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There could be a few possible causes for the rear heater not blowing hot air in your 2003 Chevrolet ASTRO van. Here are a few things you could check:
Make sure that the rear heater control valve is fully open. This valve is located near the heater core and controls the flow of coolant to the rear heater.
Check the coolant level in the radiator. If the coolant level is low, the heater may not be able to produce hot air.
Check for any leaks in the coolant system. If the system is leaking, it may not have enough coolant to produce hot air.
Check the thermostat. If the thermostat is stuck closed, it may not be allowing enough coolant to flow through the system to produce hot air.
If these steps do not help, it is possible that there is a problem with the heater core itself, or with other components of the heating system. It may be necessary to have a mechanic diagnose and repair the issue.
You are low on coolant. It needs to be recharged. The pump won't come on if it's low on coolant in order to protect the system as the coolant contains oil to lubricate the system. You can buy do it yourself recharge systems for relatively cheap or go to a shop.
If you don't know the difference between "coolant" and "refrigerant", you probably should not be fooling around with the A/C, it can be dangerous. And yes, words do make a difference. That is how we communicate. The best thing you can do if you want to work on vehicles, is get some books and educate yourself. The low side port is going to be somewhere between the compressor low side (the larger line) and the accumulator/dryer. Find the line and follow it. It can't be too hard to find as it is a general service port.
there are usually two lines for the A/C. they are usually a dull silver aluminium but sometimes covered with a black rubber protector. The valves (plugs) to recharge your A/C look like an over size tire valve where you put air in your tires. The kit you got from the part's store to recharge your A/C should be able to explain the rest of the directions to you. It is a vacuumed system so be careful when messing with it and follow all the direction's with the kit. If you loose the vacuum you will have to take it to an A/C shop to have it put on a machine to pull a new vacuum on it.
Attach the end of the recharge hose to the low side pressure port on the passenger's side of the engine compartment, near the firewall. Look for the metal coolant lines and follow the lines to locate the low side pressure port. The port is usually covered by a plastic cap. Screw the discharge end of the recharge hose -- the end without the handle/valve -- to the pressure port.
Screw the valve end of the recharge hose onto the top of the can of refrigerant. Turn the handle clockwise to pierce the top of the can of refrigerant. Turn the handle counterclockwise to allow the refrigerant to flow into the hose.
Start the Cutlass. Turn on the air conditioning to the maximum setting.
Turn the can of refrigerant upside down and gently swirl the can. This moves the refrigerant from the can to the hose and into the air conditioning system.
Insert a thermometer into the interior of the center air vent and test the temperature of the air coming from the duct. It should be approximately 35 degrees colder than the ambient air temperature.
Add more coolant if necessary. If you are using 12-ounce cans, unscrew the first can and screw the hose onto the second can. Turn the handle clockwise to pierce the top of the can, then turn it counterclockwise to allow the refrigerant to flow into the hose. Do not add more than 24 ounces to the system. Take your Cutlass to a service center if you have added more than 24 ounces to the system and there is no difference in the temperature.
Turn off the engine of the Cutlass.
Turn the handle on the recharge hose clockwise to seal the can of refrigerant of it is not empty. If it is empty, unscrew the can from the hose. Unscrew the discharge end of the hose from the low side pressure port. Place the colored cap over the pressure port.
You can use any premium brand. Simply follow the directions on the container. It will also tell you how often to drain & replace the coolant. Most brands last either one or two years. The drain valve is on the bottom back side of the radiator.
Some times they are hard to find.Find the high side line/hose,on the compressor,follow the line until you find the ac high side service port.The small line is the high side,If I can help any further let me know [email protected]
sounds like moisture in system freezing up in the expansion valve. might recover 134. pull sys down and recharge. you know after thinking about this. what about clutch cycle switch.
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