Where is that sensor? I know my car is under warranty but it's only a $10 part that I would rather replace myself than sit at the dealership for several hours while they try to figure out what to do.

 

Attached is the procedure for its replacement. Perhaps you can make sense of it - I can't. And no, I did not cut it short. What you see is all there is in what I have.

 

Thanks Andy. I'll put it up on the lift and start searching in that area.

 

Good luck - really shouldn’t be too hard to ID the sensors.

 

Interesting that the ambient air temp sensor appears to measure air temp close to the road level and a tire. Just the temp you need for a warming of freezing temps near the road level. Thoughtful, realistic place to put it. I think some early cars, cars even now?, present the temp of air going into the throttle body as being the ambient air temp. The throttle body inlet temp is the temp used by the fuel injection computer for calculating gasoline flow to the cylinders.

 

"Front tire front air deflector, right side"

Sad when the text offers more insight into where to look than the picture Soooo, under the passenger's air deflector?

 

Update. I removed the pass. side underbelly pan and after a bunch of searching I found it. It's almost impossible to see. It's actually in front of the pass.A/C condenser attached to the back of the grill area. I saw a wire harness in that area and followed it to the sensor otherwise I would never have seen it.Unfortunately, I had to remove the protective grill to get at it but no big deal.
Got an A/CDelco sensor coming tomorrow . $10 from Amazon.
The problem I was having is that it took anywhere from 20-30 mins. before it started to change the display to the current outside temp. and even then, sometimes it wasn't accurate. If this doesn't fix the issue I'll have to take it to the dealer.
68/70Vette - In it's position, the sensor isn't affected by anything other than the air coming through the grill as the belly pans protects it from any other outside influences.


Thanks again Andy. No way I would ever have found it if you hadn't given me a starting place to look.

 

Oldboomer - it also looks like you have the best color C8 ...

 

Exact same sensor appears to reside on the lower right edge of the stock airbox... I only know this because I finished an Eventuri CAI install this past weekend. Seems odd they would care about the air temp in the engine bay (no, it's not in the airflow leading into the airbox). It's right above the tranny, so I suppose it could be related to that... but if so, I would prefer a sensor that sits within the fluid, not the air outside.

 

Perhaps the one you saw is to signal the engine bay cooling fan to run.

 

It is exactly for that purpose, and it is described in the manual. "Engine Compartment Cooling Fan Description and Operation
The engine compartment cooling fan system is composed of two electric cooling fan motor and control module assemblies. The integral motor and
module is a solid-state device with a driver capable of handling the high current demands of the fan motor. The under-hood air temperature sensor
is an input to the fuel pump driver control module. The engine control module (ECM) and fuel pump driver control module communicate via serial
data. The ECM uses the under-hood air temperature sensor to determine the desired engine compartment fan speed which in turn is communicated
to the fuel pump driver control module. The fuel pump driver control module controls the fan speed by sending a pulse width modulated (PWM)
signal to the engine compartment cooling fan control module. The engine compartment cooling fan control module varies the voltage drop across
the cooling fan motor in relation to the pulse width modulated signal, allowing the cooling fan to operate at variable speeds."

It is difficult to find in the Service Manual, because its not named consistently. Its called the underhood air temperature sensor in the descriptive text. But the replacement for it is called
"Ambient Air Temperature Gauge Sensor Replacement (Engine Compartment Air Temperature)". And notice that it mentions "Gauge" in the name, just like it does for the one found in front. The "Engine Compartment Air Temperature) and its location in the illustration makes clear (I think) that this is the one that would be used for the rear cooling fans. If there is yet another one, I can't find it. There are other temperature sensors for different purposes, and I think they may be all the same. The manual is 7000 pages with no index, so you never know.

 

Where are you getting those pictures? Do you have an electronic service manual or something?

 

Service manual from ebay. Search c8 shop manual.

 

Hey, it possible to find it by hand, by reaching around to you feel the cord? And is it attached to the bumper or is it attached to the front part of the car?