Having a problem with the A/C. Blows cold at idle and lower rpm's.
Seems to not blow as cold at highway speeds and higher rpm's.
What could be the problem?

 

I think someone had that before and they had to add freon.

 

Thought about that, but wanted to rule out A/C belt slipping, blower
motor cycling off, or computer shutting off the compressor.

 

Usually if your just low on freon the system will not blow cool at idle, but once you get the car up to speed it will cool down. You could have a sticking expansion valve or a plugged drain that is allowing the unit to ice up. Freon is the easiest and least expensive way to go but don't be shocked if it doesn't completely fix your issue.

 

Thanks for the info. Hadn't noticed if the A/C was draining. I'll
check it out. How could the expansion valve cause the problem.
If it's stuck closed wouldn't it be the same temp at all speeds? I
know this is a strange problem. Seems like most have the opposite
problem.

 

Update on problem. Upon further investigation, my passenger side
vents are cold and my driver side are not so cold. I have a drip
when the A/C is on so no problem there.

 

ok... this may be a stupid question but i have to ask cause.... well i have seen it before. your dual temps are set the same right?????

i'll let you know what i find out about mine when my tech looks at it next week

 

Just talked to a friend who bought a 2001 vert and he had the same problem, except it would blow on the bottom but not on the top.

He had a mechanic look at it and he had corroded vaccum line, caused by a battery leak

Peace
Willfulone

 

If there is a difference in temp between the passenger and driver side the problem is not with the cooling system it is most likely an actuator. (assuming the dual climate controls are all set correctly) I had the passenger side go out last year and it blew heat regardless of what the settings were. Check the codes. Actuators will normaly set off codes. It could also be that one of the a/c doors/dampers is not moving all the way. Either way both are a pain to get to. I took my in to have the repair done. Also could be vacuum leak. Remember the battery sits right on top of all of that and a little leak can cause a lot of problems.

 

Love your avatar Bro!!!!!!

 

If that is the problem, here's how I fixed mine... Zuti






I've had an issue with my a/c since I bought it in '03. It's a '98 coupe with dual zone a/c. The airflow was weak at best and there was no change in air flow direction when changing modes. Having read a number of threads on this problem, I felt that the problem was probably the vacuum line at the rear of the manifold. A few weeks back, my oil sending unit went south, so with the help of friend and local forum member Andy Moon, we replaced the oil sending unit (Thanks again Andy), and at that time verified that the vacuum line was in place, which it was. So after review of a few more threads, I decided to remove the battery to see if there was a damaged vacuum line due to battery leakage. After removing the battery and tray (about 5-10 min), I discovered that there probably had been some battery leakage damage much earlier that had been repaired, as there were signs of minor corrosion on a small porton of the battery tray mounting frame and frame rails. I cleaned and repainted these. I then searched for the vacuum lines that are routed with the harnesses below the battery tray. I found one that had either been damaged by acid or worn from rubbing on another component.
The line was worn through, but not severed. I cut the line and slipped each end of the severed line (they are very small plastic lines) into about a 4" length of 1/8" vacuum line, to splice the line back together. I then checked reamining lines for damage and found none.
I buttoned everything back up, fired up the a/c and low and behold, nice cold air with great volume and working modes.
It was a simple and cheap fix. I've included a couple of pics of the damaged line. I forgot to get one of the vacuum line repair, as I had it buttoned up before I remembered to take that one... sorry my bad... but I hope these pics help those of you with this problem.

 

did you ever hear of a/c gauges? eg; low side,high side?

 

Thanks guys for all the info. I will check the vacuum lines under
the battery and check the pressures and codes and go from there.

 

My dual temps are set the same. If I move the temps to hot, the
heater comes on and it gets hot. If I move both to cold, the passenger
side gets cold but the driver side is only cool.

 

Thanks for the info Zuti.