What does the air take hose function

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:

1. 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.
2. Check the coolant level in the radiator. If the coolant level is low, the heater may not be able to produce hot air.
3. Check for any leaks in the coolant system. If the system is leaking, it may not have enough coolant to produce hot air.
4. 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.

Could be that your heater matrix is blocked or has air in the system

I would check the IAC motor or idle air control motor, heres a little info.about the part.Stratus Sedan, 1999-2005 Idle Air Control Motor

• DESCRIPTION & OPERATION
• REMOVAL & INSTALLATION

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Description & Operation

Not for Dodge Stratus Sedan
The idle air control motor (IAC) attaches to the throttle body. It is an electric stepper motor. The PCM adjusts engine idle speed through the idle air control motor to compensate for engine load, coolant temperature or barometric pressure changes. The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the air bypass passage and regulates airflow through it.
The PCM adjusts engine idle speed by moving the IAC motor pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning).

Fig.

Not for Dodge Stratus Sedan
When engine rpm is above idle speed, the IAC is used for the following functions:


Off-idle dashpot Deceleration air flow control A/C compressor load control (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
The idle air control motor (IAC) attaches to the throttle body. It is an electric stepper motor. The PCM adjusts engine idle speed through the idle air control motor to compensate for engine load, coolant temperature or barometric pressure changes. The throttle body has an air bypass passage that provides air for the engine during closed throttle idle. The idle air control motor pintle protrudes into the air bypass passage and regulates airflow through it.
The PCM adjusts engine idle speed by moving the IAC motor pintle in and out of the bypass passage. The adjustments are based on inputs the PCM receives. The inputs are from the throttle position sensor, crankshaft position sensor, coolant temperature sensor, MAP sensor, vehicle speed sensor and various switch operations (brake, park/neutral, air conditioning).

Fig.

When engine rpm is above idle speed, the IAC is used for the following functions:


Off-idle dashpot Deceleration air flow control A/C compressor load control (also opens the passage slightly before the compressor is engaged so that the engine rpm does not dip down when the compressor engages)
Target Idle
Target idle is determined by the following inputs:


Gear position ECT Sensor Battery voltage Ambient/Battery Temperature Sensor VSS TPS MAP Sensor
Target idle is determined by the following inputs:


Gear position ECT Sensor Battery voltage Ambient/Battery Temperature Sensor VSS TPS MAP Sensor

Removal & Installation

1. Disconnect the negative battery cable.
2. Disconnect the IAC electrical connector.
3. Remove the IAC mounting screws.
4. Remove the IAC.

To Install:

1. Install the IAC to the throttle body.
2. Tighten mounting screws to 5.1 Nm (45 inch lbs.) torque.
3. Attach electrical connector to the IAC.
4. Connect the negative battery cable.
   
   

   Fig.
   

1. Disconnect the negative battery cable.
2. Disconnect the IAC electrical connector.
3. Remove the IAC mounting screws.
4. Remove the IAC.

To Install:

1. Install the IAC to the throttle body.
2. Tighten mounting screws to 5.1 Nm (45 inch lbs.) torque.
3. Attach electrical connector to the IAC.
4. Connect the negative battery cable.

Tha code indicates the secondary air system has incorrect airflow

This can be caused by the output of the air pump being blocked
the air bypass solenoid is leaking or blocked or is stuck open or closed
the air injection pump hoses are leaking
or your PCM has failed.

Check that all your hoses are not leaking or plugged first
then verify the solinoid is functioning

There is a good possibility that your hard starting and poor idle can be contributed Valveto theto the Cold Air Idle Control valve. This valve regulates bypass air and will cause idle and start problems.. It is very important that the temperature sending unit is functioning correctly because it tells the computer what stage of operation the engine is in, controlling all the computer functions and operation of said. Good Luck, Ned

1 Inspect Air Filter Clogged or Dirty Air Filter. 2 Inspect Fuel Filter Clogged or Dirty Fuel Filter. 3 Inspect PCV Valve Clogged Emission System. 4 Inspect Choke Thermostat Stuck or Improperly Functioning Choke Thermostat. 5 Inspect EGR Valve Improperly Functioning or Faulty EGR Valve. 6 Inspect Carburetor Carburetor FLOODING. 7 Inspect Valve Burned, Worn, or Sticking Exhaust Valves. 8 Inspect Hose (PCV)at Clogged or Collapsed PCV Hoses.

check the idle air bypass valve, mass air flow meter and TPS (throttle position sensor)

being a certified mechanic has its advantages. there are multiple causes for that problem: lack of air or lack of fuel.
make sure the air filter is mostly clean.
check throttle plate (where air filter tube goes into motor), most likely black with soot and carbon. clean with tooth brush and gas, wipe off with clean rag. repeat ultil CLEAN.
low air flow past plate when closed (idle) will cause stall condition.
dirty throttle body is a common problem with lots of cars. causes engine stall.

dirty fuel filter will also cause this problem.. low fuel pressure at idle.

I also believe that your car is equipped with an idle air control valve. (regulates a bypassed air flow to motor at idle) this valve may be stopped up or non-functional. have local shop take a look, but there are ways to check valve if you consider yourself mechanically inclined

sounds to me like your having a air leak... my hose on my tahoe had a tiny pin leak in it and it did the same thing... check the small hose that goes from the air filter to the head of the motor... that was where mine was if not, check your o2 censor...