Passat (B7) :: Below 20 Won't Defrost The Windows Or Heat The Cabin?
Jan 12, 2016
Seems below 20 my car cannot defrost the windows or heat the cabin. It has been 0-10 the last couple days here in SE WI. The coolant temp gauge is straight up right in the middle. Some how coolant isn't flowing through the heater core. Could this be a design failure? It doesn't seem to matter what settings are on dash. I have tried with ac on and off, recirculation on and off, full defrost on, fan on all speeds, have also tried a combination of cracked windows open.
Are other people experiencing this as well? Is a call to the dealer in order?
For ref car is 2014 tdi se with 34,000miles.
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I have bought a new 2008 Passat about 4 months ago. about 2 months ago, this weird pressure could be felt from the inside similar to having the sunroof opened or the rear windows opened. I took it to my dealer twice and they say that they don't feel/hear anything. I went on a 200 mile trip and regretted taking the passat only 20 miles into it. the pressure/noise thing is unbearable! I seriously am thinking of crashing this thing and making my insurance switch cars. it was never like this when i got it. I would never buy a car like that! I checked to see if the tires were the problem but found nothing. i am so frustrated at the dealer and with this car that it just sits there not being driven because i can not stand driving it. Again, it makes a weird pressure/noise feeling as if the windows are opened but they aren't!
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My windows do not defrost. Blows hot air and seems to blow out defrost vents ok. When I bought the truck last winter no problem untiL A /C would not cool cab in summer. Now it's winter and no defrost.. I have takin into dealer and they said compressor is kicking on ok but still no moisture leaves the cab. It is dry here in Kansas so when we get rain I will have to sponge the windows.
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2003 f150 lariat FX4 5.4L ... The heater only blows on defrost, Which vacuum line controls this? is it the black one that runs through the fire wall? What else can I check to narrow the problem down? this truck has the push button/digital controls.
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I thought I wouldn't have need of the defrost for several months yet, but today we had unusually cold rain and my windows soon fogged up. The fan (not a/c) was already running at a very low setting (one or two clicks only) when I depressed the defrost button. Roughly 15 seconds later, it was like a hurricane in the cabin! The fan moved to the highest setting all by itself. This did clear the windshield in seconds, but it was a bit disconcerting. This phenomenon repeated itself all three times that I engaged the defrost button. Is the defrost supposed to do that? I swear, the sudden change startled me so much, I hit my head on the ceiling of the cabin...
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The heating system on my 99 3.4. I'm not getting hot air when selected to full hot or defrost, The air is warm but not hot. I do have water flow through the heater core, I have not changed the thermostat yet. Could it be the dashboard control panel, When I place the blower fan to full on, the fan goes off??
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I have a 2001 Montana. Recently I have no heat/air movement via the defrost vent. All other setting work along with fan. Plenty of heat when set on floor or dash vent. Just doesn't work with the defrost setting in either alone or with the floor.
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I have a 1999.5 Jetta 2.0 question:
When I run my defrost with the heat on, I smell antifreeze pretty strongly. I am also having trouble keeping the windshield defogger/defrosted without the heat constantly blowing on it. Signs point to heater core, right? So I tried a bottle of Bars Leaks aluminum radiator stop leak with the metal flakes in it. When I run the heat on the feet or front/face/torso setting, it does not smell like antifreeze (unless it's when it very first starts and it's so slight that I don't notice). When I run the defrost with the heat on, it smells pretty strongly of antifreeze. I see no antifreeze on the passenger side carpet.
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I have a 03 explorer and when on defrost if I turn the temp to hot it changes from defrost to heat, also if i lower the temp setting a little it goes back to defrost,this has manual heater control and I replace the control head and did not solve this issue.
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I'm headed north in a couple days to the frigid regions of the country and I little worried cause my blower fan is now completely non-functioning (no heat, no defrost ). It came on a couple times since I bought it recently, usually after hitting a bump and stayed on for a while, but now it hasn't come on at all in a while. I checked all the fuses, they all looked good.
