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inside temp display not accurate?

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Old Apr 10, 2007 | 08:46 AM
  #1  
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Default inside temp display not accurate?

Didn't know exactly how to word the subject line, but here is what I'm asking.

Driving my (new to me) 2000 Coupe the last couple days to work. It is still pretty cold outside here in Ontario, around -2C/28F. So I have the climate control set on "auto" and play with the temperature setting until its comfortable. I find that I need it set at 28C or 29C! Now I still have a fairly warm coat on, and I realize that everyone is different in what they find to be a comfortable temperature, but that is around 83F and I really don't think I have it that warm inside (or I'd be sweating). I haven't checked it with a thermometer, but it seems to be not calibrated right. It isn't really a major problem, since I can still adjust the temperature to what I find comfortable, but it does seem a little strange.

It also seems to take a long time to warm up inside (and the car is in a garage that is well above freezing) and I have to bump up the fan speed to maximum for around 15 minutes or so before I get much heat in the car. Does anyone else, who is driving in these kind of temperatures, find the same thing? Is there something I can check for in the climate control system?

thanks,
Rick
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Old Apr 10, 2007 | 09:15 AM
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What's the coolant temp when it warms up fully? If stock thermostat, it should be about 190 F. Someone may have put in a 160, or left it out completely. The heater will not heat as well until the coolant temp is up. If the thermostat is opening too soon, or stuck open in cold weather, your heater will only blow lukewarm air.
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Old Apr 10, 2007 | 09:30 AM
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The engine seems to warm up fairly quickly. The gauge is pointing vertical, at the 90C mark, which is 194F (I'll check it with the DIC next time I'm out). I haven't checked around to see if air is coming out all of the proper vents, though I think the heating is mainly from the lower ones when the system is on auto.

Rick
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Old Apr 10, 2007 | 10:39 AM
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Hi Cobraboy -

There is an outside air temperature sensor that can go bad.

If that sensor is not functioning, it can screw up the HVAC system's ability to keep the car warm or cold inside.

Also - I believe that you have to be moving at a certain MPH (16mph?) for so many seconds before the temp sensor will get a good reading.

I read that in the owners manual if I remember correctly.

best regards -

mqqn
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Old Apr 10, 2007 | 10:53 AM
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Another indication that the outside temp sensor is faulty is it shows the incorrect outside temp.

It's a somewhat fairly common problem, and very easy to replace. The outside temp sensor is located underneath the car, passenger side, by the bottom of the radiator.

jeff
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Old Apr 10, 2007 | 11:23 AM
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I appreciate the help, but I think the outside temperature sensor is working fine since it does display the correct temperature.

Maybe it just takes a long time to get the inside warmed up when it is cold out and I'm expecting too much. Then again, my 4cyl PT Cruiser warms up the interior in half the time (with a bigger interior!).

Rick
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Old Apr 10, 2007 | 11:56 AM
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Originally Posted by Cobraboy
I appreciate the help, but I think the outside temperature sensor is working fine since it does display the correct temperature.

Maybe it just takes a long time to get the inside warmed up when it is cold out and I'm expecting too much. Then again, my 4cyl PT Cruiser warms up the interior in half the time (with a bigger interior!).

Rick
your PT Cruiser has a much smaller coolant system and warms up much faster
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Old Apr 10, 2007 | 02:44 PM
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Hey Rick, I think I qualify as being in a similar climate, and I have no problem getting warm - in fact, a lot of times I do not even turn the system on, I get enoiugh heat without it. In colder temps (like -20 up to +20F), I put the heat on, and assuming that the engine is warmed up, the whole cabin gets toasty within no more than 5 minutes.

Originally Posted by Cobraboy
I appreciate the help, but I think the outside temperature sensor is working fine since it does display the correct temperature.

Maybe it just takes a long time to get the inside warmed up when it is cold out and I'm expecting too much. Then again, my 4cyl PT Cruiser warms up the interior in half the time (with a bigger interior!).

Rick
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