Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: omegalyn on 04 June 2007, 09:28:03
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Hi there folks,
I recently flushed and changed the coolant with a nice 50/50 pink mix, as how to, in my 2.0 4pot, however when in slow moving traffic or stand still the temp creeps up until fan comes on . this might be normal, but I an sure it never use to come on as often, when I changed the coolant I flushed it out loads of times and let the engine run with the filler tank cap off with the heaters running flat out. Have I got a problem!
Thanks
Lyn
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What temp is it hitting ?
Mine is running alittle hotter in this weather between 90 - 92 in slow traffic and between 82 - 85 on motorways.
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Mine is running at 92 on a run and creeps up until the fan kicks in in trafic, only since I flushed the coolant.
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Mine is running at 92 on a run and creeps up until the fan kicks in in trafic, only since I flushed the coolant.
Lyn, 92.5 is nornal running temp.
It should creep up to about 95 when idle, and the fans should bring it down.
If this is how it's behaving, then it's fine.
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Hi there James
Yes it seems ok on a run about 92/95 But it dose creep up to about a 100 when stationary about 5 mins before the fan kicks in.
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Hi there James
Yes it seems ok on a run about 92/95 But it dose creep up to about a 100 when stationary about 5 mins before the fan cocks in.
That's definately too warm...
You say this has only happened since you did a flush?
Did you use VX antifreeze with a 50/50 mix?
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Pop the stat off on the passenger side of the engine at the front - 2 x torx bolts. (easy on the 2.0) and make sure it's not sticking shut. Believe you can still test this in a saucepan, and bring it to the boil.
From memory, you did a cambelt change not long ago. Did you do the water pump at the same time?
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No Halfords 50/50 mix, shal I get my coat!
Yes did the pump. what a memory
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No Halfords 50/50 mix, shal I get my coat!
Yes did the pump. what a memory
Tsk... ;) ;D
Personally speaking, I have halfords A/F in my 2.0, and that doesn't overheat, so it shouldn't be a reason why yours does either.
Try the stat test, very quick to do, and a bit of fun :)
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Thats the main thing :y I shall test tonight
Thanks
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Check the fan switches are working as expected. v6 ones switch in 2 stages, resulting in slow and fast speed fans. Presumably 2.0l is the same...
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There are three fans on the 2.0, one behind rad and two in front of condensor, air con automatically switches on one of them (I think), does it run cooler if air con is on?
If the thermostat is OK, you may need a new rad switch, I had this happen on the Sunbeam, overheating big time, but mine totally conked - bridged it to cool the engine back down. If it decides to operate a few degrees higher....
I suppose the rad has been felt for cool spots?
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Pretty sure two stage too - they used to go mad when parking up after a thrash or towing.
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hi All
just got back from work and the car temp was 92ish but did not have to stop until I got home. after reading on here I had a look for the fans, only found one behind the rad (see picif it works) If the thermostat was not opening wouldent it overheat on the open road? and the water in the header tank stay cold? .
I am sure that my fan only comes on when realy hot not in two stages, as mentioned, I shall have a look in haynes to see if this is correct When I turn the air con on the one fan behind the rad comes on
http://i191.photobucket.com/albums/z57/lynsfotobucket/PICT0001.jpg
thenks
Lyn
Fun! Fun! Fun!
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Not another in front of the rad?
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yes just had a look through the front grill and there is another fan (you boys are good). is this the first stage fan, I have only seen the one at the back working when the temp is about 100digs.
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my 2ltr does something very simular and a friend who is a very good mechanic said this is nothing to worry about, it was mot ed this weekend and we had it on the gas emmisson tester with the revs at about 3-4 thousand rpm and he said that if there was a problem it would have boiled over during this test, but im intrested to know about the fan in front of the rad i know about the one behind the rad and that kicks in when the temp reaches about 98 degres but this takes the temp down very quickly to about 92 degres so looks like tomorow i will be checking the front fan to see if this works ok
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just been out and checked mine the fan in the front does the air con turn on the air con on and the fan starts up, turn off the aircon and the fan stopes so i think mine is ok, but it did have a problem with the hbv a few weeks ago it was leaking and drawing in air and that was causing it to heat up very quickly, but since replacing this it runs cooler and takes longer before the fan comes in. just when im happy with how its running something comes along and puts a doubt in my mind, i think ill check the tempreture senders tommorow and the thermostat what temp should these open at if you put them in a pan and bring it to the boil ??????
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I have just had a look at mine and i only have 2 fans is this normal for a facelift ? one on the outside of the rad to the left as you look towards the car and one on the inside of the rad to the right.
I know the one on the right on the inside of the rad kicks in as soon as the air con is switched on but am i missing a fan on the right on the outside of the rad ?
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the 4 pots have 2 fans, v6 have 3 (assuming aircon). 2.5td have 2 electric, one viscous - stupid bloody germans....
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Thought it was two in front but it is over two years since I whipped it all out
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stupid bloody germans....
:-? :-?
