AC BLOWS COLD AIR BUT HEATER BLOWS COLD AIR ALSO...
1999 Buick Century
A/c blows cold air, but heater blows cold air also. What could be the problem?
Monday, December 24th, 2012 AT 1:11 PM
Check to see that both heater hoses are hot when engine warm if they are thenit's an actuator problem in heater. Or control. Check for a vacuum leak and check where i've pointed out in pic. They may not be working