Buick Skylark heater issues

1996 BUICK SKYLARK
120,000 MILES • 6 CYL • FWD • AUTOMATIC
Avatar
TOMCAT1078
  • MEMBER
  • 1 POST
1996 Buick Skylark heater only blows warm when driving on hwy. It starts blowing cool air when idling or driving at slower speeds. What could be the issue?
Jan 11, 2011 at 7:46 PM
Advertisement
Avatar
JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 POSTS
Make sure the coolant is full. With the engine hot, running, heater on high, feel both heater core hoses. Both should be hot. If they are not both hot, there is a restriction in the heater core. If they are both hot, have the blend air door checked.
Jan 17, 2011 at 3:14 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.