Just picked up my very own jeep w00t! its a 98 and i've been busy fixing various problems (anyone in northeast ohio have a nss for sale?) including the AC. I'm quite handy in all sorts of this stuff including using a meter and this is where i'm at currently:
A put a gauge on the pressure port closest to the canister (i know its not an drier but i cant remember the name of the canister in the orifice system) and got 45 PSI which to me means I'm well within spec for pressure.
With the engine running, turn on the AC and the engine idles up slightly as if to prepare for the compressor. The clutch never engages. If i meter the line to the clutch it never gets voltage. The fuse in the engine bay is fine (large 20 amp fuse). If I pull the relay the connection that would normall engage the clutch has voltage but the relay never clicks over. If i meter the voltage to the relay coil it never gets voltage (not only that but i tried a known good relay). ALSO, i have jumped the low-side switch (closest to compressor) and i get the exact same response from the engine as if i just turned it on at the control panel so the switch checks out.
This seems obvious to me that its a switch or broken connection (another fuse somewhere that flips on the relay?) somewhere but I have no FSM or previous experience with the electrical system of this vehicle.
Suggestions on what to check next? thanks!
A put a gauge on the pressure port closest to the canister (i know its not an drier but i cant remember the name of the canister in the orifice system) and got 45 PSI which to me means I'm well within spec for pressure.
With the engine running, turn on the AC and the engine idles up slightly as if to prepare for the compressor. The clutch never engages. If i meter the line to the clutch it never gets voltage. The fuse in the engine bay is fine (large 20 amp fuse). If I pull the relay the connection that would normall engage the clutch has voltage but the relay never clicks over. If i meter the voltage to the relay coil it never gets voltage (not only that but i tried a known good relay). ALSO, i have jumped the low-side switch (closest to compressor) and i get the exact same response from the engine as if i just turned it on at the control panel so the switch checks out.
This seems obvious to me that its a switch or broken connection (another fuse somewhere that flips on the relay?) somewhere but I have no FSM or previous experience with the electrical system of this vehicle.
Suggestions on what to check next? thanks!