2001 grand cherokee does not change from defrost to dash or floor although heat is hot any suggestions
First off I would like to appologize for this rediculously long post. I just know that, for me atleast, it is a little irritating when people give like one line solutions. I prefer ones that explain what things are, making it so I don't have to do more research to find out what/where something is or where it is located.
I had a similar problem on my 96 jeep grand Cherokee. Whenever I switched the setting to blow from the floor, it would come out of the dash. It would however switch from defrost to the vents. After I removed my dash to find the problem, I noticed that there was a vacuum hose (looks like a really thick wire with clear plastic L-shaped joints on the end) that is supposed to lead to the mechanism that changes the air flow from floor to vent or vent to defrost (looks like a small metallic cylinder that is a little smaller than a can of soda)(im not sure about an '01, but on my '96, that canister is located just above the accelerator pedal, and you can find this without removing your dash). That hose however wasn't connected to anything. Once I plugged it back in, my heater would switch from floor to vent to defrost like it was new.
So with your problem, you could possibly have your two hoses, that lead from the back of your switch that changes the flow of the air, disconnected or missing altogether. Another possible cause could be that your vaccuum storage container (located under the hood on the passenger side) isn't connected to that same switch. It could also have a leak in the hose or the storage container itself (unlikely that it leaks from the conainer due to its strength, unless it is under your battery and the battery leaked acid on it). This means that your jeep's vacuum system wouldn't have enough force to switch from the default setting, which is defrost, to your vents or floor. But it is actually quite common for your vacuum hose, that connects directly to the container to, over time, either break or disconnect from the storage container. A good way to check if you have a major leak in your main vacuum line is to see use your cruise control. If your cruise control completely doesn't work, then your line probably has a major leak or it isn't connected somewhere.
I will give you a forewarning, that if you take your dash apart, it will be a bit time consuming, so make sure that you don't have to drive anywhere for a while (possibly the rest of the day depending on your experience). I will also warn you that you will want to be careful when working under your dash. Most things will be fine, but the small vacuum lines that I mentioned earlier, you will want to be sure you don't cut them or pinch them when putting your dash back together (not too easy to do, but possible since they just look like thick wires). Also I wouldn't recommend that you take apart the main air ducts on the passenger side. It is very tricky to remove and is kind of easy to break it or knock a hole in it (the smaller ducts that lead to your dash/ vents are a lot easier to work with and are stronger). I bought the interior of a jeep and I tore through the dash, and I ended up busting a hole in that duct.
I hope this helps and the best of luck to you.
Nov 25, 2012 |
Jeep 10 x 20