Q&A

 Enthusiast

1. Check to see if there is good coolant flow to the heater core by removing the delivery hose from the heater core. Place the hose into a container and then start the vehicle. There should be a large amount of coolant coming from the hose.

2. Check the flow of water through the heater core by attaching the upper hose and then remove the lower hose of the heater core. Attach a hose to the outlet port of the heater core. Start the vehicle. The same amount of fluid should be coming from the heater core that was present when checking the delivery side.