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location of o/t Pages: 12

snowbear on Tue September 25, 2007 3:53 PM User is offline

Year: 1996
Make: Fleetwood
Model: bounder
Engine Size: 7.4
Refrigerant Type: 134a
Ambient Temp: n/a
Pressure Low: n/a
Pressure High: n/a
Country of Origin: United States

Hi everybody.... looking for the o/t for this unit, can't seem to find it on this motor Home, looked
all over the unit and I must not be looking in the right place....need some help on this one..

I thought the tube would be between the cond and the evap but can't seem to locate it... I have
some noise in the compressor and want to change the compressor and the dryer and the o/t if I
can find it...

THanks for your help...

Andy

Chick on Tue September 25, 2007 4:00 PM User is offlineView users profile

First, you need to be sure it's an O tube system. If it is, the O tube will be between the condenser and evap, and it will have an "accumulator" on the suction line, between the evap and compressor. if it's an expansion valve system it will have a "rier" on the high side of the system..Once you know for sure which it has, it's easier to help.. But if it's an O tube system, it will be at the point in the lines where it turns cold from hot..Could be in the evap inlet??

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

chris142 on Tue September 25, 2007 10:35 PM User is offline

Should be an expansion valve if it's an add on system.

snowbear on Wed September 26, 2007 9:34 AM User is offline


Good morning,

Thanks for the info... It is a GM system not an add on and for the life of me I can't seem to find
the O tube...one side of the dryer goes to the evap and the other goes to the condenser, I don't
see a expansion valve on this system....I opened the line at the evap (between the evap and the
inlet of the dryer) there is nothing there....HELP...

Thanks....Andy

mk378 on Wed September 26, 2007 10:57 AM User is offline

A CCOT system just has a straight pipe (with the OT in it somewhere) between the condenser and evaporator. The accumulator/drier is between the evaporator and compressor on the low side (large tubing). If you have a drier on the high side and a straight pipe from the evaporator to the compressor on the low side, it is a TXV system.

On their CCOT systems, GM tended to place the OT back away from the evaporator to make it quieter inside the cab. It could even be all the way back at the condenser.

Chick on Wed September 26, 2007 11:49 AM User is offlineView users profile

Quote
Originally posted by: snowbear
Good morning,



Thanks for the info... It is a GM system not an add on and for the life of me I can't seem to find

the O tube...one side of the dryer goes to the evap and the other goes to the condenser, I don't

see a expansion valve on this system....I opened the line at the evap (between the evap and the

inlet of the dryer) there is nothing there....HELP...
------------------------------------------------------------------------------------------------------------------------------

You are describing a expansion valve system.."Drier" between condenser and evap..An O tube sytem, the accumulator/drier is between the evap and "compressor" Hope this helps..
Pics would help....



-------------------------
Chick
Email: Chick

---------------------------------------------

Freedoms just another word for nothing left to lose

Edited: Wed September 26, 2007 at 11:53 AM by Chick

snowbear on Wed September 26, 2007 12:03 PM User is offline


Hi..

Okay, let me see if I can explain what I see...from the compressor a line goes to the condenser, (at the
top) Than they are two lines close to the bottom of the condenser that go to the oil filter they are like
5/8" lines. than on the other side of the condenser there us a line 5/16 going to the accumulator.
from The other side of the accumulator a 5/16 line goes to the evap, out of the evap a large hose goes to
the compressor. It looks like the condenser is a split system and the top half is A/C and the bottom
half is oil cooler....???? ( don't know ) I don't see a straight pipe at all.....could the O tube be at the
compressor...???

snowbear on Wed September 26, 2007 12:13 PM User is offline


I missed a post from Chick, Sorry... It must be an expansion valve system, but I don't see the
expansion valve....???Where would that valve be...

mk378 on Wed September 26, 2007 2:37 PM User is offline

Valve would have to be under the dash if it isn't visible under the hood. Maybe there's a block type TXV mounted right at the firewall, it may look like part of the evaporator. Both lines go into a block, also there's usually a diaphragm type thing on the side of the block.

Chick on Wed September 26, 2007 2:43 PM User is offlineView users profile

it will be attached to the evaporaotor. There are different types of expansion valves, some look like this one while some look like this one with variations of these.. A pic of the lines going into your evap may help, or you need to expose the evap and see if it's attached to the inlet line (bottom line of evap)

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Chick on Wed September 26, 2007 2:46 PM User is offlineView users profile

Oh, and the oil and or trans cooling lines will be going into the radiator, not the condenser....

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

snowbear on Wed September 26, 2007 4:41 PM User is offline


Hi..

Thats what I thought also that the oil or cooling lines went to the radiator, but as I checked them
out they were going to the condenser. I went under the Motor Home again and looked at it hoping
I was wrong...but no change... still going to lower part of the condenser. The two lines go to the
oil filter block, I never seen a set up like this...I can take pictures of it but how do I send them to
this page....or forum...

