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2002 LWB LHD G400 CDI
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149 Posts
Discussion Starter #1
Hello,
I have G400 CDI 2002.
the A/C compressor do not engage neither the fan.

1. I checked gas pressure in the system - OK.
2. the blower is working fine.
3. heating is working fine (ie flaps working)
4. the light goes on and off on the AC button in the climate control.
5. checked fuses - OK.

- does anyone know this problem?
- can anyone point the AC relay?
- can anyone help with AC electric diagram (I dont have WIS yet).

Thx a lot
 

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96 G300DT
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2,029 Posts
The Star diagnosis will tell you exactly what the AC computer thinks is wrong. Without that diagnosis you are just guessing and throwing parts at it.
 

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2001 G400CDI
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322 Posts
By the front fan you mean the big engine cooling fan? Mine had the insulators from the wires (of the fan socket) broken for 20-30 cm. They almost made a short-circuit. I'm glad I noticed that just in time. It might not be that obvious, but if the black insulator tape comes off easily, then the wires are in danger of short.
I think it might be related to AC.
 

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2002 LWB LHD G400 CDI
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149 Posts
Discussion Starter #4
Hi
thx for your replies.
I could not get a Star system so I went to a guy with CARMAN.

I found 3 codes on the AC system:

B1588 fresh and recirculated air flaps actuator is stiff or blocked
B15A8 M2/10 (left footwell flap actuator) (mechanical)
B1653 fault in CAN comm. with control unit DCM-RR

after reading the codes, I erased them, and restart the car.
only the B15A8 code reappear.

now the AC compressor is working and the air is cold, but the air flow on the left side is weaker than the right side.

- what does the B1653 code mean?
- are the flaps actuators located behind the Comand system at the bottom?
- can I release stiff ones?
- do you know a MANN filters (or other) replacement P/N for the AC filter?


thx
 

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Registered
2002 MB G400CDI-1992 MB 300E-24- 2005 Mini Cooper S
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362 Posts
Hi
thx for your replies.
I could not get a Star system so I went to a guy with CARMAN.

I found 3 codes on the AC system:

B1588 fresh and recirculated air flaps actuator is stiff or blocked
B15A8 M2/10 (left footwell flap actuator) (mechanical)
B1653 fault in CAN comm. with control unit DCM-RR

after reading the codes, I erased them, and restart the car.
only the B15A8 code reappear.

now the AC compressor is working and the air is cold, but the air flow on the left side is weaker than the right side.

- what does the B1653 code mean?
- are the flaps actuators located behind the Comand system at the bottom?
- can I release stiff ones?
- do you know a MANN filters (or other) replacement P/N for the AC filter?


thx

I have changed the A/C cabin filter with a MANN, because i couldnt find the original, I yet put a regular one, not a microparticle carbon one, cant recall the part number though.
 

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Registered
2002 LWB LHD G400 CDI
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149 Posts
Discussion Starter #6
Hi

this is great tip.

I attached the cross reference for G400 CDI for MANN filters for anyone who will need it.

also, I found a very nice interface on MANN website that helps finding filters -
MANN-FILTER Catalogue Europe (Online)

(if the link will die with time, google : "mann filters cross reference")

cheers
 

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2002 LWB LHD G400 CDI
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149 Posts
Discussion Starter #7
Problem solved!

Just for future use of other members here:
After replacing many parts and sensors, I found that the fan module was bust.

Checking the module a few times in the last years the fan was spinning at all speeds when we tried it using Star diagnose system and went to full-speed when we disconnected the coolant temp sensor and yet the fan was only spinning lowest speed when it was connected normally. (that's the reason I spent 6 years before replacing it.. and now that it was the last part to replace I found that it is it - 1000Euros for genuine one made by Bross..)
Strange that the lowest speed was enough for the engine coolant but not to the A/C system..

Anyhow, it is now cold and dry inside the car :)

thank you all for your help.
 
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