Jake

Hi all;

The ambient temperature gauge on my dash (2004 f-150) is pegged at 140 degrees. I tried to find the location of the sensor in my Hynes manual but, it doesn't list it. I think it's located in front of the radiator. Is there a way to test this or do I just need to replace it? Anyone know what the cost is?

Thanks;

Jake....

SinCityFX4

I don't know about testing it, but I think that the sensor is the on that vertical beam in front of the radiator.

DennyCrane

The location is correct. There are 2 sensors on the beam in front of the radiator.
It's the upper one! The one without the barcode!

I replaced my to clean it because it showed the 140F too, but it didn't worked out

I guess I have to buy a new one, it's about 50 bucks...

Tell me if you found out something else OK?

Bye

rickyp

Is it the round one with the little thing sticking up from the top?

DennyCrane

I hope this works.. It's the one looking like a screw!

rickyp

what is the other sensor for?

Mod (Ret.)

To confuse it with the water temp sensor used by the cluster gauge.

I believe they are both engine temp sensors; one is used by the cluster gauge, the other is used to send a signal to the PCM (power control module) so it knows the engine is cold (for "cold startup" fuel enrichment) or warm (disable "cold start" enrichment).

To be 100% sure, I'd need my repair book to verify the location. Every engine has a sensor for a PCM, and I doubt the share the same one to drive both circuits (cluster gauge and PCM).