New AC not working

[65BLKonBLK]

I have a'65 mustang that had original ac unit. I converted it to a new Sanden unit. Everything was replaced except for the under dash unit. My problem is the ac will not get cold unless I tap on the expansion valve, which has been replaced twice this week. Any other ideas.

Greg

 

[Ronbo]

Where are you getting the expansion valves from? I couldn't find any locally. The ones that were shown weren't even close to the original one. Also, do you have it wrapped up good with the supplied tape? Make sure the bulb is clamped down nica and tight too. Thats about all I have to offer, sorry. I just did the same thing you did in my 68. Everything is new except the expansion valve.


Ron

 

[65BLKonBLK]

I got the valves from Mustang Mania here in the Houston area. 1-888-302-3703 or go to their web site. www.mustangmania.com
I did finally wrap it on Saturyday and work for little while. My daughter drove the car from work Saturday evening and she had no ac again. I unwrapped Sunday morning to tap on the valve to get it to work again. I hour later daughter goes to work and she has no ac again.

 

[65BLKonBLK]

Also when you do a new ac swap I was told we needed to change the valve, I guess to accept the 134 Freon. Is this true?

 

[60s Refugee]

Just where is this expansion valve? I got a roll of tape with my kit and they never show'd where to use it. My AC works great, but it leaks water out on the floor, even though the drain hose is clean and properly installed.

Harry

 

[peeeot]

I just had the same floor overflow problem yesterday with an all-original A/C unit. I actually didn't mind; the splash of cold water on my bare feet felt nice in the heat

 

[LaGrasta]

Also when you do a new ac swap I was told we needed to change the valve, I guess to accept the 134 Freon. Is this true?

I don't believe it is. Originally I thought the dryer, all o-rings and ideally any rubber hoses needed replaced to convert to R134. I recently had my 1990 Taurus done and he did none of that, even after I mentioned it. My Dad had his 1978 Chevy van converted with no changes other than freon.

If the valve works when tapped, that has got to be the problem. Valve or orfice, those are almost always where blockage occurs.

 

[Ronbo]

Dont confuse the orfice tube with the expansion valve. An orfice tube should be replaced every time you crack the system open. Cheap insurance! 8) If your expansion valve keeps plugging up you must have some sort of contaminate in the system? You didn't add oil when you initially charged it did you? My instructions (Classic Auto Air) said it was pre-charged and not to add.

As far as the tape, you want to wrap up the expansion valve and the bulb and the tube connecting the bulb to the valve. The temp on one side dictates how much refrigerant flows into the evaporator on the other. I guess to keep it from freezing up?

Ron

 

[65BLKonBLK]

[

As far as the tape, you want to wrap up the expansion valve and the bulb and the tube connecting the bulb to the valve. The temp on one side dictates how much refrigerant flows into the evaporator on the other. I guess to keep it from freezing up?

Ron[/quote]

Thanks Ron. I'm going to wrap everything this time. Is the connecting tube your talking about the line with the thermostat sensor on the end?

Is ok to wrap everything from the valve to the actual connecting ac lines. I'm talking maybe at the most 5" back.

 

[Ronbo]

With the amount of tape they provided me I was barely able to cover the whole expansion valve assembly. If you have enough, I would cover all the exposed metal in the area. I guess the idea is to trap the heat/cool so the bulb can get a good reading. The connecting tube I'm refferring to is in fact between the sensor and the expansion valve. Weird how youve replaced it twice and its still doing the same thing though. Do you have a clamp around the sensing bulb and the line holding them tight together?

 

[65BLKonBLK]

I don't know that much about this things , someone else is doing the work for me.

If tape came with the new unit then the guy who installed it in Dec. kept it. Mainly we were in the dead of winter here and didn't need the ac. It actually got down in the 40s this year in Houston. I bought a roll of tape from the auto parts. 12 ' for 23 bucks. I have about 10' left over now.

I wrapped everything yesterday. The daughter took it to work and she said she had ac all the way. Hopefully the problem was that I had exposed metal therefore it wasn't getting a good reading like you said. Humidity may have been a factor also.

Thanks for all your help,
Greg

 

[60s Refugee]

Where is the expansion valve? When I look at my system I see the condensor, which connects to a black cylinder, which connects to a silver metal tube covered with clear plastic tube, then the pressure on/off switch, then a rubber hose going into the dash unit, then another fatter rubber hose running from the dash unit to the compressor, then rubber hose connecting the compresser to the condenser. I have the tape, but the instructions did not say where to use it. A reply on another thread said to wrap the metal connections between the hoses where they go into the dash unit. He said this is where they get frosted and melt and drip. Is this the expansion stuff you guys are talking about?

Harry

 

[66 Fastback]

The expansion valve will be on the under dash evaporator where the high pressure line comes into the passanger compartment. Here is a picture of the valve.

http://www.dallasmustang.com/page/produ ... product=11

Doug

 

[60s Refugee]

I recognize that! So, you wrap that whole assembly with that tar tape. I'll do that! Thanks,

Harry