a/c problems

[redvnexec]

i have a 1988 vn commodore. When i turn on the a/c or heater it doesn't work on level 1 or 2 but only on 3 and 4 anyone know what might be the problem

[azzfox]

Fan speed resistor, or dodgy switch. Theres a how-to floating around here for the fan speed resistor.

[aussieghostrider]

the fuse box is a big square thing .. costs $50 and takes 5 mins to replace ...

you know when you pop the bonnet ... lok at where the window wipers go into ... its a big plastic cover ... well the fuse is under that ... becareful as with age these things will crack easy ... mechanic should fit it for free but worse case $60 all up u should pay and no more ..

[redvnexec]

ok cheers........

[Aussierepso7]

it is the fan resistor switch

[redvnexec]

and whats wrong with that. dont know much about all the a/c stuff

[Bz Kn33z]

Well the problem with the A/C is you dont need it, so wind down a window or 2, so take it all out and you dont need to worry about it then, also saves 20-30kgs and then get a smaller belt, thought the early 88models didnt come with A/C.

The fan resistor switch just die with age and is a very common thing mine is the same, and my old vn was the same aswell,

[pow3rslave]

^what they all said
fan speed resistor, it's under the scuttle panel which is the plasticy bit just in front of the windscreen (before the bonnet)
Replacing the Fan Speed Resistor

[COMMY VP 666]

so if the fan speed resistor fails air con will fail or just the fan wont work?

[peter65]

The fan speed resistor controls the speed of the fan which is set by the dash switch. From memory, the fan switch also provides the ecu with a control signal to switch on the a/c compressor solenoid. The new fan speed regulators (~$50) are electronic (so there are no fragile coils of wire to fall to pieces as in the old ones when they get old). The resistor (under the plastic "plenum" cover accessed via the engine bay) is a plug-in/screw on so its an easy repair. peter.

[redvnexec]

cheers pete