When outside temp. gets above 70 degrees, car will quit running

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The low side reading will usually correspond with the dash temp,45 lbs at low side should equal 45 degrees f at the dash with a medium fan speed and 70 to 80 degrees f outside temp with a good air flow through the condenser.(fan placed in front of vehicle).

Hard to say.
Under normal conditions, vent temp should be about 20 or 25 degrees less than outside air temp.
So if outside air temp is 90 degrees and the engine is at idle speed, vent temp would be around 65 or 70. On the road the vent temp could be less than 60 degrees.
If outside air temp is 70 degrees vent temp will be around 40 - 50.

I have a 2000 pontiac grand prix with a digital climate control system. The heat quit working, it doesn't blow out any heat. Now that it is warm outside the air stopped blowing out any air. The digital temperature on the climate control is not correct. When it states that it is below 30 degrees on the ext and it is warm outside the air wont be cold. Once it starts going above 30 degrees the air gets colder. Today the blower stop working all together. Was told it maybe the climate control unit was bad. You can hear the door opening/shutting when you switch the temp from cold to hot. But there was no heat blowing out whatsoever in the winter time. Could you please give me your opinion on whether or not it is the climate control unit or something else?

call a buick dealer and ask the parts dept...gl

Sounds like a loose connection -38 is probably the open circuit position. Not sure where the sensor would be though.

dear friend-you are correct when you say it can be a tempreture switch that might be at fault.your air con take a lot of torque away from your engine when kicking in so you need something to compensate and restore the torque.a sensor is added into the system to do exacly that and works of a signal coming from the temp switch.that unit is normally mounted on the fire wall.

heat build up causing spark system to break down

tell tale sign is highway drive is fine (plenty of cool air under hood)

you may have spark module prelim failure
it'll only get worse eventually it won't run but a few minutes

Your truck does not have to be low on water to be running hot...you need to verify the tempature of the cooling system, and the head temp...then you will be albe to tell if it is actually overheating , or just an indication problem. Be very careful as hot engine coolant can scald you badly (know from experience)

Prior to charging the system, did you vacum it down? If you did not when there becomes a load on it the low pressure switch will kick the compressor off to avoid damage to the compressor.