Heater
#2
Its got to be one of two issues. Vacuum leak on one of the hoses or rubber elbows or a damaged blend door which controls airflow. The only way to really check for a leak is with a vacuum pump. Check the line starting at the nipple coming off the vacuum pump near the power steering pump and work back to the firewall. The rubber elbow on my 24valve was very brittle.
Good luck
Good luck
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