06-14-2017, 02:46 PM
Last fall I replaced the a/c coolant temp switch to fix the continuous running of the condenser fan and failure of the compressor clutch to engage. The fix worked great and gave more insight into the operation of the a/c. However the same symptoms have started again this summer. I assumed the coolant temperature switch, shown in documentation normally closed to ground, would show zero on the ohm meter measuring it out of the circuit. I grounded the lead from the A/C AMP to the coolant temperature switch and the system worked fine, so I replaced the switch again and reconnected the A/C AMP wire. The symptoms returned. I measured the old switch, DC ohms, at 120, and both of the new ones I bought at 700 ohms. None of these three will make the symptoms quit.
1. Are the switches supposed to read zero on an ohm meter?
2. Does the A/C AMP have a threshold for that lead?
3. Is there another possible issue that would cause these symptoms that I am overlooking?
I appreciate any help on this and I appologize if this issue is covered in another thread somewhere else in the forum, I search in earnest for it.
1. Are the switches supposed to read zero on an ohm meter?
2. Does the A/C AMP have a threshold for that lead?
3. Is there another possible issue that would cause these symptoms that I am overlooking?
I appreciate any help on this and I appologize if this issue is covered in another thread somewhere else in the forum, I search in earnest for it.