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The door in the dash wont go to defrost. It just quit today. I assume its vacuum controlled. What do i need to do to fix it? I thought about pulling the dash vent where i can reach in there n have a look but it doesnt want to come out. 1992 Toyota Camry....
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Every thing was working great then the AC quit. I ran through the air selector and all I can get is panel and defrost with no heat. I checked the vacuum line on the passenger side engine compartment and it looks good. Oh I also took the control apart and 3 of the five holes had vacuum to them.
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I have an 06 F-150, there is lots of heat but it only blows on defrost. Is this the blend door motor or is it something else?
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I just picked up another 2003 XLT and I'll be taking it in for inspection on Monday. Hoping it will pass easily, but there are a couple issues I'd like to address before going in there.
First and foremost, the heat/AC system is stuck in defrost. It will turn off when the selector is moved to the OFF position, but any other position just makes the air blow out the top of the dash. I did do some research on this beforehand (the seller made me aware of it) and I first looked at the actuator. When moving between positions, the actuator does not move at all. It does appear to be connected to the vent door's arm but there's no movement when going around the dial. I do hear what seems to be a relay kick on or off as I go through the different modes, but that's it. Does this point more towards a vacuum issue?
Second, and less significant...the self-dimming rear view mirror doesn't dim. It doesn't even power on. Where might the connection go for that mirror? Would be handy to have for night driving, but not that big of a deal if it's not functioning.
I'm also going to have to get the tailpipe mounted...seems it came off at some point and the seller asked me today if I wanted it. Uh...yeah, I'm gonna need that to pass inspection!
I am liking it so far. Runs well, rides well...I will be enjoying this one as well.
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I have a 2002 Ford Ranger 3.0L truck that, all of a sudden, has a problem with the HVAC system that blows air only thru the defrost vents even when selecting any other vent levels (defrost, face/middle or floor levels).
I did find a thread on another forum regarding this problem, only it was for the 95-01 Ranger model years, yet they say that the 2002 Ranger is not the same as those earlier models.
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I just picked up a 78 F150 Ranger XLT with a 351M in it this past friday. I am absolutely in LOVE with her. She is a great solid truck. One issue I am having though is that she blows hot air out the vents over the hump but nothing is coming out the top of the dash. I am guessing that i will have to take the dash off and clean out the box check the door etc. What did you do to rectify?
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After not starting my car following several days of extreme cold, my battery died a couple of weeks ago, and after boosting the battery, I noticed a couple of electrical accessories (power windows, rear defrost, rear brake lights) are no longer working. I was told by a mechanic at the local Wal-Mart that it was possibly the main relay, which I replaced at the dealer, but that did not fix the issue. I've checked the individual fuses for these accessories, and all of them are OK. How to troubleshoot this?
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I bought a used 99 f250 v10, i went to turn on the a/c today, and it only blows where the defrost is toward the window. it gets cold after awhile, but nothing out the vents, the heat either.
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My 02 Mountaineer doesn't have any air flow volume out of the heat, defrost, or a/c vents. The temp will change from hot to cold and the air direction will also change from floor, dash, windshield, etc. The a/c recirculation door also seems to be working. The fan sounds as it is running very fast, just not putting out any volume. What should I look for?
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My 2002 chevy venture does not provide any heat from the cabin air system..The engine reaches proper driving temperature normally.Can't heat the cabin or get any modulation of cabin temp when using A/C.
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I took the 2008 Santa Fe Limited into the dealer for no control over heat in cabin. It turned out to be a air mixing valve actuator failure. Since the car had 60714 miles on it I needed to convince the dealer, since this is a common failure, that Hyundai should stand behind it. Since it failed before I brought it in, it failed before the 60k mark. The dealer supplied the part and I the labor.
Before I brought it in I replaced the thermostat. An old school problem fix for insufficient heat. That did nothing. Upon disassembly i found it very difficult to get at. You need a lot of patients to do this task and reversible wrists and elbows due to its location.
Also, in looking up the control system in the Factory Repair Manual I discovered this Limited heat/AC panel has an internal self-diagnosis that you can trigger. It did indeed indicate a faulty actuator. The dealer was not aware of the self-diagnosis facility having not been taught it by Hyundai during training.
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