How often should the cooling fans be running on a manual 3.0 Omega?
The fans seem to be on quite a lot. E.g. If driving along at a steady 30 or 40mph and you come to a stop the 3 fans are quite likely to be running and sometimes they're running at high speed.
At idle speed the fans cycle, at low speed only, on for about 30 secs, off for about 45 secs and the temp gauge oscilallates between 96C and 94C.
Accelerating up a hill doesn't make the gauge get any hotter than 96C
Driving down a hill with the heater on and no throttle for about 1 minute the temp dropped to 92C on the gauge.
At steady motorway driving the gauge is around 95C but I'm not sure if the fans are still coming on.
Is this normal?
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If you have the air con on the fans will also run. On 3.0ltr Omega's they may have three fans! one inside the rad & two in front of the condensor. it is worth making sure the inside one is free & works with the air con off & both other fans work with air con on. The front fans will also work for the rad as the switch is staged. These cars do suffer from the rads silting up inside & causing overheating. When the engine is hot & waters flowing through rad it will be worth checking to see if the rad is hot from top to bottom on the and should gradually drop as it flows across the rad. hot water flows in on battery side of car
Regards
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Thanks for that
Sorry, Should have said the the AC is off (its bust actually, expect the gas has leaked)
All 3 fans are working.
I had a feel around the radiator and as far as i can tell its hot all over but I can't get to much of it as the condensor and main fan gets in the way.
Temps measured with infra-red thermometer:
When the rad gets to about 104C the fans come on
The top quarter of the rad (i can only measure the top part) behind the main fan quickly drops to 60C while the far RHS out of the cold air stream remains at 104C.
Moving to the left out of the main fans cold air stream the temp is about 95C, being cooled by the air pushed through the condensor from the AUX fan.
I did wonder whether the dirt on the condensor will restrict the air flow but I think that will need to be replaced to get the AC working again, and the rad has to come out at the same time so we'll try and get it flushed and see if any silt comes out. Hopefully that will fix it.
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I have removed many a rad on one of these and they do get awfully clogged up externally as well. it may be worth pressure washing the condensor and radiator by spraying a degreaser into the fins & jet wash through. Dont get too close to the rad with the jet wash. You may be astounded by how black the water runs out underneath from all the grease & road dirt that builds up
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My current Omega (2.0) used to waggle up and down on the temperature guage rather more than I was used to, when I bought it.
I gave the cooling system a flush through with one of the proprietary products ( can't remember the make but it was in a bright purple bottle ) and this calmed things down considerably; probably worth ago for a few quid if you don't mind draining the coolant system twice, at least the radiator has a proper tap!
Might also be worth checking that the auxiliary electric coolant pump fitted to the 3 klitres is working, or at least is getting power to it, sorry I don't know its location, I've never had a 3 litre :-(.
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its located in the o/s inner wing low down. it runs on a timer relay so that water circulates for a few minuets after the engine is switched of to stop the water boiling in the heads
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The water at Russelheim must have been exceedingly hard, as Omegas do seem to suffer from radiators which block from the bottom upwards until they effectively become a letterbox shape and size.
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