[Help] A/C problem Seat Toledo

[rukass]

hi
I need help with a problem in air conditioning

Model: Seat Toledo 1.9 TDI
Year: 2000
Engine: AHF
Error Code: 00792 - A/C Pressure Switch (F129)

Description:
compressor gives the signal to work, but turns off immediately. stops and starts for a minute and then the system shuts down. the fan does not work, but I think it will work only after the compressor in operation. the system has no leakage and it loaded with 750gr. replacing the switch, but the problem continues.

any idea to solve the problem?

Thanks for any help

[cristec]

What are the high and low pressure readings before and after the compressor cuts out?

[Meat-Head]

What are the high and low pressure readings before and after the compressor cuts out?

Word from 'Down The Farm' is some of these VW's have a clutchless compresser.

(99% sure in saying) If you can turn the 'inner core' of the compresser it's ~~~~ed, you need a new one

[rukass]

What are the high and low pressure readings before and after the compressor cuts out?

do not know what the pressure, where I loaded the system has no gauges to check..

the compressor ****... is very, very bad and expensive

thanks for help

[carclima]

hi
I need help with a problem in air conditioning

Model: Seat Toledo 1.9 TDI
Year: 2000
Engine: AHF
Error Code: 00792 - A/C Pressure Switch (F129)

Description:
compressor gives the signal to work, but turns off immediately. stops and starts for a minute and then the system shuts down. the fan does not work, but I think it will work only after the compressor in operation. the system has no leakage and it loaded with 750gr. replacing the switch, but the problem continues.

any idea to solve the problem?

Thanks for any help

youre switch is 2 .3 or 4 wires..?

if you start the AC fans should rotate in low speed then engage compresor and with presur raising fans starts in second speed..IF you dont have tools for measuring presure in pipes then please dont even try to fix it..you can make serious damage to car if presure raise without fans..in working hot day we speak about 12-15 bar..but if you dint have fans in order presure can raise 20 bar or even more in minute..so all work should be done with presure tester conected..
youre sistem is manual or auto ? I can help you with this IF you can measure presure.
compresor is with clutch or valve on back side? on some system you can read presure with diagnostic...

[synkrotronic]

Hi
Confirm fuses on battery,usually vag group have 3 fuses 30 A on fuse box battery.Maybe only bad contact.
Fans must always run with ac on

Regards

[rukass]

youre switch is 2 .3 or 4 wires..?

3 wires..

ok .. that will confirm that the fans can only operate after the compressor start? or before!? compressor gives the signal to start the clutch, the engine loses power but then turns off and keeps repeating over 1 minute + -

I'll try to get the measure pressure!!

fuses are ok!

Thanks to all!!

[carclima]

[QUOTE=rukass;610237]3 wires..

ok .. that will confirm that the fans can only operate after the compressor start? or before!? compressor gives the signal to start the clutch, the engine loses power but then turns off and keeps repeating over 1 minute + -

I'll try to get the measure pressure!!

fuses are ok!

ok 3 wires switch is eelctronis presure transducer,so that means you are able to read preasure via diag.IF youre switch is OK..1wire is positiv 3 is negativ 2 is signal to ecu..check power suply on switch..if power is OK measure signal wire...not sure but power for this unit have fuse.5 amp.on dash...also you can simulate this switch with potenciometer 10k..yust to see status of all AC electronic..disconect sensor put midle pin of pot.on signal wire..start from negative pole it must engage compresor and low fan speed,then fast speed.then disengage compresor if all electronic is OK...


what do you mean by this =compressor gives the signal to start the clutch, the engine loses power but then turns off and keeps repeating over 1 minute + -
this losee of power is it realy big ?like engine will shut down? can you rotate compresor cluth plate with hand?

IF compresor take to much power from engine then engine ECU will send comand for disengage compresor in order to keep engine runing and drive you home...take some tool for diag..go to ACTUATOR TEST test compresor clutch...in basic AC is simple device but you need to have some tools and knowledge..

regards!

[autocargo]

hi
I need help with a problem in air conditioning

Model: Seat Toledo 1.9 TDI
Year: 2000
Engine: AHF
Error Code: 00792 - A/C Pressure Switch (F129)

Description:
compressor gives the signal to work, but turns off immediately. stops and starts for a minute and then the system shuts down. the fan does not work, but I think it will work only after the compressor in operation. the system has no leakage and it loaded with 750gr. replacing the switch, but the problem continues.

any idea to solve the problem?

Thanks for any help

I had problems with the fan itself on VW-Audi cars before. If you have an electric fan for the A/C the electric motor maybe at fault. The brushes on motor get worn out. After that the spring itself,the ones that loads the carbon brushes still make contact with rotor and works for a while after, until the spring cut groves on rotor, sometime can't repair damage and need new fan+motor,sometime could replace carbon brushes. I would check if fan would power on when applying 12V directly to it. When fan not working the A/C system shuts down because a/c radiator gets too hot and pressure rise up on system. Check motor and post results.

[rukass]

hi ppl

first want to thank everyone who tried to help.
the problem seems to be resolved and the end still not sure what the cause of failure
confirmed the voltage on the switch, the fans, fuses, etc. .. etc. .. .. okay
I connected everything, turned on the AC .... and...works like a charm!
I do not know, maybe some bad contact or it was even bother my head

thanks to everyone