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  #16  
Old 06-18-2009, 02:06 PM
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Location: OAklandia in the East Bay
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Quote:
YOU HAVE A PHYSICAL PROBLEM IN YOUR COOLING SYSTEM!
It Ain't Electrical !
My normal operating temps are in that 80 to 85 degree range. Pushing it up hill i see temps in the 105 range. I lost one of the heater hoses a couple weeks back and i guess i lost more coolant then i thought. I removed the upper radiator hose from the radiator today and it was dry. I added another qt + to it. I think that was part of my problem.

I just thought that the aux fans turned on at a lower temp. But sounds like my switch turns the fans on at a higher temp. Im thinkin im gonna order the switch that turns those fans on at a lower temp. I will also head the advice to clean that radiator out.
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1983 300SD 70,000 WVO Powered miles
1990 300D In driveway with Head Off - Cracked
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  #17  
Old 06-18-2009, 02:11 PM
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Aux fan Relays

The Gears,

One Relay (each) for High and Low speed Auxiliary fans in the relay section
(rear) of the fuse box.
BUT,
Jumpering the Receiver/Dryer Switch [AND Getting Low Fans] proves
Low Speed Relay is Good!
AND,
Disconnecting the two Pole Connector from the Blue Temp sensor at the
top Radiator hose connection KO (Key On) and getting High Fans proves the
High Speed Relay is Good!

Problem is Mechanical to the cooling System.

EDIT: I just don't understand HOW being LOW on COOLANT can affect Temps?
[Sarcasm!]
MY Coolant LOW light on the Dash would drive me CRAZY.
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  #18  
Old 06-18-2009, 04:21 PM
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Quote:
EDIT: I just don't understand HOW being LOW on COOLANT can affect Temps?
[Sarcasm!]
MY Coolant LOW light on the Dash would drive me CRAZY.
Yar MAtie...My coolant light doesnt work.
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1983 300SD 70,000 WVO Powered miles
1990 300D In driveway with Head Off - Cracked
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  #19  
Old 06-18-2009, 08:09 PM
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Non Functional Low Coolant Alert

1.Coolant Level Sensor Bad (They come with a Guarantee to "Go Out Soonest")
2.Bulb in Dash Instrument Panel position for Low Coolant Level.
3.Wiring
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  #20  
Old 06-18-2009, 11:57 PM
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The temp gauge can be tested using resistors.
110 ohm =60 deg C
67 ohm =80 deg C
38 ohm = 100 degC
There is single post sensor at top radiator hose connection. The single
wire in series with the resistor to ground should make the gauge read. I
used 1/2 watt + or - 5% resistors. I would check the gauge first. I got this info from this forum. It is described better than what I have here, but it is a start. Good Luck
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  #21  
Old 06-19-2009, 04:06 PM
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Location: OAklandia in the East Bay
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Thanks for the info. The coolant light on the dash works. It comes on when i start the car. Im guessing sensor.
She is in the shop now getting new glow plugs, coolant, lower radiator hose (discovered leak), thermostat, and ac system checked out.
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1983 300SD 70,000 WVO Powered miles
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  #22  
Old 06-28-2009, 01:47 PM
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I got her back from the shop and she still seems to run hot. The actual temp gauge or sender maybe reading incorrect. After having her parked for an hour or so, it still reads just above the 80 mark. I took an IR gun to her this morning after a 20min drive with 80 degree ambient. With the gauge reading just above the 100 mark, i got 160 on the lower radiator line, 150ish on the upper, and about the same on the engine where the upper hose connects. I will look into this next.
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  #23  
Old 06-28-2009, 02:48 PM
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Take the temp on the thermostat housing as well.
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