q a/c running up to par?

[qship96]

tested a/c today - 93 degrees and about 70-80% humidity outside- center vent wouldnt go below 60 degrees when unit manually put on full fan speed/recirc. after 20 min. of 60-75 mph highway driving in full sun

interesting,our miata in same conditions showed vent temp drop to 40,then compressor cycled off till temp creeped to 46-47,then compressor back on till temp dropped to 40--over and overthe miata is also r134a equipped and has never been serviced{1999 with 91K} q was serviced last july.

[Q45tech]

44-47F is the usual situation on a functioning 90-96Q.If you manually reduce fan speed to low expect the temperature to creep down by 5F..........39F.

[FarFetched]

You can check discharge and suction sides of evaporator for temprature difference. If ther is considerable difference, you have a blockage somwhere in the system. Q is a txv system, besides all that climate controll equipment, it a basic system. Are you sure "they" serviced it correctly?Rule of thumb, the hotter it gets the more efficient a/c should be. It is all based on heat exchange. Cheers!

[elwesso]

buy yourself a nice manifold gauge set, and you can sorta tweak the pressures a tiny bit.....

May be worth replacing drier and cleaning the evap and condensor, youre crafty enough to do it DIY.

[qsiguy]

Definitely buy an A/C manifold set. It is well worth the money if you every plan to work on your A/C. If you just have the cheapo low pressure filler gadget, even with a gauge, you just have no idea what's going on with your system. Should expect to spend about $70-100 for a decent one. I got mine at Autozone for $79 and it's got the little sightglass in the center so you can see what's flowing through it.

I just repaired mine myself, replace compressor, dryer and flush the system, and I'm getting exacly the center temps that Tech mentioned but I am at ambient of 105-115 degrees! At 60 degrees at 90 ambient you are not even close to "par" hehe. I'd call that a double bogey!

[elwesso]

What did you use to flush your system?

[qsiguy]

It was at Autozone, think it was called "Clean and Flush" in a plastic white bottle with green lettering (same type of bottle motor oil comes in). Clear oily stuff. Says it's compatible with the R134a/PAG oil so if there is any left in the system it's not a problem.