I have a 2002 Jeep Liberty Limited, 3.7 L motor. The heater will not blow hot air. The A/C and fan work well. When I turn the temperature dial to hot, there is only cold air coming out. Can you assist me?

With the proper equipment, the doors can be tested to see if they are working or setting any fault codes in the computer without having to remove the dash. If this is done first, you will at least have an idea what the failure is and what to look for if the dash does need to come out...there may be a simpler solution.... With the proper equipment, the doors can be tested to see if they are working or setting any fault codes in the computer without having to remove the dash. If this is done first, you will at least have an idea what the failure is and what to look for if the dash does need to come out...there may be a simpler solution....

Can you tell me about how much a mechanic would charge to replace the temp Control Blend doors and actuator if that is the problem? Also if I continue to drive it without fixing it, will it affect anything else? Can you tell me about how much a mechanic would charge to replace the temp Control Blend doors and actuator if that is the problem? Also if I continue to drive it without fixing it, will it affect anything else?

I really think you should focus on checking the basics before you delve into difficult diagnosis. You may have a broken impeller on the water pump. You may want to remove the radiator cap when cold and check for coolant flow with the engine running at about 2000 rpm's. If you can see movement of the coolant then the water pump should be OK. Also check to see if you feel any change in temperature at the vents with the higher rpm's. If it feels that it's trying to get warmer then you may have an air pocket. Even though you have not had any cooling system work done recently, the lack of service during the cold months could lead to the same symptom (contracting coolant in colder temps allows air to enter coolant system from overflow tank). Given that you first experienced this problem after trying to jump start another vehicle you may also want to check your fuses. Some vehicles have an auxiliary electric water pump to aid in flow for the heater core. Check to make sure that all fuses for you heater-a/c system are OK. Finally check to make sure the lack of heat is present in all vent settings. If the windshield vent or floor vent blows warm while the face vent is cool then you may have a blend door problem. REMOVING A DASHBOARD FROM A VEHICLE IS AN INTRICATE AND OFTEN DIFFICULT PROCEDURE! You should be sure that there isn't a simple solution before undertaking that repair. I really think you should focus on checking the basics before you delve into difficult diagnosis. You may have a broken impeller on the water pump. You may want to remove the radiator cap when cold and check for coolant flow with the engine running at about 2000 rpm's. If you can see movement of the coolant then the water pump should be OK. Also check to see if you feel any change in temperature at the vents with the higher rpm's. If it feels that it's trying to get warmer then you may have an air pocket. Even though you have not had any cooling system work done recently, the lack of service during the cold months could lead to the same symptom (contracting coolant in colder temps allows air to enter coolant system from overflow tank). Given that you first experienced this problem after trying to jump start another vehicle you may also want to check your fuses. Some vehicles have an auxiliary electric water pump to aid in flow for the heater core. Check to make sure that all fuses for you heater-a/c system are OK. Finally check to make sure the lack of heat is present in all vent settings. If the windshield vent or floor vent blows warm while the face vent is cool then you may have a blend door problem. REMOVING A DASHBOARD FROM A VEHICLE IS AN INTRICATE AND OFTEN DIFFICULT PROCEDURE! You should be sure that there isn't a simple solution before undertaking that repair.

If it is the heater core, is this expensive to fix If it is the heater core, is this expensive to fix