New electric fans on the 300GEL
I have fitted twin 12" Pacet pullers. Controlled by an adjustable thermostat
So far, cooling has been very effective, hills, towing , load etc. I am very glad to be free from the viscous clutch problems.
Will send some pix soon.
I have fitted twin 12" Pacet pullers. Controlled by an adjustable thermostat
So far, cooling has been very effective, hills, towing , load etc. I am very glad to be free from the viscous clutch problems.
Will send some pix soon.
What is the Pacet reference? Send those pics, please!
Any noticble improvement in mpg? More revvy?
As I said before, my belt run fan was locked in place, so, compared to that I am saving about 15-20%
would be ınterestıng to know what savıngs you wıll be makıng over the course of the next few weeks...bearing in mind the ac working much harder!
keep us posted shakir.
These pacets are doing a fantastic job, here are some pixs.
it is a tight fit
but tolerences are more than enough
I have just been mucking about with a set of standard electric fans from a 2000 300gdt. They are 12" and fit horizontally across the front of the radiator not behind as you have done. Did you have a reason for putting them behind?
a/c parts in front of the radiator will not permit 2 fans installed there.
As said above plus A/C fan occupies the whole front. And front fan also is there to give emergency cooling if the main one fails. My 1st electric fan trial was with a 16" on my 280. But this set up is better.
G-Wagen Owners Association › GWOA Forums › G Technical Forums › General Technical › is this the end of my cooling dilema?
I didn't realise that you also had an electric fan infront.
The 500 has 2 x 12" infront only and the same size radiator as the 300, so there should be no reason that the air movement is insufficient. Any cooling problems are likely to be radiator blockage
No aircon in your 500 then.
Yes it has a/c, but it's designed to have twin electric fans so everything fits ok
So 2 electric fans for the aircon and the engine cooling. May be they didnot put fans for the aircon but performance will suffer. Are sure nothing is amis there? Probably you had viscose fan for the engine but someone removed it. Believe me those 2x fans will not be enough under load.
:oops: :oops: Sorry there is a great big viscous fan sitting behind also :oops: :oops:
Thanks for that!
Your 2x electric fans are for the aircon, and emergency cooling as a back up. My fans replace the viscous fan.
This seemed the most appropriate chain I hope so..........
On my 300 463 [I don't think modified in any way], I have two electric fans in front of my radiator. Presume they are the ancillary fans people are talking about? Maybe they support the air conditioning too.
After a complete cooling system [and head] refurbish the car is running well and temperature needle sits beautifully just above the 90 almost all the time - while running along at 60/70 or sitting in traffic with the a/c on. Very pleased with the result. Initially caused by a ruptured oil cooler/heat exchanger in the radiator. Eventually the engine was being cooled [not cooled!] by what looked like pink toothpaste........ Many flushes later and new water pump, radiator, thermostat and many, many more flushes, things are going well.
I have a question about when I stop after a journey.
I have also replaced the 3 x sensors on the head - see photo [I think also a vacuum measure also to the left of the head on the photo [front-most on the vehicle] . When I first had the vehicle, I seem to remember that after I had stopped to park, sometimes the electric fans started up as the temperature climbed - as it does when the circulation stops. This happened automatically. I've realised it isn't happening any more - so am presuming that one of the sensors is not wired correctly or routed correctly. If I leave the ignition on, then when the temp passes over 100, the fans come on.
I'm going to ask an auto electrician, as this is beyond me. My questions:
1] Am I correct that the fans should come on once parked and journey completed? [obviously they'd also come on if temp reached that level as I was driving]
2] Is it the part indicated as "switch" in my PDF that activates the fan? MA 008 542 32 17?
3] Any pointers to which Relay it is?
4] Grateful for any tips - which I'll pass onto an auto electrician along with the wiring diagrams from the ever-useful 463 service manual that I have courtesy of ever-helpful GWOA!
Any heads-up much appreciated. Thanks. Alastair.
Hello Alastair,
I do not have much broad band time to go into detail at this moment but from all the work you have done i.e the head, new water pump, new radiator and several flushes your coolant temperature should be steady at 85°C that is on the top part of digit '8' which I think as you put it is 90°C. But you should be getting this reading whilst on the move or in short term traffic. If your temperature drops whilst on the move; this suggests a blockage in the radiator. Check for cool spots on the radiator surface after a good run and engine switched off. Do have the correct radiator pressure cap and have you renewed the thermostat?
Is your air conditioning efficient? The two fans are for air conditioning but I think the fans do not ordinarily come on after you switch off but I am not 100% sure on this, perhaps Arnie could help, I suspect the air conditioner needs gassing. The fans coming on past 100°C is correct function of the fans engaging.
You may phone me on Mbl: 07925931152.
... Eventually the engine was being cooled [not cooled!] by what looked like pink toothpaste........
If your G is an Automatic, the 'pink' bit is most likely due to the red dye in the transmission fluid. If that is the case, I hope that you also flushed the transmission, as it won't be happy for long running with water.
I think, from memory, that is is normal for the electric fans to run with the ignition off, as they do in most other cars.
The electric fan(s) should be on constantly, if the A/C is on, or otherwise, when the head temperature reaches 100C.
(If the cooling system is in good order, the temperature should only go above 100 very rarely, on the hottest days. Not yet got to that point this year on my G300. Check you have no trapped air in the system.)
Thanks both. Very helpful.
I've flushed everything. The "pink" was from the red radiator coolant. Thanks for the heads up on the transmission fluid Arnie. Checked that an all levels good - with no water ingress. Aircon gas changed to R134 a while back and all topped up with 1.07kg of gas. That works perfectly too.
You've answered my question about the fan coming on automatically. I agree. Most normal [modern] cars do that - although I accept that a G is not "normal" and mine certainly isn't modern!
So back to my "switch" question.
1] Is the cylinder head sensor the MA 008 542 32 17 that I show in my PDF? But which one is that in my photo?
2] And any advice on which relay controls that. I just want my cooling to be as near perfect as possible. I don't want the long slow degradation to start all over again now that I've sorted things.
My fuel consumption has improved markedly since the engine is running at the right temperature too.
As I said earlier, we're a helpful lot at the GWOA. My son and I had a chuckle this weekend [my wife just smiled wryly and lovingly] when we were trying to convince her that we find an Audi A2 for her to replace an old Golf.......... We headed to Google, of course..... Her immediate reaction was that you couldn't possibly have two cars intended for daily use in the same family that both have an "Owners' Association" ;-) My wife loves the G, but understand her preference for having at least one "normal" car to ensure family harmony.
Alastair.
Be careful using pink / red OAT coolant. It should be the G48 / G05 version (blue/green/yellow) for your car. The pink stuff will eat away at certain gaskets and o-rings and can cause precipitation in the coolant. It wouldn't have helped your failed radiator.
The 4-pin sensor (shown broken in your picture) is for the engine control unit and to operate the cold-start mechanism. I think the middle sensor, with a single wire, operates the fan relay. If you have the G-Wagen Service Manual, there is a wiring diagram in there. (check PM).
Thanks very much.
I do have the Manual - printed and bound. Agree. The best £30 you could spend at Prontaprint!
And thanks for the coolant heads up too.
I'll let you know how I get on.
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Pacet ref is PF1211B/2. You have to fit them diagonally starting from upperleft corner.