Fan clutch issues? W/ Video
12-01-2014, 07:59 PM
#1
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1987 Mercedes 300d M603
Fan clutch issues? W/ Video
I am overhauling the cooling system on my 1987 Mercedes 300d M603 and I wanted to make sure that my fan clutch is not about to go out (or already has) since it is the original. I know it is the original because it has the aluminum fan.
The car runs at 90 C pretty much consistently, and gets close to 100 C when driving it hard or going up steep mountain hills. I researched a ton on how to diagnose the fan clutch, but I am still stumped; so I posted two videos here to see if any one could quickly help me out.
In video one, I run the car until it is at about 95 C (you can see in the video), and then manually shut off the engine to see if the fan stops quickly, which it does not. It seems to turn freely, and turns freely right afterwards.
Here is the link:
In the second video, I run into a store quickly and come back out 1 minutes later and spin the fan...It has more resistance than in the first video when I spun the fan right after shut off. Is this a sign that everything is normal, or should I maybe replace the fan?
Here's the link:
Thanks for your help! I love this car and I know I have to keep my cooling system in tip-top shape since I have the infamous #14 head.
Overall, does the fan clutch seem fine, or does it look like it's on its way out? Thanks!
The car runs at 90 C pretty much consistently, and gets close to 100 C when driving it hard or going up steep mountain hills. I researched a ton on how to diagnose the fan clutch, but I am still stumped; so I posted two videos here to see if any one could quickly help me out.
In video one, I run the car until it is at about 95 C (you can see in the video), and then manually shut off the engine to see if the fan stops quickly, which it does not. It seems to turn freely, and turns freely right afterwards.
Here is the link:
In the second video, I run into a store quickly and come back out 1 minutes later and spin the fan...It has more resistance than in the first video when I spun the fan right after shut off. Is this a sign that everything is normal, or should I maybe replace the fan?
Here's the link:
Thanks for your help! I love this car and I know I have to keep my cooling system in tip-top shape since I have the infamous #14 head.
Overall, does the fan clutch seem fine, or does it look like it's on its way out? Thanks!
Last edited by kelley312c1; 12-01-2014 at 08:41 PM.
12-02-2014, 05:57 PM
#2
Out Of Control!!
FYI your thermostat starts to open at between 83-87 C with full open at 94C
FYI your coolant cap opens at 1.4bar and with the standard anti freeze that would be 129C for protection down to -30C
FYI your coolant cap opens at 1.4bar and with the standard anti freeze that would be 129C for protection down to -30C
Last edited by Plutoe; 12-03-2014 at 03:00 PM.
01-11-2015, 11:19 AM
#3
Super Member
info
Kelley you can do an easy check on your viscose fan , by pushing in a rolled up newspaper. If it stops then the fan is no good and will need replacing.Be carefull in doing this check. This is for manual type viscose fan and not to be done with the electronic type. You can tell the one from the other as electronic as wires going to it.
01-17-2015, 10:38 AM
#4
Super Member
[QUOTE=kelley312c1;6249287]I am overhauling the cooling system on my 1987 Mercedes 300d M603 and I wanted to make sure that my fan clutch is not about to go out (or already has) since it is the original. I know it is the original because it has the aluminum fan.
The car runs at 90 C pretty much consistently, and gets close to 100 C when driving it hard or going up steep mountain hills. I researched a ton on how to diagnose the fan clutch, but I am still stumped; so I posted two videos here to see if any one could quickly help me out.
In video one, I run the car until it is at about 95 C (you can see in the video), and then manually shut off the engine to see if the fan stops quickly, which it does not. It seems to turn freely, and turns freely right afterwards.
Here is the link:
In the second video, I run into a store quickly and come back out 1 minutes later and spin the fan...It has more resistance than in the first video when I spun the fan right after shut off. Is this a sign that everything is normal, or should I maybe replace the fan?
Here's the link:
Thanks for your help! I love this car and I know I have to keep my cooling system in tip-top shape since I have the infamous #14 head.
Overall, does the fan clutch seem fine, DID YOU DO THE TEST WITH A PIECE OF ROLLED UP NEWSPAPER. LIKE I TOLD YOU TO.
The car runs at 90 C pretty much consistently, and gets close to 100 C when driving it hard or going up steep mountain hills. I researched a ton on how to diagnose the fan clutch, but I am still stumped; so I posted two videos here to see if any one could quickly help me out.
In video one, I run the car until it is at about 95 C (you can see in the video), and then manually shut off the engine to see if the fan stops quickly, which it does not. It seems to turn freely, and turns freely right afterwards.
Here is the link:
In the second video, I run into a store quickly and come back out 1 minutes later and spin the fan...It has more resistance than in the first video when I spun the fan right after shut off. Is this a sign that everything is normal, or should I maybe replace the fan?
Here's the link:
Thanks for your help! I love this car and I know I have to keep my cooling system in tip-top shape since I have the infamous #14 head.
Overall, does the fan clutch seem fine, DID YOU DO THE TEST WITH A PIECE OF ROLLED UP NEWSPAPER. LIKE I TOLD YOU TO.
01-17-2015, 10:41 AM
#5
Super Member
nfp
Start your car get it warm ,then stick in the fan a piece of rolled up paper .And if you can stop it with the paper its shot. Mind you hand
