Ok, now its not working.

[strokerpost]

So I had my A/C fixed a while back, or so I thought. I replaced the comp, the dryer and expansion valve, and swapped the seals out for the R134a. I only drove it down the street taking the guys word that it was good, and I parked it. So the other day I go to take a short drive and its got nothing, no cold at all. I call the guy and tell him what I got, he says bring it back, which I did, and after 2 days and another expansion valve and some "bear crap" to insulate it he discovers that only one line through the fire wall is cold, REAL cold, the other is not. He said there must be a restriction in there. I cant even say the name of the part now, duh. Lol Anyway, anyone ever have this or know whats up with this? The system has been closed the whole time I've owned it, it just had a bad comp. Is there a valve in there somewhere that it at fault or is this a plugged up...um...still cant say the name dammit, you know that little radiator looking thing that looks like a heater core. Lol. In the pic the small line with the new expansion valve is the cold one.

 

[1978 NYB]

Evaporator............

I would get a FSM for your car if you don't have one already. It's a great tool to learn a lot about your car and how things work.

 

[commando1]

Probably just about the hardest repair in an A/C system there is. There will be lots of new words you'll be saying.

 

[1978 NYB]

I took an evaporator out of 1986 Camaro this past weekend in 20 minutes. Ridiculously easy on GM's! The system was empty, disconnected two lines, took off the receiver/drier, a couple of screws, and it just about fell out. All from the engine compartment side.

 

[commando1]

I never understood Chrysler.
GM? Easy. For years! If they can do it....

 

[strokerpost]

Evaporator............

I would get a FSM for your car if you don't have one already. It's a great tool to learn a lot about your car and how things work.

Whats an FSM?

 

[1978 NYB]

Whats an FSM?

Factory Service Manual.

They have a lot detailed info and illustrations of the A/C system and how it works.

The FSM covers the car for the most part bumper to bumper.

I always get the FSM and the Parts Book for all of my cars. Sure makes life a lot easier.

They can can be bought reasonably on EBay and other sites.

 

[strokerpost]

Factory Service Manual.

They have a lot detailed info and illustrations of the A/C system and how it works.

The FSM covers the car for the most part bumper to bumper.

I always get the FSM and the Parts Book for all of my cars. Sure makes life a lot easier.

They can can be bought reasonably on EBay and other sites.

Thanks. Well, I someone else told me that one hot and one cold is right, but according to him, the LARGER line should be cold and the SMALL line hot....which is opposite of what I have. Not sure how that can be since the lines can only go on one way and the compressor can only turn in one direction??? $%@#$ I hate this kinda $^$@#$&!!!!!!!!!!!!!!!!!

 

[commando1]

? $%@#$ I hate this kinda $^$@#$&!!!!!!!!!!!!!!!!!

My exact words all through my Thermodynamics courses in college.

< Sent from my tablet >

 

[strokerpost]

Well I talked to the tech that was working on it to find out what the high and low side pressures were, he said the high side was about 150 and the low side was about 60. He said the high side should be in the 200-250ish range and that's why he thinks there is a blockage. Does this sound right to anyone here?

 

[jake]

If there is a blockage in the evap, you would think your high side, leaving the compressor would be 200psi plus, and you would almost go into a vacuum on the low side.

 

[strokerpost]

If there is a blockage in the evap, you would think your high side, leaving the compressor would be 200psi plus, and you would almost go into a vacuum on the low side.

I misquoted the guy that's been working on it, he said what you are saying, and another local tech I spoke with also agreed that IF there was a blockage the peruse on high side would be excessive and a vacuum on the low side. Oh yes, my guy that I have been using also said he checked out the blend door and made sure all the "visible" and checkable vac lines were in proper order and all seemed ok there, so guys, whats left? New comp, new dryer, new expan valve, no blockage, what else might cause low pressure readings and no cold air? Thanks for any ideas.

 

[72Fury]

My exact words all through my Thermodynamics courses in college.

< Sent from my tablet >

Mine as well. I took that class once. I still have flashbacks of what's the first law, second law, adiabatic............

 

[commando1]

Mine as well. I took that class once. I still have flashbacks of what's the first law, second law, adiabatic............

The first words of the Professor on the first day of first Semester Thermodynamics.
"Only God can create or destroy energy. He did it on Day One and hasn't changed the amount of energy there is ever since".
Almost 45 years later, I still remember that opening line. LOL.

 

[Stormer]

The first words of the Professor on the first day of first Semester Thermodynamics.
"Only God can create or destroy energy. He did it on Day One and hasn't changed the amount of energy there is ever since".
Almost 45 years later, I still remember that opening line. LOL.

He should have been fired right on the spot.

 

[commando1]

He was over dramatizing to make a point, not preaching. He was explaining how we would come to learn that semester the number 1 rule in balancing equations in all of Thermodynamics is The Conservation of Energy. It worked even with the agnostics....
Calm down, Ross.

 

[72Fury]

He was over dramatizing to make a point, not preaching. He was explaining how we would come to learn that semester the number 1 rule in balancing equations in all of Thermodynamics is The Conservation of Energy. It worked even with the agnostics....
Calm down, Ross.

It's one of those classes that sticks with you. I still have my book somewhere from that class. I'll have to look.

 

[65sporty]

low side should be about 30, high side is ok at 150. I dont believe there is a blockage, with low side at 60 it wont cool, you may want to find another a/c tech