question for the A/C gurus

[turbo2771]

'87 Grand National A/C blows air but it's not cool.
I checked the freon low pressure and it is about 36 psi.
I jumped the cycle switch and the compressor clutch kicks in
but still no cold air.
Also not sure if it's related but the max speed on the blower does
not work.
Thanks for any help you can give me.

[kenmosher]

Not a guru ... and don't even play one on TV

However, most automotive systems need at least 40 psi on the low side to trigger the compressor (from memory). I'm betting the system is just low.

[Keller]

Originally Posted by turbo2771

Also not sure if it's related but the max speed on the blower does not work.

This could be the in-dash blower speed switch, or is often the resistor unit up near the blower motor under the hood. Sometimes they get fried from overheating. Can get the resistor unit in the aftermarket and it fits many cars.

[turbo2771]

Thanks guys. That's some good info.

[PaCemkr86]

when you get the fan speed to work on high, let me know what the low and high pressures are on your a/c gauges