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  #1  
Old 07-10-2018, 11:01 AM
I miss my MBZ
 
Join Date: Feb 2003
Location: Cincinnati, OH
Posts: 533
Automotive AC work - txv and evap

Hello All,
for as many Honda Odysseys are out there, their forum support isnt helping me, so I thought I'd ask here. Some of the wisdom will cross over in MB-land Im sure.

The Harbor Freight sniffer tells me that the front Evaporator is leaking on my 2009 Honda Odyssey. I cant find any dye or oil traces anywhere outside the dashboard so I am inclined to believe it (it beeps faster in the inside airsteam and in the drain underneath the van...). caveat - it is from Harbor Freight
It looks like this *might* be a job you can do without removing the whole dashboard, but I havent found good youtubes/pdfs on how to do this - Im still looking...

Question is this: If I do this myself, should I replace the TXV (Thermal Expansion valve) at the same time ? (it is only $20 from the dealer....)
It looks like Im in for the evap coil, a small bottle of PAG oil and o-rings, but I was curious if the TXV's wear out or get old...ever.
thoughts ?

-John

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2009 Kia Sedona
2009 Honda Odyssey EX-L
1994 Miata M-edition (salvage-rebuilt)

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  #2  
Old 07-10-2018, 02:35 PM
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Join Date: Nov 2010
Location: TX
Posts: 3,725
refrigerant is heavier than air and will be evident at the evaporator drain port as its the lowest point of the evaporator coil box.

the TXV can remain working for a very long time, but whenever a system is opened, I prefer to replace the TXV and the filter drier at the same time - with high quality items.

You will need to check the honda manual for the oil charge when changing the evaporator coil - as the evaporator is a place where the refrigerant boils over, a lot of oil remains in it.
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1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)
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  #3  
Old 07-10-2018, 11:32 PM
I miss my MBZ
 
Join Date: Feb 2003
Location: Cincinnati, OH
Posts: 533
I appreciate the reponse - Im at? a quandry
in a quandry ?

-I have an appointment at the dealer for next tuesday - for them to troubleshoot/diagnose.

-Im new at the whole "halogen sniffer" game - it smelled refigerant(?) in the air vents, and at the drain last night, but tonight I cant get it to read consistently.

-The systems was leaking about a bottle every week or 10 days - thats slow, but enough to want to break things open (or make an appt at the dealer)

-a friend took some pics of the factory manual - you just remove the glove box and then a bunch of screws and everything (up to and including the evaporator) comes out in the passenger footwell
(why cant the german makes do this ?)

-I started removing stuff tonight, because boredom, and now Im looking at the evaporator
The sniffer reads nothing. No dye or colors present. the system is still closed and pressurized.

Do I break it open, get new parts on order, and start replacing stuff ? or wait a day, see if the sniffer reads stuff near the evap again ?
Or just button it back up and send it to the dealer on tuesday ?
I hate to drop $350 on parts if Im barking up the wrong tree.

-John
__________________
2009 Kia Sedona
2009 Honda Odyssey EX-L
1994 Miata M-edition (salvage-rebuilt)

(insert Mercedes here)

Husband, Father, sometimes friend =)
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  #4  
Old 07-11-2018, 12:41 PM
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Join Date: Nov 2010
Location: TX
Posts: 3,725
I have had good success with the flourescent dye to check for leaks, a leaky evap will show dye in the condensate drain puddle.

changing the evap is not too bad on an Odyssey.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)
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