Choppers

iTrader: (60)

Not an LS1 but my dad has a 87 Toyota. We vacuumed the ac out. Well now we can't get the compressor to turn on. How do you jump start one?

Slo-Mo-Shun

iTrader: (2)

The low pressure switch is probably the problem.... the safest way is to start injecting freon into the system, the a/c compressor is going to switch on and off frequently but it will eventually come around, and work properly.

The other way is to install a jumper wire across the lower pressure switch and it will activate the compressor.

Choppers

iTrader: (60)

i tried putting cans in but the compressor wouldn't budge

Choppers

iTrader: (60)

when you say jumper wire what do you mean?

Slo-Mo-Shun

iTrader: (2)

Are you sure the a/c compressor clutch is good? Unplug the low pressure switch and take a single wire and go from one of the pins to the low pressure switch to the other. Making a complete circuit between the two pins.

Choppers

iTrader: (60)

we changed the clutch but nothing is happening

Choppers

iTrader: (60)

we ran a wire from the battery to the positive on the compressor and nothing happend

Slo-Mo-Shun

iTrader: (2)

There is a clearance specification for the clutch. Also if the compressor clutch connector is 2 pin.. then it probably needs ground at the other pin to activate. If its a single pin connector. Make sure your grounded to the motor properly... ie... a painted a/c compressor may not ground properly.

Choppers

iTrader: (60)

its a single pin

Slo-Mo-Shun

iTrader: (2)

Try installing a jumper ground wire from the battery to the compressor housing. Then try applying power to the clutch wire and see what happens.