Moderator: volvite
With the vehicle lifted up and rps up do I leave any of the caps open(radiator or overflow tank)?smj999smj wrote:Set all of the heaters to the maximum heat position, jack up the front end of the vehicle, and run the engine between 2000-3000 RPM for about 15-20 minutes until the rear heater blows hot. If that doesn't work, you may have a bad heater pump (located at the firewall and has two heater hoses connected to it) or possibly a bad mode door actuator on the rear heater unit.