Overheating

Farzad Arjmand

Farzad Arjmand

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san francisco
Hello every one ,,, I am new owner of 73 3.0CSI imported from Netherland , car over heats in the city not on highway , I removed the thermostat and problem not solved , radiator looks new ,fan runs but seems to be slow ,, is it water pump ?? belt is tight , any Ideas ?? thanks a bunch . Farzad
 

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Is your fan clutch working? You have the original friction set up. With the engine hot, can you turn the fan by hand? If no resistance then your fan clutch is kaput. Many of us have upgraded to the 9 blade/modern clutch setup. Another option is to do what they say in the blue book, remove 2 of the 4 fan bolts (opposits sides) and replace with longer ones to lock the fan in place to see if that solves your problem.
 
Hi Farzad, the first thing you did already. Thermostat. Water pump is close to not possible due to it´s made based on metal.
Next thing would be the fan / the thermo clutch which "switches" it on in case engine temp ist too high.
If the engine temp is high, you should have reasonable resistence when you turn the fan by hand (engine off ;))
 
wilies13 said:
Hi Farzad, the first thing you did already. Thermostat. Water pump is close to not possible due to it´s made based on metal.
Next thing would be the fan / the thermo clutch which "switches" it on in case engine temp ist too high.
If the engine temp is high, you should have reasonable resistence when you turn the fan by hand (engine off ;))
Click to expand...
I didn't check the fan when it was hot .... I am going to do Steve's suggestion ... I am waiting for new water pump to do it all at once ...I don't think its the water pump ... I have no idea about thermo clutch .... I know that fan operates when engine running .... but looks slow.
 
wilies13 said:
Hi Farzad, the first thing you did already. Thermostat. Water pump is close to not possible due to it´s made based on metal.
Next thing would be the fan / the thermo clutch which "switches" it on in case engine temp ist too high.
If the engine temp is high, you should have reasonable resistence when you turn the fan by hand (engine off ;))
Click to expand...
Thank you ... fan turns free in one direction but not the other way ... I will do the bolts as you suggest ,, lets see if it solves the problem .
 
Hi Farzad,
I chased similar problem in my E23. I checked all the sensors, t-stat, flushed the radiator - no improvement. Then I realized I had 30 years of stuff caked up between the AC condenser and the radiator. These are sandwiched together and the trapped material was blocking airflow to and through the radiator.
Unbolt the radiator, without having to disconnect hose or drain, tilt back and away from condenser, and power spray all the leaves, dirts, grime away. Easy!
After that I was running cool again - and no longer worried about overheating in heavy traffic.
 
How it’s done..

With temp gauge at 3:00 or higher-
leave the engine running and grab a towel.
on the passenger side stick the towel into the fan blades keeping your hand steady.
let us know what happens...
 
sfdon said:
How it’s done..

With temp gauge at 3:00 or higher-
leave the engine running and grab a towel.
on the passenger side stick the towel into the fan blades keeping your hand steady.
let us know what happens...
Click to expand...
That sounds like a recipe to remove fingers...but I guess that has never happened...
 
I removed my E3 mechanical fan about 10 years ago and use a simple pusher setup in front of the radiator. I didn't like the noise of the fan at all times. I have an aluminum radiator and the fan is controlled by a BMW dual section 90°/99° switch and a Volvo fan relay.
 
coupesport said:
Hi Farzad,
I chased similar problem in my E23. I checked all the sensors, t-stat, flushed the radiator - no improvement. Then I realized I had 30 years of stuff caked up between the AC condenser and the radiator. These are sandwiched together and the trapped material was blocking airflow to and through the radiator.
Unbolt the radiator, without having to disconnect hose or drain, tilt back and away from condenser, and power spray all the leaves, dirts, grime away. Easy!
After that I was running cool again - and no longer worried about overheating in heavy traffic.
Click to expand...
Thank you
coupesport said:
Hi Farzad,
I chased similar problem in my E23. I checked all the sensors, t-stat, flushed the radiator - no improvement. Then I realized I had 30 years of stuff caked up between the AC condenser and the radiator. These are sandwiched together and the trapped material was blocking airflow to and through the radiator.
Unbolt the radiator, without having to disconnect hose or drain, tilt back and away from condenser, and power spray all the leaves, dirts, grime away. Easy!
After that I was running cool again - and no longer worried about overheating in heavy traffic.
Click to expand...
sfdon said:
How it’s done..

With temp gauge at 3:00 or higher-
leave the engine running and grab a towel.
on the passenger side stick the towel into the fan blades keeping your hand steady.
let us know what happens...
Click to expand...
Wow ... I will try it this week end ...
 
Mike Goble said:
I removed my E3 mechanical fan about 10 years ago and use a simple pusher setup in front of the radiator. I didn't like the noise of the fan at all times. I have an aluminum radiator and the fan is controlled by a BMW dual section 90°/99° switch and a Volvo fan relay.
Click to expand...
Thank you Mike ,,,, but I like to keep it original ,,no electric fans
 
coupesport said:
Hi Farzad,
I chased similar problem in my E23. I checked all the sensors, t-stat, flushed the radiator - no improvement. Then I realized I had 30 years of stuff caked up between the AC condenser and the radiator. These are sandwiched together and the trapped material was blocking airflow to and through the radiator.
Unbolt the radiator, without having to disconnect hose or drain, tilt back and away from condenser, and power spray all the leaves, dirts, grime away. Easy!
After that I was running cool again - and no longer worried about overheating in heavy traffic.
Click to expand...
Thank you for the your post ,,, radiator and engine bay looks very clean .... I checked the radiator already ..
 
I know a lot of guys do not like the original fan clutch set up but you can shim the thermo coupling inside the fan clutch to make the fan lock on when it gets hotter If you want to keep it original We used todo it at the dealership all the time, still do it from time to time I can explain it if anyone is interested Guess I am still old school, well, I certainly feel it these days

Thanks, Rick
 
Am I wrong to assume that the current setup based on the pictures is original and without a fan clutch? Fan does not look like a nine or eight blade.

If so, that set up should be upgraded, like in most of the coupes.
Also, I have been told that removal of thermostat is a wrong thing to do in any situation.
 
stphers said:
I know a lot of guys do not like the original fan clutch set up but you can shim the thermo coupling inside the fan clutch to make the fan lock on when it gets hotter If you want to keep it original We used todo it at the dealership all the time, still do it from time to time I can explain it if anyone is interested Guess I am still old school, well, I certainly feel it these days

Thanks, Rick
Click to expand...

I would like to have you explain this!
 
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