Close
QUESTIONS

RepairPal is your advocate for car care advice and guidance

Q: heater on 1990 Buick LeSabre

hello my heater only blows out the bottom but when i put the ac on it will blow out the bottom vent's and the defrost what do i do? thanks
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
Take a look underneath your dash for any disconnected or damaged vacuum hoses. You likely have a vacuum leak that is keeping the vacuum driven motors that turn the doors inside your dash for ventilation control from working.
Check the three way tee on the firewall. You will find it following the vac hose from the cruise servo check for leaks.
Didn't find what you were looking for?