SierraAlphaMike
NAXJA Forum User
- Location
- La Mesa
I was in the process of replacing my mechanical fan with an electric fan and wiring a control switch into the cabin when I fried something controlling the A/C clutch and auxiliary electric fan.
Backstory: My intention was for the new electric fan to engage whenever the aux fan was engaged, or when I turned on a cabin switch. I had two lines attached to the relay signal of the new fan; one spliced directly from the relay signal of the aux fan and a second leading from a two-way, on/off switch in the cabin. The problem occurred as I was trying to wire the cabin switch. The signal from the aux relay was ON-0V and OFF-12V. The cabin switch was originally wired such that 12V-ON and OFF-0V, so I swapped the ground and signal leads, and probably shorted the system somewhere. Now, even with the switch and relay splice removed, the A/C clutch and aux fan will not engage.
I've troubleshot the following:
Swapped relays and fuses.
Unplugged/plugged in the Coolant Temperature Sensor.
Jumped the A/C clutch switch.
Nothing I tried got the A/C clutch or aux fan going again. Now, the signal lead from the relay shows 0V when the A/C is turned on in the cabin and 3-4V (instead of 12V) when the A/C is turned off. Also, as I set testing things with a multimeter, I noticed the engine is running a bit more rough and struggling a little bit at idle. I recently had the entire A/C system overhauled, including new clutch, compressor and coolant, and it had been working 4.0 for the past few weeks, so I doubt there were any slow-burning issues that just coincidentally manifested when I swapped those pins.
Any suggestions on where to look now? Thank you in advance!
Backstory: My intention was for the new electric fan to engage whenever the aux fan was engaged, or when I turned on a cabin switch. I had two lines attached to the relay signal of the new fan; one spliced directly from the relay signal of the aux fan and a second leading from a two-way, on/off switch in the cabin. The problem occurred as I was trying to wire the cabin switch. The signal from the aux relay was ON-0V and OFF-12V. The cabin switch was originally wired such that 12V-ON and OFF-0V, so I swapped the ground and signal leads, and probably shorted the system somewhere. Now, even with the switch and relay splice removed, the A/C clutch and aux fan will not engage.
I've troubleshot the following:
Swapped relays and fuses.
Unplugged/plugged in the Coolant Temperature Sensor.
Jumped the A/C clutch switch.
Nothing I tried got the A/C clutch or aux fan going again. Now, the signal lead from the relay shows 0V when the A/C is turned on in the cabin and 3-4V (instead of 12V) when the A/C is turned off. Also, as I set testing things with a multimeter, I noticed the engine is running a bit more rough and struggling a little bit at idle. I recently had the entire A/C system overhauled, including new clutch, compressor and coolant, and it had been working 4.0 for the past few weeks, so I doubt there were any slow-burning issues that just coincidentally manifested when I swapped those pins.
Any suggestions on where to look now? Thank you in advance!