sleeper A/C

[Aubie2]

I have a 1998 Century. The A/C in the front works great but the sleeper unit only blows hot air. Any suggestions? Thanks in advance.

[Big_Dave]

I presume that the a/c system on a Century is all-in-one for the cab & sleeper.

If that's the case, check the expansion valve for the sleeper a/c.

My Pete was doing the same thing.

[lonewolf]

it could also be low on freon,once it gets low on freon,for some reason,it won't supply cold air to the sleeper,i had the same thing happen to me in a classic xl

[Capt._Chaos]

The Freightliners, like most other trucks with sleepers, use dual evaporators- one for the cab, and one for the sleeper.

The one in the sleeper has a solenoid valve that blocks freon flow through it when the rear fan is turned off. The solenoid is supposed to open when the rear A/C is switched on. If you switch that unit on and there's electrical current (both power and ground) present at the solenoid valve, then the solenoid valve itself is bad. If no current there, then there's an electrical problem somewhere.

Might also be a bad temperature control over on the control panel. Good luck!

[lonewolf]

but capt,every freightliner i have been in,once you turn the a/c on in the cab,it automatically comes on in the sleeper,you have to get up close to the vent to feel it,due to the fact the fan is on low,but it comes on none the less