AIR CONDITIONER My van is a 4.3 V6 which has front & rear air conditioner. The rear AC works finds. The front AC blows out cool air but the volume is really low even with the fan on high. Out of curiosity I turn the engine and all accesories off and then turned the key forward one notch. I turned on the rear fan and it works fine. I then turned on the front fan and it does not work although it works when I turn on the AC. Any ideas why I'm my air flow is so low in the front but not the rear. I thought it is all one big connected system. Thank you, Dana

there will be a cooling fan in front of the condenser ( ac unit in front of the radiator) that should be running as soon as you turn the ac on. If that is not working then the head pressures for the compressor become excessive and to save the compressor from damage it is shut of at the clutch at the pulley. When you are moving there is air flow through the condenser and so the head pressures are maintained at the correct level. Have it checked out by an accredited auto ac specialist . If you have a viscous fan hub on the engine fan the consider replacing it as it is not pulling air through the radiator when idling

clogged air condition filter leading to rear unit Possible LOW on FREON

The very first thing you need to do is to check for fuses or say faulty fuse. Secondly check fan which starts along with air conditioner, it might be manually switched off or the fan may have been clogged. Also reason can be lack of refrigerant - charge your air conditioner with refrigerant. Last thing you need to check is cooling coil - the cooling coil may freeze if there is no refrigerant in the system.

I recharge unit for your ac

hello l..... Begin by replacing the air conditioner relay. That should solve the weak fan volume. If the AC still is not as cold as it should be get the AC system charged [add more refrigerant]. The charging requires special tools so most folks leave that to the pros at the garage. Joe

This is a common problem on all Astro/Safari vans. The problem is a leak in the vaccum lines that control the vaccum switch responsible for changing air direction from the defrosters, dash vents, floor vents..etc.
Many of the problems that plaque the Astro/Sarfari vans and many other "Mini-Vans" is the build up of excess heat in the engine compartment. It\'s a tight place to put a V6-4.3 Vortec engine and the heat generated bounces back and cooks everything on the engine (coils, modules, sensors, wiring, and of course plastic vaccum hoses). No need to mess with your switches or anything behind the dash -- replace those thin plastic vaccum hoses to operate the vaccum switch (located just below the A/C canisters, to the right of the heater/ac blower housing) and your dash switches will magically send heated or cooled air where you want it.

possibl ac compressor clutch problem,cooling fan at rad not working so ac goes into high press mode and turns off(so it doesn,t blow system apart,built in safety)not enough r134 in system(low charge)

climate unit is bad

Would have him check out side air temp sensor ,thermister and rerove control head and inspect for burned terminal.1st.

check the compressor with the ac running and make sure the compressor is kicking in and out in not the compressor might be bad or te clutch on te front of te compressor, sometimes u can get to much freon in them to i did it ounce