stock temp unit

hey guys does anyone know where the stock temp unit is located on my 4.3 its a 1998. i figured itd be on the head somewhere? but im not seeing it? thanks!

Intake manifold, next to the thermostat housing? To the driver side of it normally.

hmm i might have to look at a diagram or something i duno what it looks like. im only asking because i need to tap my passenger side head on my 5.3 for the new temp senor unit adapter from S&P and then attach the temp sensor to it correct?

if you got a 12mm adapter from S&P you should be able to pull the plug that is screwed into the block on the passenger side head and replace it with the adapter. Don't install it permanently until you put the engine in the truck. You could tap the water pump housing and install the original sensor in it. The right rear of the engine is really crowded for room once its installed in the truck.

the sensor for the gauge is drivers side head

true, the LSx sensor is there but he's adding a secondary sensor for his 98 gauge.

maybe im confused but i thought he was hooking up the temp gauge not for the puter

the one for the LSx PCM is in the front of the driver side head. There is a blank hole in the rear of the passenger side head for an extra sensor if needed during a conversion to signal the factory gauges. I'm not exactly sure if the 98 needs an analog signal to the dash for the water temp, though. I was thinking the 98 Vortec dash was digital but I'm not the least bit sure of the V6 dash. Most of them were analog in earlier models. You have to have the LSx gauge in the engine and hooked to the PCM or you get codes and the engine runs like crap.

i know what ur saying on my 98 i taped the pass side head for the sending unit for my gauge

yes exactly what im doing is removing the plug from the passenger side head on my 5.3 and drilling and tapping it for the S&P adapter so i can put the temp sensor from the 4.3 on it so my factory gauges work. im just not sure what the 4.3 temp unit looks like? you said its on the intake? i was under the impression that i had to leave the stock temp unit in the 5.3 and hook that up aswell for the computer to work correctly but and in having 2 the motor would run fine and id get to have my dash read correctly. same with the oil pressure sensor that i had to swap. maybe ill take a pic of the 4.3 and someone can draw a red arrow in paint to the piece i need to remove cuz evidently im special. i figured itd be in one of the head like the 5.3 but its not.

If you're going to tap the head then there is no need for an adapter, just tap it the same size as the water temp sensor. The adapter was so that you didnt have to drill the head, which is no problem either unless you make the tapped hole too large.

oh no kidding... hmm maybe ill just buy the adapter and not tap the head at all. that would be nice. i jsut went outside adn took some pics ill post up what i think it is. you lemme know. thanks..
kyle

k is it this one here???

http://i216.photobucket.com/albums/c...ensorpaint.jpg

thats for the computer, but if u can tap the head for free u will save the 20. dollars for other parts

yeah whats 20 bucks im no pro at tapping things i think ill just spend the extra $$ im already thousands in anyways lol whats few more :(

i fell your pain still need to do more work on mine like the ac and other crap lol

I cant find anywhere that shows more than one sensor for the water temp in a 98 model truck so that has to be it. It has two pins in it, correct?

on my 98 has two sensors the gauge is a one wire

yeah 2 pins

Hey if you decide to go with the s&p adapters I will sell you the two that I have. I went with Autometer gauges and don't need the adapters anymore.

There's 2 coolant sensors in the 96-2000 L31's. Use the green 1 wire sensor but I'd recommend tapping the head if you want a true temperature reading. The adapter sticks out so far that you'll see a 10 - 25 degree difference.

oh no kidding well that sucks i just put the head on today!

put some grease on the drill bit to catch the chips as you drill the hole. Take a vacuum and suck the chips out that go into the engine. Same with the tap, coat it in grease and thread it.

Yep, you can do it with a 90 degree drill if you have a steady hand. LOL

guess ill have to try it then hah. thanks guys! i dont want my temp guage off that bad...

okay well i was dubbing around with the 4.3 the other day and some frigen how i over looked the temp sensor on the head its a 1 wire sensor with a rubber gromet covering it. this is the one i should be using correct? the other one i pulled has a long dipstick looking thing like the one in the drivers side head of the 5.3

Yep, thats the one you should have been using. Save some engine money for an eye exam. :laugh:

dude SERIOUSLY GREG i was like WHAT THE HELL i eagle eyed that whole damn motor then i was moving the thing out of the way and i just noticed it... and i was like you must be fing kidding me....