Climatronic problem

[aladin]

Hello ,

 

My Octavia MK2 1.6 MPI Elegance is delivering very poor air conditioning performance , the factory fitted compressor failed years ago and was replaced with a non-genuine one (a compressor for an old Mercedes E300 w123 I guess) and it worked perfectly for years

 

Last summer , performance became poor and it was tested by an expert who suggested: 1. Changing the compressor (very expensive) 2. To do what he called "a stimulation of the compressor" which I had no idea what it meant , we chose the second option and enjoyed a cool summer

 

This year the problem is there again , but this time I did the diagnostics myself, I got the following results in brief:

1 – 1 External Temperature           29.7 °C 9 – 0 Evaporator temperature        2.0 °C 10. Evaporator Temperature Actual
10 – 0	Evaporator Temperature       18.6	°C
10 – 1	Liquid refrigerant pressure      6.4	bar
10 – 2	Liquid refrigerant temperature  20	°C
	11. AC Compressor
11 – 0	Power set point      82	mA
11 – 1	Power actual          82	mA
11 – 2	Power maximum      82	mA
11 – 3	Compressor PWM      84	Digital (0-200)
11 – 4	Power offset compressor     9
11 – 5	Power value         45	Digital
11 – 6	Compressor code       0

When I turn on/off climatronic the rev counter (RPM) slightly increases/decreases and the fan operates normally

 

1.Does the diagnostic values indicate any failures of the compressor ?

2.What is causing the evaporator to have such a high temperature (18.6 C while set point in 2.0 C) ?

3. Is the refrigerant pressure normal (6.4 bar and increases to about 7.2 while the car is moving at low speeds) ?

4.What kind of "Stimulation" was performed last year to make the compressor works more efficiently ?

5. Finally , if fitting a new compressor is inevitable , what is the estimated cost of a non-genuine second-hand compressor in USD ?

 

Any help would be much appreciated , thanks in advance

Best wishes

 

 

[Papfox]

Comment removed. I really don't know what I'm talking about.

Edited 30 April, 2017 by Papfox

[Ecomatt]

I would always pay extra and get genuine parts fitted. When I purchased my car the air conditioning was not working and the garage fitted a cheap compressor. It lasted 6 months before it faulted and now I have a genuine pump fitted and it hasnt faulted at all and works more efficiently. The non genuine pump never seemed to get icy cold like the one I have fitted now. 

I always think if you pay cheap, you pay twice. 

Edited 1 May, 2017 by Ecomatt
Spelling error

[TK699]

I have no idea about the values above but I've recently had an issue that I've now fixed with the air con.

 

My high pressure switch was faulty plus it was leaking. Had a regass at Kwik Fit and found the leak was at the switch. Plus scanning the car found the switch was also faulty.

 

Changed switch and had the car gassed again and it nice and cold.in the car now.

 

When I switch between aircon bot off and on I don't notice any change in revs. Chatting to an aircon specialist a few weeks back he suggested the revs wouldn't change.

 

He did say something about having to clear the fault codes after the switch is replaced or it won't kick in.

 

Are there any faults coming up for the pressure switch?