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Discussion Starter #1
My car's viscous fan just wont shut up. Its ok while its getting to normal operating temperature but once it gets there the viscous takes lots of revs to shut up. As soon as the revs drop below 3000 rpm it comes back on again to make my car sound like a bloody lorry.

So I tried the viscous out of the other M5 (which was silent all the time) and same thing again! So its not a faulty viscous fan. Means the car is running very very hot.

Coolant level ok, oil level to the max, cant see why its doing this. The temperature needle statys dead in the middle most of the time but does go upto 3/4's sometimes in traffic.

Could it be the thermostat?


Where is it located and is it hard to remove? Or does half the engine have to come out first as usual?
 

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Discussion Starter #5
Thanks for that Phil!

Washer bottle is easy to remove anyway.

Going to find out if I can get one today and fit it.

Thansk again!

PS: any special tools required?
 

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Discussion Starter #8
Its the only thing I can think of thats causing this problem.

Anything other than this can be the head gasket but no other symptoms of head gasket failure are there. No water/oil mixing, no pressurising of the coolant system, no funny smoke out of exhaust.....

Hopefully it will stop sounding like a lorry!

Thanks guys.
 

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Discussion Starter #9
OK, changed thermo stat, nothing wrong with the old one. Car still sounds like a lorry. Once it heats up the viscous fan is almost impossible to shut up unless I rev the bolloxs out of it. As soon as I slow down it comes on again and just wont shut up.

Why is my car running so hot?

Is anyone else experiencing this problem? My fuel economy has gone down the drain once the viscous comes alive.

I'm thinking with all the warm weather coming up its best I remove the thermostat altogether. Sure it will make the car run cold for a bit longer but atleast it wont cook it.

I'm getting worried that this maybe pointing towards a possible head gasket failure because my other M5 doesnt do this.
 

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Cyrus Pal

Get your arse down to your local BMW M5 specialist/Dealer, call Munich Legends, call Munich Motors (Wokingham), get this diagnosed ASAP, running hot ain't good, I ended up with an engine rebuild, Pistons, bearings, recut valves etc, etc, 'cos my engine was running hot/lean. Cost circa £7k:

The fault to my engine was for a number of reasons:

Sump gasket leaking (4 nuts missing)
2 x non return valves burnt out (On the vacuum side/plenum)
2 x nuts missing from rocker cover
Retarded ignition due to worn/stretched timing chain
Various worn/leaking vacuum hoses
Valves out of tolerance


Let me add that the then service manager at 'Bridgegate Derby' Jonathan Davies who carried out my service, didn't pick up any of these faults, nor did they accept any responsibility after performing a 2nd 'Inspection 11' which is, I think the biggest inspection you could have on these cars;

While I'm at it, they didn't change;

Spark Plugs
Gearbox oil
Diff oil
Microfilter
Couldn't confirm valves had been checked after I was told they had been checked.

Told me suspension/steering was fine when both the upper and lower control arms/bushes need replacing, front and back brake discs were warped, various brake wiring looms need replacing, needed to top oil (2ltrs/200 miles) on the way home etc. etc

Engineer left his mobile phone in the car, along with numerous stains on the upholstery.

Munich Motors sorted everything out;

Bridgegate later offered me a free 'Inspection 11' to compensate, which after a long conversation with Jonathan Davies/Service manager (Now Dealer Principal) (I've had BMW's for over 25 years and never seen anything like this!!) I accepted.

Another saga;

They didn't do an 'Inspection 11' (although they stamped the service book as one, paper work indicates 'Inspection 1').

So they couldn't tell if they changed 'V' belts, microfilter, gear/diff oil, checked valves etc, etc.

Jonathan Davies sat there with a blank face, even after all of his wonderful promises, compete a**ehole; To make things worse, as I drove away the engine undershield fell off!! I returned ........... do you know what he said? Nothing to do with us?!

It was an expensive and surreal experience!!

Beware and sorry to 'Hijack your thread', I just didn't want you to go through my experience with an advertised 'BMW M Power' Franchise, they know 'J*ck S**t' about M cars!!

