Help needed troubleshooting air conditioning

[StayGold808]

Hi All,

I've trying to diagnose my air con woes. Evaporator blower works fine on all speed settings. But:
1. Compressor does not engage
2. Front condenser blower does not work

There is no voltage at the compressor, nor the front blower.

I've just replaced the relay next to the evaporator to no success.

Can someone please help me with what needs to be checked next?

Thanks,
Adam

[86 911 Targa]

Originally Posted by StayGold808

Hi All,

I've trying to diagnose my air con woes. Evaporator blower works fine on all speed settings. But:
1. Compressor does not engage
2. Front condenser blower does not work

There is no voltage at the compressor, nor the front blower.

I've just replaced the relay next to the evaporator to no success.

Can someone please help me with what needs to be checked next?

Thanks,
Adam

Adam,

Fuse #2 tends to run hot.

Fuse #2 (check for corroded fuse or poor contact).

Also, voltage on both sides of the fuse.

You may pm me as needed.

Good luck,

Gerry

[Hugh R]

Don't know your car, but does it have a Hi-Lo pressure switch for the freon? You might be low on freon.

[86 911 Targa]

Here's another thought.

Check the relay located in the smuggler's box. (see pic).

If you need to replace, buy this one.



Which provides power to the condenser relay.



Gerry

[tcar]

Originally Posted by Hugh R

Don't know your car, but does it have a Hi-Lo pressure switch for the freon? You might be low on freon.

They did by '86. The older ones w/ the York compressor did not.

Nothing; no power when you jump the compresser?

[StayGold808]

Thanks for all the replies...

Found the problem. It was the thermostat in the centre console. When I jumpered the connections to bypass the thermostat, everything worked fine.

However, I noticed that the voltage to the front condenser blower is only 7 volts. Is this normal? Also, where is the front condenser blower relay?

Thanks,
Adam

[86 911 Targa]

Originally Posted by StayGold808

Thanks for all the replies...

Found the problem. It was the thermostat in the centre console. When I jumpered the connections to bypass the thermostat, everything worked fine.

However, I noticed that the voltage to the front condenser blower is only 7 volts. Is this normal? Also, where is the front condenser blower relay?

Thanks,
Adam

Adam,

The voltage should be 12-13V

Here is your relay/fuse location.

Good luck,

Gerry