01-03-10, 09:16 PM
On a 98 Catera I have no heat from any inside vents. On the vacuum hose that leaves the reservoir by the cabin pollen filter I have a strong vacuum. That hose goes in to the cabins climate control unit. The vacuum hose that comes back from the control unit has no vacuum. The controls are set for high heat but only cold air comes out. I thought it may be the HCV but when I checked and had no vacuum where the hose enters the top of the HCV I wanted to make sure I was testing this correctly.