But get the Hot running sorted sharpish!

Brian







Cyrus said:
OK, changed thermo stat, nothing wrong with the old one. Car still sounds like a lorry. Once it heats up the viscous fan is almost impossible to shut up unless I rev the bolloxs out of it. As soon as I slow down it comes on again and just wont shut up.

Why is my car running so hot?

Is anyone else experiencing this problem? My fuel economy has gone down the drain once the viscous comes alive.

I'm thinking with all the warm weather coming up its best I remove the thermostat altogether. Sure it will make the car run cold for a bit longer but atleast it wont cook it.

I'm getting worried that this maybe pointing towards a possible head gasket failure because my other M5 doesnt do this.
 

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A couple of thing's Guy's: 'sounding like a lorry' - maybe I've not read this thread properly, do you mean the thing is pinking all the time ?. Running hot - as in water temp high &/or oil temp high, e.g. both gauges over half way?, lastly - Bridgegate derby, what a right bunch of wank*rs, particularly having all that **** and dealing with the DP, just makes you wonder. Brian do you happen to have a spare undershield, mine fell off last month, managed to get on my return but unscathed it was not.
Hope you get it sorted out Cyrus.
Cheers,
Phil.
 

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Sorry Phil

don't have as spare shield for you.

Had to get a new undershield; Bridgegate said they would supply one free of charge; but ......... you guessed it .......... I had to pay full retail for it, and, they sent the wrong one, so I had to get one from my local dealer at a reasonable price. As I say, it was almost like I was 'Candid Camera'. How can a supposedly professional organisation get it so wrong.

As an after note, I went down the legal route, but the onus was on me to prove I was right, it would have cost the engine rebuild again just to have a 'not enough evidence' verdict brought. It's an impossible thing to prove?




Phlem5 said:
A couple of thing's Guy's: 'sounding like a lorry' - maybe I've not read this thread properly, do you mean the thing is pinking all the time ?. Running hot - as in water temp high &/or oil temp high, e.g. both gauges over half way?, lastly - Bridgegate derby, what a right bunch of wank*rs, particularly having all that **** and dealing with the DP, just makes you wonder. Brian do you happen to have a spare undershield, mine fell off last month, managed to get on my return but unscathed it was not.
Hope you get it sorted out Cyrus.
Cheers,
Phil.
 

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And I was tempted to drive to Bridgegate from Chester just because of their 'M expertise' and reasonable prices!! I'm glad I didn't!!
I paid over £800 last year for an Inspection II at Halliwell Jones Chester and they did a great job.
After ringing every main dealer in a 50 mile radius beforehand only they would do the valve clearances, and they supplied me with the measurements before and after as I requested.
Yes it was very expensive, but I know they did a good job.
Even after the I queried the invoice quoting Castrol SLX 0/30 they replaced it with TWS no questions asked.

The moral of the story is that you probably know more than the main dealer 'technicians' so make sure that they know that and you should get a good job done.

Cheers,
Bryn.
 

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Discussion Starter #14
I cant stand companies who advetise as being M power specialists and know **** all about M cars.

Anyway,

The car is NOT pinking. I know what a viscous fan noise is, Ive been plagued by this noise on e30's aswell.

The temp guage is now not going over half ever (Ive been driving in traffic all day). The engine temp is half way between 120 and 210 and creeps upto one bar away from 210 at the most.

HOwever, Mr fcuking viscous fan wants to stay on all the time unless I keep the engine speed at 4000rpm and then it shuts up after about 10 seconds.

Its doing this in the bloody cold aswell!

I did a small experiment. I sprayed cold water onto the viscous and behold, it shut up totally and no rise in temperatures. It came back after while and pissed me off even more as peopel loked around to see this lorry/M5 coming down the road.

Seeing as car is not actually running hot it means there is some problem with heat getting away from the from of the engine bay. Either Both my vicsous fans are a bit trigger happy or the distance between the rad and fan is a bit less than it should be. Meaning my engine mounts are shagged. The other thing it could be is that the radiator is not getting rid of heat as it should............but that cant be right, car would overheat then.

