I have a problem with RPM PLZ help me

[rational]

Hello to all

I got a problem , when I turn ignition on then turn the A/C on, the RPM playing between 5 and 10 (up down up down etc...) , but if i stoped the A/C the RPM will be normal ,

also , when I turn ignition on then turn the A/C on, the RPM playing between 5 and 10 (up down up down etc...) , Until the A/C external 2 Fans worked then the RPM will be normal !!!!

I removed the blug for Fan sensor , withen 1 menute the RPM returnd to play (5-10 up down up down) , then I returned the plug for fan sensor the RPM return Normal way

please any expert can help me

Note : my Car is C280 - 1996
Also i replace these parts (oil + filter -- gear oil + filter -- thermostat -- i checked all fuses --- Fuel filter --- 6 Bosch Spark Plugs)

there is no problem of high tempruter or huge fuel consuming or A/C cooling or no car smoke --- the car is perfect




Thnaks 4 all ​

 

[Sp!ke]

Hmm...

 

[recycled]

he probably is not a native speaker

 

[Sp!ke]

OK, on a serious note, it sounds like the 'blug' for the sensor fan is the key here. Possibly a faulty temperature sensor?

In any event, it will probably save you a lot of time and probably a fair chunk of money to get your car checked for error codes to help pinpoint the problem.

 

[rational]

Hmm...

the issue not how is my language , the issue in my car

he probably is not a native speaker

you are sure am not native speaker .... thank you

OK, on a serious note, it sounds like the 'blug' for the sensor fan is the key here. Possibly a faulty temperature sensor?

In any event, it will probably save you a lot of time and probably a fair chunk of money to get your car checked for error codes to help pinpoint the problem.

thank you Sir , do you advice to change the fan sensor ??? current sensor is 85 c , if i change it to 65 c or 70 c thus will not effect to car ?? i live at the hotest country in the world "Saudi Arabia" the tempreture this day was about 35 c but in june and july will be more than 50 c (

 

[rational]

please help

after doing the Self-Diagnostic using Climate control, then i found these errors

232 ----> Refrigerant pressure sensor
421 ----> Pulse module

can any expert now help me ????
where these componet located in the car ?

thanks in advance