HVAC heat blows warm/hot on drivers side, cool/cold passenger side (warranty issue)

[Daox]

Amazon sells them cheaply for smart phones. My father in law has one, I'll ask him tonight to use it.

[01-7700]

Amazon sells them cheaply for smart phones. My father in law has one, I'll ask him tonight to use it.

yup, $36 for a well reviewed borescope from amazon - not bad

[Cobrajet]

I also re-tested my air vent temperature. This time I used my digital multimeter. It has a k-type thermocouple temperature sensor. This allowed me to measure the actual air temperature, not just the plastic vent temperature.

Attachment 10577



For reference, the ambient temperature was 25°F, and the coolant was about 170°F.

Here are the readings I got:

125 - 98 - 89 - 79

Attachment 10576

Keep in mind that this is "automatic climate control". It is not supposed to freeze you to death in the summer or roast you alive in the winter. It is supposed to get the interior of the car to the preset temperature...and keep it there.

If you have the climate control set to 89 degrees, then once the temperature sensor reads 90 degrees it will probably start backing the heat off. I assume the temp inside the car is not getting to 89. But maybe the climate control module THINKS the temperature is higher than it is and is dialing the heat back, well...automatically?

Defective temperature sensor? Is it being blocked? The sensor is in the HVAC control unit, right? I'd try switching the controls out. And I would also try to measure the interior temperature of the car.

I set mine to 89 today, put all the air out the center vents, and did an impromptu check of the relative warmth of the air coming out. Left, center-left, and center-right were pretty darned toasty. Right was quite a bit cooler, but still what I would call "hot". Ambient outside temperature was about 37F.

[01-7700]

Keep in mind that this is "automatic climate control". It is not supposed to freeze you to death in the summer or roast you alive in the winter. It is supposed to get the interior of the car to the preset temperature...and keep it there.

If you have the climate control set to 89 degrees, then once the temperature sensor reads 90 degrees it will probably start backing the heat off. I assume the temp inside the car is not getting to 89. But maybe the climate control module THINKS the temperature is higher than it is and is dialing the heat back, well...automatically?

Defective temperature sensor? Is it being blocked? The sensor is in the HVAC control unit, right? I'd try switching the controls out. And I would also try to measure the interior temperature of the car.

I set mine to 89 today, put all the air out the center vents, and did an impromptu check of the relative warmth of the air coming out. Left, center-left, and center-right were pretty darned toasty. Right was quite a bit cooler, but still what I would call "hot". Ambient outside temperature was about 37F.

Perhaps. The system does not seem to know that there is a problem. Fan goes to full speed before heater temp is high enough. Fan stays on full speed blowing cold air.

[Cobrajet]

Perhaps. The system does not seem to know that there is a problem. Fan goes to full speed before heater temp is high enough. Fan stays on full speed blowing cold air.

Do you have it on 'AUTO'? I assume the AC been manually switched off (no snowflake icon)?

[01-7700]

Do you have it on 'AUTO'? I assume the AC been manually switched off (no snowflake icon)?

Yes, set to AUTO. When you set it to 89, the snowflake goes off whether it is AUTO or NAUTO.

[Top_Fuel]

I set mine to 89 today...and did an impromptu check of the relative warmth of the air coming out.
Left, center-left, and center-right were pretty darned toasty.
Right was quite a bit cooler, but still what I would call "hot".

That's how I would describe mine. Unless you use a temperature probe, it's not obvious how much cooler the right vent is.

I'm sure there's a logical reason why the right vent isn't as hot as the left...but I'm not willing to pull my dash apart to satisfy my curiosity. I'll wait for Doax to do that.

[01-7700]

Maybe this sensor is out of whack



but that still doesn't explain the temperature variation across the dash

[Daox]

I'm sure there's a logical reason why the right vent isn't as hot as the left...but I'm not willing to pull my dash apart to satisfy my curiosity. I'll wait for Doax to do that.

LOL, gee thanks.

I completely agree though, there has to be a reason for it. Its just a matter of time before we figure it out.

I stopped by my in laws last night and picked up the USB camera from my father in law. I didn't have a chance to give it a go yet, but soon!

Its a pretty simple and extremely cheap device. I think he paid $12 off amazon for this thing. You just download one of many apps, start it up, plug the camera in and your phone becomes the screen for the camera. Super easy to use. It also has a light on the end of it so you can see in the dark.

[01-7700]

LOL, gee thanks.

I completely agree though, there has to be a reason for it. Its just a matter of time before we figure it out.

I stopped by my in laws last night and picked up the USB camera from my father in law. I didn't have a chance to give it a go yet, but soon!

Its a pretty simple and extremely cheap device. I think he paid $12 off amazon for this thing. You just download one of many apps, start it up, plug the camera in and your phone becomes the screen for the camera. Super easy to use. It also has a light on the end of it so you can see in the dark.

looking forward to the colonoscopy report