Gain extra benefits by becoming a Supporting Member Click here find out how!
Classic Performance Products Classic Parts
Ciadella InteriorsAmerican Auto Wire Classic Industries
Chevs of the 40sDanchuk Catalog
Hellwig Products IncPerformance Rod & CustomEcklers AutoMotive
Nu-Relics Power Windows
Impala Bob's Bob's Chevy Trucks Bob's Chevelle Parts Bob's Classic Chevy

Join the Community today







Username Post: Mech Fan drive belt (not accessory) tensioner        (Topic#341596)
Highlander1 
"5th Year" Silver Supporting Member
Posts: 1697
Highlander1
Loc: SE North Carolina
Reg: 08-19-04
01-01-17 02:42 AM - Post#2668800    


The tensioner for the fan belt drive was wobbling and squealing so I removed it. Since this was the mechanical fan I am still able to get around on the single electric fan (thank goodness, I guess, that it is winter). However, would not want to get caught in traffic or, later, summer heat.

Guess what?, There is not a single one in the GM dealer parts system (PN 10186118) and, to the best that I can tell, there is no aftermarket version: http://www.tonkinonlineparts.com/p/__/TENSIONER-En...

If anyone knows a solution to this problem I would appreciate it. Is there a rebuilding service for them? I am guessing that the bushing/bearing could be replaced but (also) in mine the spring that provides the tension pressure is also shot. I need the complete unit.

A while back I submitted a post about installing a second (passenger side) electric fan. This now has become more than "just wondering." Any thoughts on this?

Is anyone familiar with the wiring harness for the two fan version? Do they run simultaneously or independently from each other? Is it a simple matter of splicing the passenger side fan into the wiring harness for the driver's side? Any help, insight or experiences here will be appreciated. Regards, Don



 




patgizz 
Senior Moderator
Posts: 8588
patgizz
Loc: Cleveland, OH
Reg: 01-30-00
01-01-17 05:38 PM - Post#2668905    
    In response to Highlander1

the fans run independent of each other. the primary kicks in at X temp and the secondary kicks in at Y(higher) temp or whenever the AC is running.

in my 95 impala i have them wired to both function together and have no issues with it. i have separate relays for both that get their signal from the the same temp sensor.





 
fbi9c1 
Frequent Contributor
Posts: 1921

Loc: Los Angeles
Reg: 08-07-07
01-01-17 09:48 PM - Post#2668928    
    In response to patgizz

Go pull a dual fan setup at a wrecking yard from a 9c1 or station wagon.. The tensionser for the mech fan was discontinued at least a couple of years ago. Take the relay box for the fans as well. IIRC the PCM is already programmed for the dual fans even though your car didn't have them. Do not wire them together.
If the car in the reply above was really a 95 ImpalaSS, it would have had a proper dual fan setup in place and not been rigged as this person has done. He clearly doesn't understand how the system works. Of course they run of the same CTS. The PCM controls them, not the CTS, FYI.
The turn-on, turn-off temps are critical to operation. Go to the impalassforum.com and find out about re-programming your PCM for lower than stock fan turn on temps. the stock programing is way too hot.

Jim B.


 
Highlander1 
"5th Year" Silver Supporting Member
Posts: 1697
Highlander1
Loc: SE North Carolina
Reg: 08-19-04
02-09-17 03:22 PM - Post#2676021    
    In response to fbi9c1

Pat/Jim: Thanks for your responses!

Well, I have searched all over the internet, made a lot of calls and walked several local yards, That tensioner is not to be found. I did, however, find several dual electric fan setups-although not from 9C1s or wagons. Will this make a difference? I also noted that whereas my fan is connected to the driver's side wiring harness the dual fan setups are connected to a passenger side harness with an extension over to the driver's side fan.

Jim, can I use either just the passenger side fan with the connection over to the driver's side fan (preferred due to costs) or the dual fans? Since you noted that my PCM is already programmed for dual fans can I assume that the wiring harnesses will match (did not pay that much attention in the yards as at the time was still looking for the dang tensioner- at least they are not far from here).

