Intermittent A/C

pontiac
lemans

#1

My mum just had her Crank Sensor and Ignition Module replaced ('98 Pontiac LeMans w/ 55K miles) because the car was dieing suddenly. That may have fixed the dieing problem but since she got it back the A/C doesn’t come on for a varying period and then goes on and off. This applies to the fan as well as the compressor so it seems to me it is an electrical or electronic issue. I guess she should take it back to the guys who did the work but I was hoping maybe someone had experienced this before.



Thanks,

tenthumbs




#2

You need to get the pressures checked. In 11 years, enough refrigerant may have leaked out causing pressures below the threshold of the low-side cutoff switch. This would cause the turning on and off.


#3

Low pressure wouldn’t turn the cabin fan off. The OP is right. It is an electrical problem.


#4

The pressures were tested in '04 and coolant checked/added. When it is working it blows good cold air so that is why I think it is electrical. I’m thinking this might be something to take to the dealer rather than the independent she has been going to.