New disco owner questions /fuel pump issue
#21
05-14-2012, 09:06 PM
Super Moderator
You could also try, when noise is present, to remove fuse 5 under hood fuse box. That is electric fan in front of AC condenser (radiator). If bearing going it can make a sound, and ECU decides when it comes on/off at various times. Failed electric cooling fan is a real problem with overheating in slow traffic and parked while idling.
You could also unplug the SAI pump to test for noise. See attached.
You could also unplug the SAI pump to test for noise. See attached.
#22
05-15-2012, 12:11 AM
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You could also try, when noise is present, to remove fuse 5 under hood fuse box. That is electric fan in front of AC condenser (radiator). If bearing going it can make a sound, and ECU decides when it comes on/off at various times. Failed electric cooling fan is a real problem with overheating in slow traffic and parked while idling.
You could also unplug the SAI pump to test for noise. See attached.
You could also unplug the SAI pump to test for noise. See attached.
When I remove the fuse what am I looking for? The fan to stop? What does this tell me?
"ECU decides when it comes on/off at various times."- this is a normal operation?
Thanks!
#23
05-15-2012, 04:50 AM
Super Moderator
Yes, removing the fuse would make the electric fan stop. If bearing noise was an issue, sound would change. ECU controls this in a variety of ways.
From RAVE:
Like Spike said, some noise that goes away after start up is normal. So you can unplug SAI pump to see if that is the culprit. Another way to run down noises, like bearings going out in pulleys, is to remove the serpantine belt and crank truck (just for a very short time, don't let it warm up). No noise = something turned by belt. With engine off, turn each item, and feel for roughness, sound, etc.
From RAVE:
Electric cooling fan switching points:
For A/C system:
On When vehicle speed is 50 mph (80 km/h) or less and ambient
temperature is 28 °C (82 °F) or more
Off When vehicle speed increases to (62.5 mph (100 km/h) or ambient
temperature decreases to 25 °C (77 °F)
For engine cooling during normal running:
On 100 °C (212 °F)
Off 94.5 °C (202 °F)
For engine cooling at ignition off (to counteract heat soak):
On If, within 10 seconds of ignition off, intake air temperature is 60 °C (140
°F) or more and engine coolant temperature is 110 °C (230 °F) or more
Off After 10 minutes or if engine coolant temperature decreases to 100 °C
(212 °F)For A/C system:
On When vehicle speed is 50 mph (80 km/h) or less and ambient
temperature is 28 °C (82 °F) or more
Off When vehicle speed increases to (62.5 mph (100 km/h) or ambient
temperature decreases to 25 °C (77 °F)
For engine cooling during normal running:
On 100 °C (212 °F)
Off 94.5 °C (202 °F)
For engine cooling at ignition off (to counteract heat soak):
On If, within 10 seconds of ignition off, intake air temperature is 60 °C (140
°F) or more and engine coolant temperature is 110 °C (230 °F) or more
Off After 10 minutes or if engine coolant temperature decreases to 100 °C
Like Spike said, some noise that goes away after start up is normal. So you can unplug SAI pump to see if that is the culprit. Another way to run down noises, like bearings going out in pulleys, is to remove the serpantine belt and crank truck (just for a very short time, don't let it warm up). No noise = something turned by belt. With engine off, turn each item, and feel for roughness, sound, etc.
#24
05-15-2012, 11:20 AM
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#25
05-15-2012, 03:35 PM
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#26
05-15-2012, 08:07 PM
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It seems to be turning off and on randomly. Probably to cool I would assume?
It has been in the 90's here the past week, so maybe it is working more than usual.
Tomorrow is the big drive line rebuild and tranny flush.
Next wednesday is the fuel pump.
I met someone today with a rover that was like looking in the mirror. Pretty strange. She bought it at 100k miles one year ago and it now has 145k . That. is. nuts. She said she has not had any major issues since owning it.
#28
05-15-2012, 08:44 PM
Super Moderator
re: It seems to be turning off and on randomly. Probably to cool I would assume?
While fan does turn on/off for HVAC, under conditionas already posted.... what if fan is coming on because your coolant temp is constantly hitting 212F (another reason it comes on)? If it is the electric fan, then you should determine if fan is supposed to make that much noise ( I would not describe it as a jet airplane, but then few things make the noise of an F-15) - or if it has a worn bearing, etc. If cycling on and off frequently, and you are not in stop and go traffic, in hot weather - since fully open thermostat temp for that truck is 204F, and operation in the 190's is desired .... Do you have noises inside like water rushing through pipes under the dash? You could have air in coolant, or low coolant, if engine is staying around 212F.
While fan does turn on/off for HVAC, under conditionas already posted.... what if fan is coming on because your coolant temp is constantly hitting 212F (another reason it comes on)? If it is the electric fan, then you should determine if fan is supposed to make that much noise ( I would not describe it as a jet airplane, but then few things make the noise of an F-15) - or if it has a worn bearing, etc. If cycling on and off frequently, and you are not in stop and go traffic, in hot weather - since fully open thermostat temp for that truck is 204F, and operation in the 190's is desired .... Do you have noises inside like water rushing through pipes under the dash? You could have air in coolant, or low coolant, if engine is staying around 212F.
#29
05-15-2012, 09:05 PM
#30
05-16-2012, 10:34 AM
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