ac not working

nismocrew05 said:

hey guy i have a 2005 frontier and the ac just stopped working i test the lines and they are good holding pressure i was reading about Thermal control amplifier (ac issue) but it was on older truck does anyone know if its the same on the 05 modles

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Did you check the fuses, relay? You said the lines are holding pressure, did you check the pressures with a manifold gauge? Do you have enough pressure to close the low pressure switch to power the clutch coil?

nismocrew05 said:

i check all the fuses and used the can witht he gauge on it to check the pressure in the line

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You need to figure out if the problem is pressure related or electrical. If you have a test light or a VOM, see if you have power going to the low pressure switch and across the low pressure switch. Check the high pressure switch too. Then see if you have power going to the clutch coil. Check the ground also. Make sure all your electrical connecting plugs are clean and tight. You really need a set of manifold gauges. You need to make sure there is enough system pressure to operate the A/C. The gauge you used to check pressure with will only show low side pressure, and not accurately at that. You need to check the high side too. When the system is off, the pressures should be equalized. If your high side pressure is too low, and low side,(leak) then your total system pressure will not allow your pressure switch contacts to close and power your clutch coil.