Automotive Air Conditioning Information Forum

Hi guys,

Wondering if you could help me out please. Dual Ac Sequoia doesn't seem to cool very well - poor performance in hot weather. Compressor seems to run constantly, but that may be the high temps here in Texas?

When I had the timing belt done, the garage noticed the poor performance, 'checked' the systems and told me my compressor was 'on it's way out' and wanted $2700 to change the whole system. Needless to say I told them to stick to cars as their comedy act was terrible.
I had the system evac'd and put in 39 oz exactly, to make sure it wasn't the levels, but not a real improvement.

Pressures are: LOW 55 HIGH 260
Temp 86 degrees
Humidity was 68% at the time
Vacuum 45 mins, check no leaks for 20 mins

The car had been running at 1500 rpm for a couple of minutes. What do you think could be the problem? Thanks

Condensing problem. Condenser fans , air path blocked etc.

Were those pressures taken at 1500 rpm? Both cabin fans on highest speed? Doors open?

What year is this Toyota?

Also check to make sure no heated air or outside air is getting mixed in.

2003 Toyota. Pressures at idle
Condenser fan kicks on fine with good airflow
Fans high speed with doors open
Hot goes hot and switches back to cold when I turn the temp.

Thanks for the replies so far.

Post pressures at 1500 - 2000 rpm.

I don't think it's the compressor, which seems to be putting out sufficient pressure. In fact, both high-side and low-side pressures are elevated. The pressure on the low side, 55 PSI, corresponds to evaporator temps in the high 50's. So I can see why you aren't getting enough cooling.

In addition to the suggestions already mentioned, it could also be a partially stuck-open TXV.

What vent temps are you seeing?