my heat only blows through the defrost no matter what I turn it on. it wont come through any where else
Sep 10, 2013 at 6:02 AM
vent problems
SMANNS14
- MEMBER
- 1 POST
Your HVAC system is actuated by engine vacuum. If the system will only work through the defroster, then you have a vacuum leak. Check for leaks both under the dash as well as the supply hose from the engine. Somewhere you have a leak and it is not allowing you to change the air flow direction. If you start the engine when you are looking, you may get lucky and hear a hissing noise from the leak's location.
Let me know what you find.
Joe
Let me know what you find.
Joe
Sep 10, 2013 at 10:59 AM
check for a vacuum line that would go through the firewall to under the dash... sometimes they break in the engine bay, and dont allow vacuum to make it to your control head....
Sep 14, 2013 at 12:40 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement
parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.