HVAC Extra Heat
Thread Starter
Melting Slicks
Joined: Sep 2000
Posts: 2,404
Likes: 418
From: Chester Virginia
HVAC Extra Heat
When the car is sitting in the driveway I can get the air temp down to 53F w/ the AC on max. Once driving the temp goes up to about 68F w/ the AC still on. When I turn off the AC the airbox at the passenger's heat gets warm. I have the heater hoses valved off and the air doors operate properly in the driveway. I have found the condensate drain under the evaporator not to have the rubber hose on it so I have a 1" opening for hot engine compartment air to enter the HVAC air box. This opening is about 12" from the exhaust manifold/exhaust pipe. This will be correct tomorrow. I have cover the airbox side facing the exhaust manifold with aluminum faced insulation. I find it hard to believe that this 1" opening will allow enough hot air into the air box to affect the air temp 15F. Are there other places in the interface with the engine compartment / airbox / firewall that have been found to leak air into the airbox or the plenum? How the heater core inlet tubes sealed from the airbox?
Roger
Roger
Pro
Joined: Jul 2004
Posts: 605
Likes: 0
From: Alta Loma CA
I found that a small hole makes a large difference. But one place often overlooked is the rubber tube that goes from the right side of the air box to the fan motor. Without that hose, both the fan and box are sucking in hot air instead of circulating cool air.
