Emergency radiator fan - D1

So the fan on my D1 failed. Close examination shows material fatigue around an air bubble inside the plastic.

So I went looking for a temporary fan to run until either replacing the broken one or adding electric fans.

Since I live in the boonies (SE AZ about 5 miles from Mexico) the closest Rover anything is my truck. Dealer is 90 miles away. So I took the broken fan to the local salvage yard and came away with a clutch and fan from an S10. The S10 fan is used on many 4.3l V6 GM vehicles. It is an 11 blade fan as well. Dorman makes a replacement 620-602 and VDO - Cooling Fan Blade - Part # FA70377. About $40 new (saw one for $24 on Summit Racing), $15 or so at the salvage yard.

It uses the same fan clutch referenced in other threads. The fan is larger and a bit heavier. It is plain glass reinforced nylon. So I popped the clips off the shroud and pulled that out then installed the S10 clutch and fan. Initial impression is that is moves more air at lower RPM and seems to freewheel easily as the RPMs build. That seems good so there isn't a huge difference in load on the pump bearings. Once the clutch actuates the airflow is noticeably more than the OEM fan but not much more noise.

I suppose that since a replacement can be had for $30 these days it is possible to keep one on hand for a trail fix but if you find yourself without a spare and surrounded by GM parts it would make a nice temporary repair.
 
Last edited:
Here you can see the fitment:

thm_IMAG0180.jpg
thm_IMAG0183.jpg
 
Follow up...

Fitment -
* Clearance: The fan does run within 1/2-3/4 inch of the transmission cooler line. The motor mounts are good so there is no immediate threat but I will watch for abrasion or contact. If it does contact the plastic cover on the line it may be necessary to trim the blades just a bit. So far no problems.

* Shroud: I have not yet trimmed the shroud to fit. The new fan runs at 2 inches clearance to the radiator. Also given the proximity to the transmission lines most of the shroud would be cut away to fit. I may look at a custom partial shroud on each end or buy a spare to carve up.

Operation -
* Temp: An obvious difference. I still need to pull the logs from Torque Pro for graphing but the observed temp difference was 5-8 deg F for idle and town driving w/o AC. With AC running the idle temps was ~15F lower. Town with AC averaged 10-12F lower. Carr Canyon trail is open again so I'll try to take a drive up to see how it performs in a climb w/wo AC.

* Clutch: The cycling continues to be acceptable. The fan largely freewheels up to ~200F at which point the engagement quickly progresses. Once the temp is back down close to 190 the fan begins to freewheel again.

I am happy enough with the Chevy clutch and fan that I didn't order an OEM fan this week. I'll probably pick up an S10 spare.
 
Last edited: