• Heating AC and Engine Cooling
  • Chevy Astro
  • Heater Cores and Blower Fans
  • Car Heaters

Your 1998 astro rear heater blows cold air what could be wrong with it and how do you fix it?

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βˆ™ 2006-10-31 06:44:23

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On the Astro and Safari vans, there is a vacuum control valve on the engine side of the firewall that controls the flow of water to the rear heater. Looking from the front of the van, it is on the left (passenger) side of the engine about 12 inches below the hood line. When you turn the rear heater on, the valve opens to allow hot water to go to the rear heater. If your van has lost vacuum pressure, the valve will not open properly. You will probably also notice that the airflow director for the front heating/cooling system will not change positions. This loss of vacuum pressure is usually caused by a broken or disconnected vacuum line. Find and repair the break or reconnect the line and this should restore function to both systems. If the airflow director for the front system is working, then the valve itself may have failed. You can either replace the valve. A quick fix is to remove the water lines from both sides of the valve and use a 3/8" plastic connector from the hardware store to connect the two lines. Use two clamps to secure the hoses to the fitting and you should be back in business. For a picture of the valve, go to and search for part # BK 6601320.

2006-10-31 06:44:23
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