Momma has to haul the kids around in this thing starting Monday! Ok, so here's the deal. I have a 2003 Jeep Liberty Rnegade that I don't feel heats properly. What I mean is, with the temp knob all the way to HOT, and blower at 4, I get "luke warm" heat at best. I live in MN, so its pretty darn cold here now. Even after driving the vehicle for 30 min, temp gauge is at half, as it always does, and the heat is still sub par. I had the thermostat replaced a week ago at CarX, I put in a new blower motor resistor, and a new heat/ac control nob panel. I have been doing a little digging online and the only ideas I get are basic troubleshooting BEFORE resulting to this. Yes, they are done. Coolant is not leaking, there is no air block in the coolant system, both heater core hoses are hot, thermostat is not sticking etc. Im relatively good with mechanics, but suck at electrical. I think it could either be the "blend door" not opening properly, or the blend door accuator. However, after numerous hours of digging, I can't seem to find where either one is located, or how to get to them... Any advice or other possible ideas would be greatly appreciated. The last thing I want to be doing is hauling this to a mechanic and having them chase a problem around. Labor for the blend door books at 3hrs or so, at 60-80 bucks an hour... HA! I think not... Thanks again!

Unless you have the proper tools and can chase vacuum leaks it might be best to give it to a qualified mechanic to fix properly. My suspicion is a bad vacuum line.

Unless you have the proper tools and can chase vacuum leaks it might be best to give it to a qualified mechanic to fix properly. My suspicion is a bad vacuum line.

I don't like that answer... Any better ideas? I REALLY want to stay away from a mechanic... No offence to any of them out there, but I think they are extremely overpaid. :-) But I guess when you work in a profession where people NEED you, you can get away with that... I'm totally in the wrong business... ;-(

You can try to have the radiator and heater core flushed out.

You can try to have the radiator and heater core flushed out.
B E A utiful idea!! However... If you actually READ the first post, I had stated that the thermostat was replaced already... I don't know about you, but if I already have the thermostat out and most, if not all of the coolant drained, it gets flushed as well. This, my friend, is the answer I was NOT looking for... also stated in first post. Troll.

Momma has to haul the kids around in this thing starting monday! Ok, so heres the deal. I have a 2003 Jeep Liberty Rnegade that I don't feel heats properly. What I mean is, with the temp knob all the way to HOT, and blower at 4, I get "luke warm" heat at best. I live in MN, so its pretty darn cold here now. Even after driving the vehicle for 30 min, temp gauge is at half, as it always does, and the heat is still sub par. I had the thermostat replaced a week ago at CarX, I put in a new blower motor resistor, and a new heat/ac control nob panel. I have been doing a little digging online and the only ideas I get are basic troubleshooting BEFORE resulting to this. Yes, they are done. Coolant is not leaking, there is no air block in the coolant system, both heater core hoses are hot, thermostat is not sticking etc. Im relatively good with mechanics, but suck at electrical. I think it could either be the "blend door" not opening properly, or the blend door accuator. However, after numerous hours of digging, I can't seem to find where either one is located, or how to get to them... Any advice or other possible ideas would be greatly appreciated. The last thing I want to be doing is hauling this to a mechanic and having them chase a problem around. Labor for the blend door books at 3hrs or so, at 60-80 bucks an hour... HA! I think not... Thanks again!


Just because you don't like or think our suggestions are useful, no reason going and getting snotty with your replies. You have given very little information and from that we are suppose to come up with an answer that you like! How rude of you. We do not know how mechanically inclined you are so we have made suggestions based on a person with limited abilities. You have either a bad door motor, a vacuum leak or a problem in the cooling system. YOU figure it out from there since you are so negative!

B E A utiful idea!!! However... If you actually READ the first post, I had stated that the thermostat was replaced already... I don't know about you, but if I already have the thermostat out and most, if not all of the coolant drained, it gets flushed as well. This, my friend, is the answer I was NOT looking for... also stated in first post. Troll.

Wrong. Not all of the coolant gets drained OR flushed when you have a t-stat replaced. Sediment deposits will remain in the radiator and/or heater core until they are flushed out; draining and refilling your cooling system doesn't cut it.

Next time, don't ask for help seeing as you don't think anyone except you knows how to fix your truck.

I think that your heater core is blocked or partially blocked if you say the hoses to the heater are hot, then the logical thing is the heater core itself. Being a 2003 means that it's probably close to "drop dead" time. My 1994 Jeep GR Cherokee at age 10 needed a new radiator as it had successfully dropped dead. My heater works just dandy though and never had problems here in downtown Ohio. Jeeps are good cars and I love them, but they tend to have radiator/heater core problems.

How about on the house going to the heater cor under the hood is thir a vac control on the house ? By pass that

how about on the house goin to the heater cor under the hood is thir a vac control on the house ? by pass that

This is thread is from January 2009. The OP hasn't been back.

And also, if you bypass the heater core, then you're not going to have any heat whatsoever. He's already complaining that the heat is weak.

No I thank that on the house going to the heater cor thir is a vac control valve

no i thank that on the house goin to the heater cor thir is a vac control valve

It doesn't matter. If you bypass the heater core, there will be NO heat at all. It doesn't matter if it has a vacuum control valve or not.