|
|
Central Kansas | My temp light and buzzer comes on when the temp gauge only rads 150. I checked the upper and lower hoses and they read about 150 so I know the gauge should be close. I also filled the upper tank but that didn't change anything. I am scratching my head on what is wrong.
 (image.jpg)
Attachments
----------------
 image.jpg (76KB - 143 downloads)
|
|
| |
|
Between Omaha and Des Moines, 7 miles South of I80 | As a generic statement, for engines and trucks around those years, your vehicle will have coolant sensors or switches for: A. Engine's ECM (sensor) B. OEM truck's dash gauge (sensor) C. OEM truck's dash idiot light / warning buzzer (basically an ON/OFF switch, at a certain temp) = may only have "one wire" to that coolant "switch" {if it is a one wire unit, then it "grounds" thru the threads of the sensor, to the engine itself}
Edited by 4WD 8/28/2015 17:08
|
|
| |
|
Mount Vernon, WA | 4WD - 8/28/2015 14:01
As a generic statement, for engines and trucks around those years, your vehicle will have coolant sensors or switches for: A. Engine's ECM (sensor) B. OEM truck's dash gauge (sensor) C. OEM truck's dash idiot light / warning buzzer (basically an ON/OFF switch, at a certain temp) = may only have "one wire" to that coolant "switch" {if it is a one wire unit, then it "grounds" thru the threads of the sensor, to the engine itself}
I'll add to the list of possibilities:
D. Fan clutch operation
E. Radiator shutter operation (if equipped)
F. Automatic transmission torque converter clutch operation
In summary, there can be a lot of switches and sensors on a coolant manifold. Sorting them out is the fun part.
Edited by Bern 8/28/2015 18:18
|
|
| |
|
Between Omaha and Des Moines, 7 miles South of I80 | Thanks Bern I kinda forgot about fan clutch switch, seeing how some trucks used Engine's ECM(for fan operation) but some still used their own coolant switch(like Horton), to operate fan circuit. About radiator shutters; Are you showing your age? LOL And I didn't even know about a Torque convertor clutch coolant switch (thanks for the info) |
|
| |
|
Wi | Torque converter clutch lockup is prohibited until a certain ECT on some trucks. Helps warm the engine up faster. On duramax pickups it's prohibited until around 160*. Warms trans up faster too. I don't think all autos are equipped this way but it's possible. |
|
| |
|
SK.. in Frozen Cold Western Canada | It has been my experience with such things, that 'quite typically' it is a Bad Inline Connection/ Loose or Corroded Ground that will often cause such things.. If you have a Wiring Schematic and a Multi-meter (and are a bit fluent in Wire-ese) you can get a long way through things fairly quickly on some older machines.. Barring that, I would suggest disassembling some suspected connections, cleaning as much as you can with a little Brass or Stainless (toothbrush sized or smaller if you have/can find) and some Contact Cleaner and Compressed Air to remove offending Dust and Crud..
** Also, if you KNOW which Sensor controls the Light/Buzzer you could 'short it to ground' and see if light goes ON or OFF _ if the sensor/connection is the culprit, shorting to ground will achieve ~ 0 ohms as opposed to a Larger or Open Connection with enough Resistance via Corrosion, etc _ if it goes OFF when shorted, it is likely a dead/dying sensor, or Dirty right there and may change when re-assembled even once corrosion disturbed!!
Good luck _ hope it might be a simple fix after all _ often is for me it seems lately!! |
|
| |
|
Mount Vernon, WA | 4WD - 8/28/2015 15:29
About radiator shutters; Are you showing your age? LOL
Never seen one myself, only heard about them. I suspect maybe they're used sometimes in Canada and Alaska? |
|
| |
M11 in 95 FLD 112 temp warning light.
