery for melting and fuse # 16 in the driver side dash fuse box.

1) Disconnect the radiator thermo-switch sensor; driver side bottom of radiator.
2) Make jumper wire with an in line fuse so you do short out the fan control module.
3) Use the jumper wire to connect the red wire and the red/white striped wire.
4) Both fans should run at the lowest speed.
5) Next connect your jumper wire to the red wire and the red/yellow striped wire; both fans should run at the highest speed.

For testing a 2005 NB the procedure is the same except that it uses numbers to identify which wire connector terminals to connect. Read this thread for the connector terminal layout.

1) Using your jumper wire connect terminals one and two; the fans should run at the lowest speed.
2) Using your jumper wire connect terminals two and three; the fans should run at the highest speed.

If either fan does not work check the following...
1) Broken or frayed wires/connectors
2) Thermo-switch sensor
3) Fan Control Module

[kcfoxie]

THANK YOU! Will be tinkering with this over the weekend.