heater/ac problems

[figga8n]

my heater & ac wont blow out of the vents on dash it will only blow out of the heater vent behind the radio. can anyone tell me were to start to fix this.

 

[scottyb]

Start by verifying that you have vacuum. The vac source is shared with the EGR and cruise control. There is a check valve on the firewall in the engine compartment behind the driver side valve cover. From there, it runs along the firewall to the passenger side then into the passenger compartment. There is a connector behind the glove box door, and I *think* the vac source is the purple line. You just have to track the vac lines, etc.

 

[mikesvwservice]

Start by verifying that you have vacuum. The vac source is shared with the EGR and cruise control. There is a check valve on the firewall in the engine compartment behind the driver side valve cover. From there, it runs along the firewall to the passenger side then into the passenger compartment. There is a connector behind the glove box door, and I *think* the vac source is the purple line. You just have to track the vac lines, etc.

After you follow what scottyb said, you may check the rotary vacuum switch behind (attached to) your climate control "head" unit (the switches under the radio). Mine was stuck on defrost - the rubber seal in the original rotary switch was bad - about $9 - $10 bucks at the dealer for a new switch...

 

[wagon]

Also, see if that check valve under the hood has popped. If it has, and you run lots of boost, you may have popped one of the bladders/diaphragms that operates your vents, and now you would have a vacuum leak everytime that vent is selected.

 

[figga8n]

thanks guys for the help.