DAmn, with this many people having the SAME problem, MNA better do something..... My AC Amplifier is backordered until JUly. I'm going to raise complete HELL when/if the problem happens again.....grrrr

 

Dear former_s2k'r,

Let's not all shoot the messenger(service people) but fire many shots over the head of MNA and let them know if MNA wants to retain customers they better get their act together.

I definitely agree with you-if problem is not solved after waiting months for parts-we should all come down hard on MNA.

Bob

 

I live in the SE U.S. today it was 94F degrees with 97% humidity. I have an all black interior and you bet its hot when I open the door after work, however when I get in I open the sun roof, roll down the windows, turn the AC on full take off and 1/2 mile down the road and the AC was nice and cool. Im thinking about getting the sun shade it should help.

 

I asked the Dealership (128 Mazda) to confirm the A/C was working properly while the 8 was in for an Oil Change.

The dealer said that there was a 30 degree differential between ambient and vent temp. They claim that's acceptable.

I still think it takes too long to cool down such a small car.

 

NEWireless

The dealership I bought my car from claimed the same thing. They also claimed that there wasn't any reason to get my PCM calibration updated. In other words, the dealership I bought the car from has a bunch of lazy bastards working in their service center.

I now take my car to another dealership. Their service center upgraded my PCM and told me that it was actually several revisions out of date. Rather then tell me that the A/C was "within acceptable range" like the first dealership, they promptly ordered me a replacement part.

If your dealership isn't giving you the service you expect, go elsewhere.

On a side note, the Thermistor I was referring to earlier is apparently part of the A/C amplifier. Looks like I'm getting the same TSB as the rest of you after all. It doesn't look like there is a clear answer as to whether or not it really helps, but I'm certainly not going to tell them not to do it.

 

Had mine in today and they claimed all was within specs. However, when I got home I checked the numbers from the service invoice against the workshop manual. The high-pressure reading was in the normal range, however the low-pressure side reading was 35 psi. The acceptable range at 75 degrees ambient temperature is between 12 and 20 psi, so it really is quite far out of spec or my manual is incorrect or some mistyping on the invoice.

An admittedly quick and not-necessarily-educated trip through the troubleshooting section landed me at either improper positioning of the expansion-valve "heat-sensing tube", or faulty expansion-valve.

So I will take it up again with our service guys and see how it pans out.

 

The Thermister is a temperature sensing probe which is plugged into the A/C amplifier. It is used to measure the the temperature of the evaporator coil to prevent it from getting too cold and freezing up. If the resistence values for the thermistor are out of spec, the compressor clutch could cycle prematurely. Good luck on your fix.