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freddofrog

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from looking on the internet, "TGM" is not an A/C specialist nor a Honda specialist, no point going back there now that you've got someone else onto it
 

hei731

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He detects a very small leak in the low pressure pipe from bulkhead to inner wing join. that is the expensive part? could it be that? but he doesnt believe that would empty the system in a few days.

I was reading your air con guide for gen7, could it be the sensor or relay?

thanks
 

freddofrog

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^ if the compressor is coming on then it won't be the relay, and anyway, the relay isn't a large sum of money


here is a diagram of the system on the 8th gen diesel (click to enlarge)



here is a schematic of where the aircon components are in the 8th gen diesel (click to enlarge)


another schematic of more aircon components are in the 8th gen diesel (click to enlarge)




finally, there is an inbuilt diagnostic system on the 8th gen, very similar to the one on the 7th gen (click to enlarge)
 

hei731

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He said the low pressure pipe from bulkhead to inner wing join is the expenive part? how much rougly would that be?

Thanks for the diagrams and instruction, will sent them to him.

Thanks a lot.
 

freddofrog

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you can find parts drawings by starting here https://www.lingshondaparts.com/honda_car_parts_catalogue_C01.php

I don't know which trim level your car is, I just selected 2.2 ES - 6MT (6 speed manual transmission)

here are the thumbnail drawings https://www.lingshondaparts.com/honda_car_parts_block_selection_C30.php?mod_01=3561

aircon pipes are drawing L103 in that set of drawings, which gives the main drawing and parts list here https://www.lingshondaparts.com/honda_car_parts_selection_pfk.php?block_01=17TL1A01&block_02=B__6005&block_03=3561&block_05=hcr

note that the part numbers begin with PFKL to get Honda part numbers remove "_pfk" from the URL
https://www.lingshondaparts.com/honda_car_parts_selection.php?block_01=17TL1A01&block_02=B__6005&block_03=3561&block_05=hcr

and take your pick from the pipes/hoses and prices LOL
 

hei731

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Updated, the air con guy found the leak above the driver side of the front wheel, he used his machine to detect the gas leak and there is bing sound around it. He said the O rings were corroded. He fixed it on Monday afternoon.

It still very cold today, hopefully it will last forever,

thank you for all the help.
 

freddofrog

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glad you got it fixed in the end ;)

plenty of time for some more hot weather (I hope)
 

accord1108

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Brian,
Just seen your reply regarding the diagnostic function within the 8th gen. Thanks for this.

My air conditioning i dont think is cooling properly, there is very little change in the air temperature when it is turned on. For comparison my sisters 7th gen, the air con is far cooler.

I can hear the compressor cutting in when ac is turned on. Does the inbuilt diagnostic tool give any indication of the gas pressure/quantity. The condenser looks ok.
 

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accord1108 said:
Does the inbuilt diagnostic tool give any indication of the gas pressure/quantity.
I don't know, best thing is to try it and see if, when you advance past the 11th measurement (b - Vent Temperature Air Out) , is there a 12th measurement or does it go back to the 1st one again (1 - Mode Positioning) ?
 

accord1108

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freddofrog said:
I don't know, best thing is to try it and see if, when you advance past the 11th measurement (b - Vent Temperature Air Out) , is there a 12th measurement or does it go back to the 1st one again (1 - Mode Positioning) ?
I done this and there are two extra measurements. Results as follows at two temperature setpoints:
16°C 28°C
1 01 99
2 24 20
3 20 19
4 07 4
5 18 17
6 d3 99
7 01 99
8 00 00
9 00 00
A 58 29
B 12 75
C 06 06
D 01 01

I wonder what does the d3 indicate for measurement 6?

Do you know what measurements c and d indicate?

thanks
 

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accord1108 said:
I done this and there are two extra measurements. Results as follows at two temperature setpoints:
16°C 28°C
1 01 99
2 24 20
3 20 19
4 07 4
5 18 17
6 d3 99
7 01 99
8 00 00
9 00 00
A 58 29
B 12 75
C 06 06
D 01 01

I wonder what does the d3 indicate for measurement 6?

Do you know what measurements c and d indicate?

thanks
nice table, I like the way you've done that ;)

d3 in "6" indicates that the flap has swung slightly "negative" i.e. less than 0% . I think it's just the way the unit "reports" the flap position, nothing to worry about, it does this on flap positions on the 7th gens quite often.

I reckon that "C" is the aircon gas pressure in Bar, the 7th gen diesels often report 06 as a pressure when low on gas, operational readings on the 7th gen diesels are between 10 and 15.

no idea what "D" could be, maybe it's a "remembered" gas pressure before the A/C started ?
 

accord1108

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Thanks,be great if it's only gas that is needed,I must get this checked out,we have another car here too which also needs gas
 

julekasMobilek

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As far i understand, that magnetic valve works purerly on temperature? As i checked my engine bay, my valve does not have any wires...

Does it responsible for aircon working in the winter, to get warm air into cabin faster than without it?
 

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julekasMobilek said:
As far i understand, that magnetic valve works purerly on temperature? As i checked my engine bay, my valve does not have any wires...

Does it responsible for aircon working in the winter, to get warm air into cabin faster than without it?
I'm not sure what you've been looking at in the engine bay LOL

The magnet valve on the 7th gen is next to the pressure sensor down in front of the condenser. On the 8th gen they moved them both behind the front bumper.

There is a photo of one in 7th gen "Diagnosing Aircon Problems" and the wires are visible.

Circuit diagrams in the Honda ESM on both 7th and 8th gens show the output from the A/C control unit to the magnet valve.

Yes in the winter when the engine is cold, the system operates the magnet valve to bypass the condenser so that the evaporator becomes a heat source (see images in #33). This is because the diesel engine takes a lot longer to reach operating temperature (diesel engine has a much higher thermal mass).
 

julekasMobilek

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Hello guys, can you help me out, where to start to find out, why my aircon does not heating in winter?
This time of year is not ideal condition to test this out, but maybe there are some solutions? Aircon in summer is working perfeclty - is i set it to LO it cools completely perfect to catch a cold :)
Thank you.
 

freddofrog

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The only thing I can think of is to extend the wires on the in-car temperature sensor and the external temperature sensor, and put them in a bucket of ice. Engine must also be cold.
 

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Does the diagnostic codes indicate if the compressor is working?, i cannot hear any audible change in engine load between ac on and ac off?
 

accord1108

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^ if the compressor is coming on then it won't be the relay, and anyway, the relay isn't a large sum of money


here is a diagram of the system on the 8th gen diesel (click to enlarge)



here is a schematic of where the aircon components are in the 8th gen diesel (click to enlarge)


another schematic of more aircon components are in the 8th gen diesel (click to enlarge)




finally, there is an inbuilt diagnostic system on the 8th gen, very similar to the one on the 7th gen (click to enlarge)
Hello,
how do you open the inbuilt diagnostics again?
 
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