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#1
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Sudden Jump to 120*C and Then Jumpy Needle
Going down the freeway, think I hear something, check my gauges, and see coolant temperature is at about 120*C. Keep a real close eye as about right on and not in the red. I soon see it cool to just below (110*C?), then jumpy. When I go a short ways on surface streets and the needle really starts jumping and twitching. Once got near my home was now bumping into 120*C, but not going over. Let it idle to cool the turbocharger, but since don't have a shroud and was going a little up, shut down. I then look under the hood and find no obvious leaks; just got home from pressure washing the engine compartment. Any ideas?
Thank y'all for the help in advance!
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Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health. |
#2
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#3
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__________________
Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health. |
#4
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Checked all three temperature sensors, and none have any damage, except one when the boot crumbed in my hand. Gauge now reads 60*C.
Checked for any other damage, and find none.
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Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health. |
#5
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Just give it a few days to dry out, then see what happens. Weird things can happen when electrical connections get wet, and everything gets wet when you pressure wash the engine compartment.
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'79 240D |
#6
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Yes, forgot about that. Next time I have a reason to go out is Thursday, so should be dry then, right? Then if still acting up, guess Friday draining the coolant and putting in flush.
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Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health. |
#7
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Spraying with wd40 will drive the moisture out if needed. You may yet have to check the connection or replace the sender itself but think not.
No indication you need a coolant flush incidentally. |
#8
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My thinking is something came loose and blocking a passage. Do have coolant disappearing and a moldy smell in the passenger footwell. But, Tram said not to worry, so not. The rusty water seems to be mostly gone, but now has me wondering.
__________________
Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health. |
#9
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No sense overthinking this one. Sensor wire connection or sensor itself are the prime considerations. Make sure you identify the right sensor.
Of course in life there are always the remote unexpected things. On average though in a situation like yours you can almost ignore them. |
#10
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Okay, I tend to do that with my condition. The sensor can be checked by unplugging, right? Or is there redundancy?Do know the sensor for the glow plugs isn't 100 percent right, but have a method around that. I will ignore them for now.
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Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health. |
#11
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Some people put too much trust in gages. There is no physical way that the coolant (and sensor body) could truly vary in temperature fast enough to make the needle "twitchy". Maybe 1 sec oscillations max.
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1984 & 1985 CA 300D's 1964 & 65 Mopar's - Valiant, Dart, Newport 1996 & 2002 Chrysler minivans |
#12
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Sure sounds like the coolant temp sensor wire. Could be wet, could have a bare spot, or a broken conductor. The sensor completes the gauge's circuit to ground through a temperature variable resistor. Intermittant connection (broken wire) = twitchy gauge. Short to ground (bare wire) = pegged temp gauge needle (hot). Diesels tend to shake, and that flex's the wires. Good luck.
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#13
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Why I suspect the connection or sensor wire as well as mentioned. Fresh water is not electrically conductive unless something like salt or another contaminate is in it. Now the blast pressure of pressure washing could shake up an old wire or connection easily enough.
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#14
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I have had the same symptoms when the alternator body was not getting a good ground, or the body to block cable connection was bad... GROUND is needed for the sensor to work right!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#15
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Thank y'all for all the help!
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At first, the swings seemed to be logical as responded to the terrain. However, down the ramp and onto surface, got wild. Bet the water moved. Quote:
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Thursday was out all day, plus most of today, and the gauge showed logical readings, not getting a little over 80*C. So, think all that happened was temporary, right?
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Current fleet: 1985 Mercedes-Benz 280TE - Waiting for heart surgery. 1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home. 1979 Mercedes-Benz 300TD - Parted out. 1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration. 1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration. 1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health. |
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