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5

Does your car overheat too? If so, you could have a faulty thermostat, an air pocket in your cooling system or maybe even a leak somewhere. My truck's heat would only work while I was driving, then stopped working altogether while the engine started to overheat. I changed the thermostat, then the heat would blow hot/cold/hot/cold, I didn't realize you had ...


5

If the thermostat is stuck open, you would get the symptoms you describe. A thermostat stuck closed will cause overheating.


3

I would check the water pump, it sounds like the blades may have corroded away. From your description it certainly sounds like the water isn't circulating.


3

I'm in general agreement with Ben. Cooling fan not working. The description of high vehicle speed = okay and low speed not means your fan isn't working for you. This could be a problem with fan controller, fan motor or temp sender used to turn on fan. Note, the fan shrouds matter big! Ensure they are sealed off to radiator correctly. Please check the ...


3

You need to purge your cooling system. Raise the front of the vehicle with a jack or ramps. Driving up a sidewalk works too. With the engine cool (when you touch it it should be cold): Remove the radiator cap. Run the engine. Turn on the heater. Accelerate the engine to 1500-2000RPM. You will see the coolant level go down and/or bubbles. Pour in some new ...


3

If you haven't done this already, check your antifreeze levels of your overflow and radiator when cool. Make sure both are full. Often times, there can be an air lock preventing antifreeze from circulating through the heater core. I normally leave the coolant cap off and jack up the vehicle in the front after starting the vehicle and letting it warm up ...


3

It depends on the vehicle, why it is being left, and how it is prepared before being left. If it's a vehicle that's in reasonably regular use, then I'd recommend making sure it's used at least once every week or so, and is driven far enough for the engine to get up to full operating temperature. Just starting it and letting it run is better than nothing ...


3

The reason this occurs is to take care of the humidity in the vehicle while your defroster is running. MANY older vehicles have this as a common function when your defroster comes on. It's odd though that the temperature setting doesn't change your AC temp. Chevy's 2011's were all CAN BUS computer controlled systems, it might just be a glitchy computer ...


3

As far as I understand it, your pollen filter is filthy and should be cleaned or replaced.


2

My guess is that the ACC temperature sensor is getting wet, confusing it into thinking the interior is colder than it really is. If you have an "interior temp" reading on your dash, it probably uses the same sensor. See that it shows about 58 when wet and normal temperature when dry. If that's the case... find the sensor! If you don't have a service ...


2

Air Vent Odor This issue is bacteria in the ventilation system. This is not related to charging the air conditioning system as some have indicated. They are separate systems and you do not get Freon in your cabin by using the air conditioner. The ONLY way to attack the problem IMO, is to; remove the vents from under the dash and clean them out. ...


2

Issue #1: You probably blew the second resistor. Sometimes it just happens. I'd take it back to the place you bought it from and tell them it was defective. Issue #2: It sounds as though your thermostat is stuck open and should be replaced. If coolant is allowed to flow unchecked through the system, you'll only get cold air through your HVAC until the ...


2

One possible explanation is that some coolant is bypassing the thermostat altogether. Depending on the thermostat and seal arrangement, this could happen if the thermostat isn't properly seated in the surrounding seal, or if the seal is compromised and not doing its job properly. It would also explain to some extent why the thermostat seems to work when ...


2

I'm pretty sure the thermostat is stuck open. The coolant/engine won't heat up fully and you'll get cool coolant through your heater core. In most vehicles (and I'm pretty sure this is how the Dodge Ram's work) the coolant goes from the engine to the heater core directly. If the engine is running cold due to an open thermostat, only cooler coolant will be ...


2

Using the heater has no effect on fuel consumption. Using the heater won't lower the engine temperature because the thermostat will keep the engine temperature constant. It may actually use a tiny bit more gas from the electrical draw because of the blower motor.


1

I was trying to find a picture for you but to no avail. The best thing that I can recommend is have someone turn the mode switch back and forth while you crawl around under the dash and listen for which motor is making noise. This will be external to the heater box. Once you locate the mode control motor, remove it. The motor will have a male shaft ...


1

Some cars have a small electric pump for creating coolant flow around the heater matrix. I don't know if your car has one of these, but if it has, it could be the problem.


1

Is it a gradual change? Like when you turn the speed selector dial, does it slowly get cold? Or does it just literally instantly change? Are there any noises you hear when you change from low to different speeds? This is important. I believe they use HVAC control units in those and that may be causing the problem. There are two motors, one for vent control ...


1

Things to check: Is the engine fan running slowly at idle? If so, its a sign that it needs replacement. Is there a funny smell in the cabin? Refrigerant tends to slowly leak and has a weird smell. Have a friend smell the cabin air in case you got used to the smell (due to driving it all the time). For more and better help we will need a bit more info.


1

Unlikely. The window defrosters don't get hot enough to damage anything.


1

Here is what solved the same problem for BMW E39: Cause: The smell is due to bacteria in the air-duct. Solution: To solve it you need something with antiseptic action to eradicate the bacteria. There are many Antibacterial Cleaners for Automobile Ventilation System, however, I used simple and cheap pharmaceutical Salicylic alcohol 2%. Procedure: empty ...


1

Your coolant is not flowing. A stuck thermostat is likely. Bad water pump is also possible. Make sure your serpentine belt is installed properly.



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