If I cant solve the problem and temperatures are fine then I'm going to do one of two things:

1) remove Mr wanker viscous fan and fit an electric fan

2) Fit an additional washer jet motor connected to washer bottle and have a it spray directly onto the viscous fan. Will have a button on the inside of the car to do this.

I really hate viscous fans, they are such a **** idea. I had this exact problem on an E30 I used to own. I think im going to buy an electric fan.

Oh, and its unreal how much power you lose when the viscous is fully locked up!

I will be taking my car to Bexley Motor Works next week for valve clearances and an oil change.
 

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Is it a failed 'CLIMATE CAPACITOR/ADDITIONAL BLOWER'

Item 6 at the url: below. I replaced mine because it wasn't working, I'm wondering if yours may have failed in the 'jammed on' position? Just a thought as I don't know enough about it?

http://www.realoem.com/bmw/showparts.do?model=HC92&mospid=47387&prod=19920900&btnr=64_0132&hg=64&fg=55&hl=8&PHPSESSID=3dbbeb3f7f271c0bbb5b8cf882542e26





Cyrus said:
I cant stand companies who advetise as being M power specialists and know **** all about M cars.

Anyway,

The car is NOT pinking. I know what a viscous fan noise is, Ive been plagued by this noise on e30's aswell.

The temp guage is now not going over half ever (Ive been driving in traffic all day). The engine temp is half way between 120 and 210 and creeps upto one bar away from 210 at the most.

HOwever, Mr fcuking viscous fan wants to stay on all the time unless I keep the engine speed at 4000rpm and then it shuts up after about 10 seconds.

Its doing this in the bloody cold aswell!

I did a small experiment. I sprayed cold water onto the viscous and behold, it shut up totally and no rise in temperatures. It came back after while and pissed me off even more as peopel loked around to see this lorry/M5 coming down the road.

Seeing as car is not actually running hot it means there is some problem with heat getting away from the from of the engine bay. Either Both my vicsous fans are a bit trigger happy or the distance between the rad and fan is a bit less than it should be. Meaning my engine mounts are shagged. The other thing it could be is that the radiator is not getting rid of heat as it should............but that cant be right, car would overheat then.

If I cant solve the problem and temperatures are fine then I'm going to do one of two things:

1) remove Mr wanker viscous fan and fit an electric fan

2) Fit an additional washer jet motor connected to washer bottle and have a it spray directly onto the viscous fan. Will have a button on the inside of the car to do this.

I really hate viscous fans, they are such a **** idea. I had this exact problem on an E30 I used to own. I think im going to buy an electric fan.

Oh, and its unreal how much power you lose when the viscous is fully locked up!

I will be taking my car to Bexley Motor Works next week for valve clearances and an oil change.
 

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Here's an excerpt from the Bentley Manual:

The auxiliary (electric) cooling fan provides additional air flow through the radiator when coolant temperature exceeds a predetermined level or whenever the air conditioning is on. The fan assembly is mounted in front of the radiator. A dual range temperature switch is mounted on the right side of the radiator.


Mine didn't come on until I changed the resistor pack. I'm wondering if yours is on all the time?



Cyrus said:
That looks like an electric fan. I diddnt know these cars had electric fans.

SO does this fan stay on all the time?
 

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Discussion Starter #18
I think my auxillary fan isnt working at all! Thats why the rad is getting hottor than normal and hence why the viscous fan is coming on more than it should to bring the temperature down.

This makes perfect sense and this is an easy fix. Thanks for pointing this out!
 

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I think the resistor pack is something like £30 from memory and seems to be a common fault.

Let us know if this was the fault.

Cheers

Brian



Cyrus said:
I think my auxillary fan isnt working at all! Thats why the rad is getting hottor than normal and hence why the viscous fan is coming on more than it should to bring the temperature down.

This makes perfect sense and this is an easy fix. Thanks for pointing this out!
 

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Cyrus,
Did the resistor pack fix your problem? I am having the same **** issue. If so, how did you get to it? Did you remove the radiator or go through the grill? I don't have a Bently manual yet just a P.O.S Chilton.
 
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