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Greg, import technician
Category: Nissan
Satisfied Customers: 7122
Experience:  import Technician . Shop Owner ,. 27 years experience,
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1995 nisson truck. ac works intermenttely. replaced ac

Customer Question

1995 nisson truck. ac works intermenttely. replaced ac relay. didn't help. does it go through the ecm?
Submitted: 1 year ago.
Category: Nissan
Expert:  Greg replied 1 year ago.

Did you check the Freon charge.

If the charge is too low this will happen will start to switch itself on and off .

You need to check the charge of the low side and high side .on a correctly filled system you will have 35 - 40 psi

on the low and 180 - 200 psi on the high .

If pressure is good replace the pressure sensor switch .

This system does not run though the ECM. unless you have the automatic A/C system.

Need readings of the high and low

Please check then get back to me if needed be happy to continue if needed.

Customer: replied 1 year ago.
Not auto ac. Freon chArge is Good
Customer: replied 1 year ago.
Could be temp sensor in evaporator?
Expert:  Greg replied 1 year ago.

This is possible that the temp sensor is bad, but i would first put a jump wire just to test on the pressure sensors to see if the compressor stops cycling on and off .

If it does replace the pressure sensors its much more common than the temp sensor .

Rgds Greg