When driving around town in my 2005 X-Type wagon, my A/C blows cold in warmer weather (let's say 75 and above). If I put the car in neutral at a traffic light and rev the engine to between 2k and 4k, the cold air quickly comes online. But, if I continue in traffic, with RPM 1-2k, then the warm air is back after a few minutes.

Driving on the freeway, a/c is no problem.

Is this as simple as a low charge or something more involved?

 

I am having this same issue.

 

I did more searching on the site and came upon this thread which mentions a TSB for compressor regulator valve.

 

After researching, I found that in my case it cannot be the compressor regulator valve b/c when the dealer replaced the compressor back in 2009, the part they put in does not have the valve there.

i was wondering if it was worth getting one of those cans of r134a at the parts store, the kind with a low side pressure gauge and see if perhaps i am low on pressure? i am unclear which port is the low side (see attached photo). my theory is that it is the port on the right since that seems to go to the larger of the two lines (the one against the firewall). this is the 3.0L engine.

 

The low side of any AC compressor is the pipe that feels the coolest of the two when running.

 

The one nearest the bulkhead is the coolest of the two. That'll be the one you need.

 

thanks!

 

Update. I attached to the port on the right (in the above post's picture) and took a pressure reading. It was low. I pumped in a bit over 1/2 can of A/C Pro All in One Solution (20 oz can) and the pressure reading came up to spec. Weather isn't too warm today, but it "seems" colder now. True test will be 80+ degree weather. Supposedly this product has a built in sealer that should work for minor leaks. Fingers crossed that she'll stay cool this summer!