i have a 2000 toyota 4 runner.. and the heater has gone out but the air conditioning still works. whats the problem
Nov 29, 2010 at 3:18 PM
ERNEST CLARK
✓Experienced Mechanic
1,730 POSTS
First of all, do the controls work? If so, check heater control valve at the firewall. If that's good, check for a blockage in the heater core by attempting a flush. If that's good, you'll have to remove the HVAC unit and look for a stuck blend door or leaking vacuum line/solenoid.