;D
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Update, I have had a good look, and yes there are two fans one at front left look through the front grill, and one at the back right in front of the air con. Mine only come on full both, when the temp hit around 98digs, or when I turn the air-con on,
Gizza, the thermostat starts to open at 92oC and is fully open at a 107oC (haynes). How long ideling does it take for your car to get to 98digs for the fan to come on ? someone mentioned a rad switch, where is this located? and finally should the fans come on in two stages.
Thanks for the feedback guy’s.
Lyn
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.... but it is over two years since I whipped it all out
Be careful! Especially near spinning fans! ;) :y :y
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.... but it is over two years since I whipped it all out
Be careful! Especially near spinning fans! ;) :y :y
Aghhhhhhh!!!!!!!!!!!
I took the lot out to replace the condensor
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Fan switch is under the top radiator hose.
It's not uncommon for them to get gunged up and become a bit lazy, Might be worth removing the fan switch and cleaning the surface of the sensor.
Mine only come on full both
Do you mean the rear fan doesn't come on at a slow speed, just flat out?
In that case, have a look at the white resistor under the battery. This is what gives the fan its' slow speed. Maybe the resistor has burnt out, which would mean that instead of coming on at a lower speed, at a lower temperature, it's only coming on at all when the temperature hits the high speed setting.
Kevin
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Hi there kevin
Yes my fans only come on at 98oC and not at low temp. I shall have a look after work for the resistor and clean the switch.
Thanks for the advice, only thing is, it's only don this sinse I've flushed the coolant, maybe I put in too much A/F. I put in about four Lts wich I think is correct for a 2.0 auto.
Thanks again
Lyn
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just got off the phone to a vauxhall dealer where i spoke to one of the mechanics that works on omegas alot and the 2ltrs fan is only a single stage fan comes on when the car reaches between 98-100 deg, he said if the car runs between 92-95 when moving its fine then if you stop and the temp goes up and the cooling fan kicks in before it hits 100 deg then every thing is fine, hes had 5 or 6 people in the last few mounths with omegas thinking their cooling systems are goosed but they were fine simular thing happening as with mine
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Thanks for that Gizza :y :y :y
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Sorry for leading you up the garden path with my 2 speed fan idea!
Glad it's sorted anyway.
Kevin
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Glad of the help Kevin, Thanks to you all. :y
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just got off the phone to a vauxhall dealer where i spoke to one of the mechanics that works on omegas alot and the 2ltrs fan is only a single stage fan comes on when the car reaches between 98-100 deg, he said if the car runs between 92-95 when moving its fine then if you stop and the temp goes up and the cooling fan kicks in before it hits 100 deg then every thing is fine, hes had 5 or 6 people in the last few mounths with omegas thinking their cooling systems are goosed but they were fine simular thing happening as with mine
Sorry, I really can't agree with this. None of my Omega's (inc 2.0s) have ever gone anywhere near 100 deg on the temp gauge in any conditions
There's still a prob here...
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My 2.0 never went over 100 even when towing
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fan should cut in at around 94 to 96, mine cuts in about 95, 100 is to high i think,mine has just had coolant change ,changed it my self,got red stuff from vauxhall was only £11.40 for 5 litres cheaper then hallfords(15.99).does run a lot cooler though with red stiff rather than on the old blue stuff that i dumped out of it :y
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my 2 ltr never goes over 100 deg the fan comes on at about 98 and the temp goes down very qiuckly but i might check and change the the temp switch to see what this does but ive had a vaux dealer and my mate who has his own garage tell me theres nothing wrong with it, ill see how much a temp switch is from auto vaux and go from there
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just spoke to auto vaux and the sensors are £9.95 each so for peace of mind and an experiment got them ordered, they owed me around £25 for a faulty hbv that i sent back to them, ill change out the sendors and see what hapens and see if makes a difference its had a new waterpump coolant and hbv very recently and theres no air locks in it and the coolant is vauxhall stuff at a 50/50 mix.
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New fan switch is a sensible move. If you want to test them, connect a multimeter on ohms across the contacts and place them in a pan of boiling water. They will go "click" and the resistance will drop to 0 ohms at the correct temperature. If the switch is specced to close at 96, it will need a few minutes in vigourously boiling water to operate. If it's fubar'ed no amount of boiling will get it to close, because you'll never achieve 100 deg C plus!
This technique can also be used to test the accuracy of the gauge sender. Remove from engine, extend wire from engine loom so you can get the sensor in a pot of water (a small camping stove avoids the need to park the Omega in your kitchen!), run a ground wire from the sensor body to the battery negative terminal, ignition on, heat water and see what the gauge reads. A thermometer in the water will allow you to calibrate it over a range of temperatures.
Kevin
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Thank for the feedback folks,
I am going to check the coolant mix first, as this is what I did before I got this prob, if that dosent work then shall go through a list: stat, heater switch, etc, until I get a result. This might take a bit of time as I am in the middle of putting in a new kitchen, am now at the tiling stage, the walls are ORANGE with white units (wife’s input) ,looks ok though.
Anyway thanks again for lending me your thoughts, I shall keep you posted
Lyn.
:y :y :y