1969 polara noisy engine fan

[polarnj]

nornally the fan basically freewheels when cold and shouldn't make any noise... once it gets hot enough air blowing through the radiator onto it, (180 or so depending on the clutches specs) it will then engage and you'll hear the fan...when there is enough air blowing through the radiator due to the speed of the car, the temp of the water in the radiator will be cool enough for the clutch to disengage and the fan will quiet down...if the engine's running really hot for whatever reason the clutch will remain engaged...so to repeat myself, it should be quiet on cold startup and shouldn't make noise till well after the thermostat opens....issues with the one on my camper showed that Hayden, Murray and 4 Seasons were all the exact same clutches (casting numbers,part #'s, engraved numbers) in different boxes and all came out of the same chinese factory....the third one finally worked

Mine is noisy right from when it's first started. I have no choke so I have to Rev it up a bit when cold, the fan is roaring away right from the start. I did take it for a 20 minute ride and it seemed to go away for a short time, maybe above a certain speed? But then quickly comes back again

 

[Just Carbs]

It can be hot enough under the hood on a hot day for the fan to be engaged for a short time when the engine is started cold before it clears out the hot air and the clutch releases.

 

[polarnj]

It can be hot enough under the hood on a hot day for the fan to be engaged for a short time when the engine is started cold before it clears out the hot air and the clutch releases.

It was in the lower 50s outside, but it is in a garage under a bunch of apartments, so some heat comes out of the pipes in the ceiling I guess.

One other thing, the PO said the radiator has no thermostat at the current time, not sure if that has any effect when it's cold though. I'm working on getting one put in

 

[Just Carbs]

It was in the lower 50s outside, but it is in a garage under a bunch of apartments, so some heat comes out of the pipes in the ceiling I guess.

One other thing, the PO said the radiator has no thermostat at the current time, not sure if that has any effect when it's cold though. I'm working on getting one put in

I've not had one engage on a cold start that wasn't in direct sunlight and more than 80 degrees outside. It Can take more than a minute to cool the clutch thermostat and release.


The exception is a few that need to distribute the heavy fluid that has settled to the bottom of the clutch. Maybe 30 seconds or less to release? I don't see that happen often or with many clutches. Maybe it's just the purely centrifugal clutches that do that?

 

[volksworld]

I'd suspect that the lack of thermostat and the current fan clutch might be band aids for some other overheating problem

 

[polarnj]

I'd suspect that the lack of thermostat and the current fan clutch might be band aids for some other overheating problem

I was thinking the same thing. It doesn't have any overheating issues now, but then again with no stat and that crazy fan it doesn't go up very much at all