Chick on Wed September 26, 2007 5:06 PM User is offlineView users profile

Send them to my e-mail address and I'll post them for you. I think you are looking at a "oil cooler" and not the condenser..never heard of anything running thru the condenser other than refriigerant...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

snowbear on Wed September 26, 2007 5:24 PM User is offline


Ok.. will do...I'll do this in the morning and send them to you...

Thanks for your time..

Andy

Chick on Thu September 27, 2007 5:40 PM User is offlineView users profile

Posted for Snowbear:













If that is the condenser, then those are not oil lines, however, you may have to peel off some of the sheet metal to get a good look. The oil.trans lines will go into the radiator, and cooler if equiped, but as I said, if that is the consenser, there doesn't appear to be any barrier to keep the fluid from mixing with the refrigerant, so that is not possible.. Follow the lines closely and see where they go..(from the condenser) you may have a condenser mouted in between..Maybe someone else can make heads or tails of this...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Chick on Thu September 27, 2007 5:42 PM User is offlineView users profile

Also, you do know that the condenser is always in front of the radiator, not in the engine bay..Weird set up in the pics if the radiator is blocked by an oil cooler...

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Chick
Email: Chick

---------------------------------------------

Freedoms just another word for nothing left to lose

snowbear on Thu September 27, 2007 6:18 PM User is offline


That is the condenser and it's in front of the radiator, it takes up the whole radiator, I never seen
a condenser that big, it's as big as the radiator thats why I thought it was a split system and the
lines are oil cooler lines as they come from the oil filter block...I had a friend come over and look and
he said the same thing that the lines were oil cooler lines and they go to the bottom of the condenser.

The pictures show the lines going into the condenser as you can see, I'll pull off some things so I can
get a better look at it but I don't think it will make a difference. this condenser is close to the radiator
and there is no other cooler that looks like this one, as you can see the high side is going into the top
of the condenser and the accumulator is on the other side of the condenser.....I don't know how this
system is set up....Anyway the question is where is the expansion valve.....?????LOL

Chick on Thu September 27, 2007 6:39 PM User is offlineView users profile

Ahh, the original question... The expansion valve is attached to the evaporator, in one of the two configurations I showed before.. If it's the type with the sensing bulb, I'm sure they made possible an access to get at it, the block type would be on the firewall, or even on the evap, but both will have the little "saucer" attached.. Here is a pic of an accord expansion valve and it shows how this type is attatched..With your truck, I really haven't a clue.. You may need to bring it to a shop for them to locate it for you if you can't gain access to the evap..Hard to do it from here...
Honda Accord expansion valve. easily accessed with the box removed..


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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

snowbear on Thu September 27, 2007 8:13 PM User is offline


LOL...There is no access to this evap, the only way to get at it would be to cut it open as they have
screws all around the evap and you can't get in there to get them out. When they built the Motor
Home everything was done and they put the front cap on last without giving any access to the evap..
or anything on the left or right side. I think I'll just put in a new compressor as everything worked fine,
it started to make noise and I lost the seal I shut it down and thats where I'm at now, I'll put in a new
dryer also. I think the compressor is the HT-6 whats in it now is a Delphi #6519 and OEM is 1136519.
According to the spec sheet it takes 8ozs of Pag-150 oil and 36ozs of freon when I open it up I'll blow
it out add the oil and vac it for 4hrs and see if it holds and if so I'll vac it again and then charge it and go
from there...What do you think Chick...Yes or No or use the roof A/Cs..... and say the hell with it....

Thanks for all your help and have a great day....")

Andy

Chick on Thu September 27, 2007 8:28 PM User is offlineView users profile

Those numbers cross to AcDelco #15-20151 which is an "HT6". If you can't find the expansion valve, then you really hasve no choice. leaking HT6's are common and usually don't need anything else replaced, so I would go for it.. If you didn't already buy your compressor, check out the Sanden and Seltec clones.. They don't leak like the HT6's do... Tim has them, just e-mail him for prices..

Be sure a good vacuum is pulled and the system amount of R134a is charged into the vacuum..Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

snowbear on Fri September 28, 2007 3:33 PM User is offline


HI All,

This A/c is driving me nuts with this condenser and all these tubes coming out of it...
FYI.. Two of us went under the motor home and traced the lines from the condenser... from the
bottom of the condenser two lines go to the oil filter block, from the top of the condenser one
line goes to the compressor and the other comes out of the compressor to the evap...out of the
evap to the dryer than out of the dryer to the condenser. This condenser must be a split system
to allow it to work like that...( don't know ) I'm going to put this problem to bed..enough is enough..

Want to thank everybody for your help, this is one great forum....Thank you and have a nice day...

Andy

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