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95 gasser temp sensor.

ak diesel driver

ak diesel driver

6.5 driver
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Posted this here to get the most views/response. Helping a friend with his 95 k2500 454 truck. Has 2 temp sensors one on driver's side for the gauge one on pass side for the ECM. So the pass side sensor is broken barely all there. We cannot find the sensor that fits the plug. I've gone through all the sensors on RA and none of the pic's show the correct one. Any ideas on where to look for one??422d40c5-0756-4233-80e5-3a4d747e6317.jpg
All the one wire ones have kind of a mushroom shape instead of the rounded sides like in the pic.
 
I don't know if the 98 is different I will go down and look at my truck in a few minutes. And see if the sensor is different and if I can get any numbers off of it. If my memory serves right. I think my temperature sensors are on passenger side and at the water neck up in the front of the valley but I will double check in a little bit.
 
Hey Les, I apologize I had taken the day off to take my wife to an appointment and they had canceled when I read this message. About 10 minutes later they called to say it was on and I totally forgot. The blue connector comes out of the wiring harness on the driver side but it attaches to this white connector that then goes down to the temperature sensor on the passenger side17704151987262965855461048305827.jpg
 
No problem. So to update what I've learned so far. Yes the one at the thermostat is for the ECM. I had a scanner on it and could watch it go to -40 when unplugged. Drivers side is definitely for the gauge so what I don't know is the purpose or function of the one on the passenger side.
 
Looks to be the auxiliary cooling fan temperature switch.

Are the coolant temp sensors the same?

Hi everyone this is my first post here. I always read on this site and I'm so happy it exists. So, what is the difference between the sensor near the thermostat vs the one on drivers side head? I know the thermostat one is for the ecu and the head is for the dash but I cannot find any info on...
www.gmt400.com www.gmt400.com
 
iirc all 454 models in that era had an aux electric cooling fan behind the grill. it's mainly used for when the AC is on, but also will turn on over a certain engine temp which I think doesn't run through the ECM, the sensor is simply a ground switch that will trigger the relay for the fan.

if there isn't a fan behind the grill on the passenger side (pusher fan) then look for a connector for that fan, it might have gotten removed for whatever reason or GM just didn't put one in.
 
ak diesel driver said:
So you are indeed correct as usual glagulator. There is an electric fan in front of the cooling stack . I never would have guessed. It also makes me question why the diesels didn't have one.
Click to expand...
And it would come on at about 205*F.
IDK if it would push air through the cooling stack, but, every little bit would help.
 
In the southwest- when overheating becomes an issue, removing the fan actually helps. 95% of the hummer community understands it because of the insane angle our radiators are at.
What happens is in slow traffic or at a stop light & the main fan isnot on yet- the electric fan helps. When traveling above the speed of air the fan can produce or whenever the manual fan is on… the electric fan becomes an impedance to flow.

Imagine it this way: if fan produces 40 mph wind and moves 7,000 cfm- that is all it handles, right? So when the fan is subjected to 50 mph going down the hiway, that fan would have to overspeed to allow the faster air travel. Or if the huge mechanical fan is moving 18,000 cfm and the area which the fan is in can only handle 7,000- most the air has to go around the fan to where nothing is restricting air flow.
So if you have an issue where overheating (wether engine or hvac) at stoplights is the problem, electric fans can help. If you have issues at higher speeds, the electric fan hurts.

Its an unusual situation for most of the country, I understand. But in the southwest we have the highest heat combined with lowest humidity. And the low humidity greatly lowers the efficiency of the radiator. Wanna see how much humidity helps- on a hot day idle your rig at home and measure the air from your ac. Now take a water bottle and mist the condenser & watch how cold it gets.
There is tons of things folks from super cold areas learn that here we just wouldn’t have a clue to. But if ya look up Vegas as the driest city in the country- we learn these things mighty fast.

So if that truck spent anytime around here- the fan gets yanked. When I would do it for folks I would tell them keep it for if they move or sell the truck. But the majority just throw it away.
 
MrMarty51 said:
And it would come on at about 205*F.
IDK if it would push air through the cooling stack, but, every little bit would help.
Click to expand...
Actually it comes on at 234* and off at 211*.
I understand why the fan wouldn't work for us Will I'm just surprised the GM engineers didn't think we'd need it.
 
So near as I can tell the logic on how the fan is controlled is that it engages the fan mostly for AC and the switch in the head is more of a the engine is getting to hot so let's turn on the fan
 
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