Ford Excursion :: Rear AC Not Working - Bad Heater Control Valve
Jul 11, 2011
While diagnosing a problem with my rear AC not working, I pulled the rear plenum apart. I noticed the rear heater coil was really hot even though I did not turn the heat on at all that day.
I suspect a bad heater control valve. The one that stops hot coolant from going to the core when the AC is on. I have manual temp controls so I assumen it is vacuum controlled. All data does not give me a location or vacuum routing specs for the valve so I am asking here.
1) Where do I find the heater control valve?
2) Does it shut off the coolant to both the front and rear heater cores or just the front?
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So my overhead ac/heater control lights front and rear went out, where the lights are to replace them.
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I have 2005 4x4 6.0 excursion. The rear heater stop working. I just get cold air in the back seats.
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Wife just told me tonight that the overhead console and rear heater are not working in the excursion. Of course, we have a 3 hour drive tomorrow and it is cold outside.. The posts seem to center on either the readout not working or the heater not working, but not both. Trying to minimize time troubleshooting outside in the cold.
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Bought my Ranger brand new, and I try to maintain it well. Most of the 90,000 miles are highway. Anyway, the OEM coolant was supposed to be good for 100K miles, but since I hadn't done anything in 89K, i have a lengthy commute and the coolant was getting discolored, I figured that no harm would come in having a drain/refill. This was approx. The heat worked flawlessly. Fast forward two weeks, and my local shop performed an oil change (not the quick lube that did the coolant replacement). I was informed of three things:
1) my coolant was low,
2) my heater control valve was leaking (which I was shown), and
3) when hoisted I was shown that a slight residue of coolant -- not necessarily fresh -- was on my water pump.
I was told that 'down the road sometime a water pump could be in my future'. Again, the heat worked flawlessly, and I didn't want to be out-and-about in winter and run out of coolant. So, the shop replaced my heater control valve and topped off the coolant (approx. 1/2 - 1 gallon). Heat worked flawlessly. The last couple days, I noticed two things.
First, heat trickles out on low and medium setting, and second, it takes a long time to warm the vehicle. So, my limited research tells me two things. If coolant is present, and I have heat (of some sort), then, the water pump and heater core are probably fine. Diagnosis says to check the thermostat first, correct?
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02 F150, 5.4 gas motor, about 338k miles. Bought this truck well used so I would have a truck when I needed one. Someone has removed the heater control valve. I've got a new one, but there is a port on the top for a vacuum line, but where this line plugs into.
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Where Gen5 Camry heater control tab/valve is located? I can't seem to find in engine bay. Is it in cabin under dash? Under drivers side dash, I can only see heater control valve cable. I have got a hot coolant coming to heater core, so heater control valve must have gone bad.
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Replacing a heater control valve for a 2004 Jetta? My car's vents only blow hot, and I checked the cables and saw that the control arm was disconnected. I tried to put the cylinder piece back in and had some luck, but I can't get it to sit tightly in there and it keeps falling out. Also, it still wont change the temperature coming out of the vents. I assume that something broke on the inside piece that the cylinder connected to.
[URL] ......
Here is an example of what mine kind of looks like, but mine is way more loose.
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The heater/AC control panel does not turn-on automatically after the engine is started occasionally, during this time none of the buttons are working and blank display. The only way I can get it turn back on is re-starting the engine, sometime it takes more than 1 re-start.
I thought the relay ? or the signal driving the relay has something to do with it. Where is the relay for the Heater/AL is located ?
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I have an emissions test coming up. I have 3 P codes that I'd like to eliminate before then. I don't want to "fix" the issues they are telling me about. Just make the codes go away. I know why they're there I just need to get rid of them.
What I have coming up is:
P0475 Exhaust Pressure Circuit Valve (result of EBPV delete)
P0541 Intake air heater A circuit low (result of aih delete)
P0640 Intake air heater control circuit (also result of aih delete)
What resistors I'll need and where to put them in?
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I just bought a used 98 Acura 3.0CL. I've noticed that when the heat is cranked, it doesn't blow hot at all. I did some quick research and came up with two answers thus far; check the antifreeze coolant and that I may need to replace the heater control valve. Am I "warm" on the area?
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I have been hearing different things whats wrong but its cold here in the winter and I have 6 kids I need my heater. My heater doesn't work. It will turn on and blow out air but it never gets hot not even a little bit. My AC kicks but heater doesn't work. What can it be???
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My wife's 08 mountaineers heater has stopped working on every setting but high it has the dual climate control with rear heat and ac I've heard there's a control module behind the glove box. Is this true and how hard is it to replace?
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The water level is up, the heater hose is hot on both sides of the heater hose bypass valve, the MtrCrft thermo is pretty new, but it blows cool air out the vents even after a half hour of driving. It was working great last week and then nothing. I guess you can see the blend door moving if you pop the glove box out?..........haven't tried that.
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I'm 1/2 way through a flush and water pump replacement. Its going to get cold and I don't want to blow any heater lines. I have the pump off and the block drained (I also managed to get some coolant into the block - but not the rear heat).
I don't see an easy place at the front to disconnect the lines. I'd like to blow them out just to be safe. What is the best place to disco in the front or if I even need to - can I just disco 1 in the rear and then blow in both direction?
I fear that there may be some vent door closed that will prevent flow. I can't start the truck - I can turn the key on.
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The driver side seat heater on my '05 X is not working. The orange light comes on but no heat. The passenger side works fine. Where I should start my troubleshoot? Any common/known problem areas?
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I have a 2003 Ex with the 7.3. There is a leak in the rear coolant line just in front of the rear right tire. Is there any way to bypass the rear heater under the hood?
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So I own a 04 GLI and for some reason I went to turn my lights on one day and the lighting to my Heater/AC controller light is not working.
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Have this problem?
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I have tried the dealership 3 times and have not been able to get the rear heater to work properly. When the vehicle is moving I have heat but if I slow or stop the heat goes away. I believe it only happens to the rear heater as front feels fine.
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I have a 1994 suburban1500 heater is not working in front or rear and in the front I have no control on the vents it only blows on the floor flashes if I try and change from floor to vents or defrost also blows air on floor while driving with the fan off so seems that the vent is stuck open the rear I have control on vent or floor just will not blow heat just outside temp air I had the same problem with a buick I had and never figured out the problem this is driving me crazy.
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