New sensor causing coolant temp issue

[dieseldoc]

Got an 02’ 550, 7.3 and auto.  Came for leaking water pump.  Pull it apart and the sensor housing is cracked.  Put in a new water pump, stat, housing, hoses and a coolant temp sensor in the water pump.  Start back up and gauge reads normal temp with engine stone cold outside( -15 F). Unplug sensor and gauge drops to cold, short the pins and gauge pegs hot and check gauges message comes on.  Call parts they swear to me the sensor is correct and that’s what it was built with and this sensor has been used from 99-04. So I get another thinking it’s a failed new part( happens sometimes) same issue.  Go to another truck that temp gauge works as it should and plug in both new sensors and same issue on that truck. So this tells me it’s an issue with the sensor.  The original had a gray body and was keyed.  New sensor is black with no key.  Can anybody shed some light on what the deal is? I have asked twice to make sure they are not getting the oil temp and coolant temp mixed up, they assure me nope this is the one in the water pump.  Thanks guys

[tonybullitt]

I have ran into this before it's the wrong sensor. I don't remember how I went about getting the correct one though sorry I am no help with that. 

[tonybullitt]

If I remember correctly there are 2 temp sensors one for pcm and one for gauge and it's wrong in parts catalog. What part number did u get?

[mchan68]

There is no PCM input for ECT on any 7.3L, only EOT. The coolant temp sender is used exclusively for instrument cluster gauge indication on this engine.

[dieseldoc]

That is true.  If the book is possibly wrong maybe I should ask them for an oil temp sensor and see what I get.  This is really starting to annoy the crap out of me.   Remember the old days when you looked in a paper book or microfiche, 99%of the time you got the right part and it worked out of the box and actually lasted......    I will look up the part when I get to the shop, invoice and part are on the bench

[mchan68]

Why haven't you tried a known good sender? You just said you plugged in the two new senders into another truck that gauge is working properly on, and got the same result if I understood correctly. I vaguely recall years ago I ran into this exact same issue on another vehicle too.

[8WA Sman]

Try F5AZ-12A648-A

[Keith Browning]

Did they just look the part up by application or were you able to get the engineering number off the old sensor? Sometimes crossing over that number works best.