You will need to help me out on reprogramming for lower turn on temps -- but first I will need to know what the abbreviations IIRC and CTS stand for. Also, and unless its pretty apparent when I get in there, where do I need to look for the fan relay box?


Incidentally, drove car yesterday about 100 miles out of town and had no issues until about three miles from home. However, in coming back into town you hit about 28 traffic lights over the last five miles as it was the afternoon rush hour. Although it never got into the red, and not really close, the needle did get about three quarters to the right where as it normally runs just slightly left of straight up (incidentally, its a new Stant 180 degrees thermostat, as well as new pump, hoses and radiator). I mention the thermostat as there have been times, although not yesterday, where it runs right up against the red and then falls back down as if it has been shot.

Gotta go now but will follow up on your advice about the Impala SS forum first chance I get.

Thanks,

Don



 
Highlander1 
"5th Year" Silver Supporting Member
Posts: 1697
Highlander1
Loc: SE North Carolina
Reg: 08-19-04
02-18-17 01:25 PM - Post#2677285    
    In response to Highlander1

Jim, could not get on the Impala SS forum (I went there years ago and do not recall my name but it recognizes my email address and they do not match). However, found one for B body wagons GM Long Roof http://gmlongroof.4umer.com that had exactly what I was looking for: http://gmlongroof.4umer.com/t57-mechanical-fan-de l...

Original poster has a great step by step "how-to" on wiring in the second electric fan. However, another posted referenced a website for a guy who makes custom harnesses, complete with relays and fuses, for this application. Don't know what the total costs of the required parts are, and the custom harness is around $150, but to be able to get a purpose specific harness out of the box is pretty good.

Of course, its amazing that due to the unavailability of a $35-$40 part one must spend $150 plus the costs of the junk yard parts (you can buy the fan and bracket new and pay even more).

A couple of observations from this thread.

1. One poster (Vic) states that his car cools fine on just the single electric fan.

2. Regardless of either one or two electric fans, and as you noted, they come in too late and the ECM must be reprogrammed.

As my car, running on a single electric fan, tends to overheat in traffic (and its not even close to summer) I wonder if what I need to try first is the ECM reprogram because as I have noted my car can be heating up and the fan does not come on until its about in the red. I emailed Gary (the guy that makes the harnesses) about reprogramming and he said that it can either be done with a laptop and program or a hand held programmer so I will need to do some more research here.

Since they are not making the fan tensioner anymore it may be that in the future there will be others on this forum looking for answers so I plan to post a topic specific link to this information.

Thanks for your input!

Don

One more observation: These cars (HD cooling) had two transmission coolers. One in the radiator and one external mounted in front of the passenger side mechanical fan - which always operates. So the question comes to mind, how important is is for this cooler to always be exposed to a moving air current (which would not be the case with a second electric fan)? Did the external trans cooler and mechanical fan just happen to wind up on the same side or was this configuration done with a purpose in mind?




 
Highlander1 
"5th Year" Silver Supporting Member
Posts: 1697
Highlander1
Loc: SE North Carolina
Reg: 08-19-04
02-19-17 01:11 PM - Post#2677474    
    In response to Highlander1

Regarding ECM reprogramming, my thinking is that the new electric fan, which is taking the place of the primary (mechanical) fan, should kick in at normal operating range, or 180 degrees. Am I good on this? Thanks, Don



 
Highlander1 
"5th Year" Silver Supporting Member
Posts: 1697
Highlander1
Loc: SE North Carolina
Reg: 08-19-04
02-20-17 11:16 AM - Post#2677634    
    In response to Highlander1

Have just been educated on this over on the GM Long Roof Forum. Fan cut in temp needs to be higher than thermostat temp (or else fan would not cut off until engine was turned off). Since my thermostat is 180 degrees I will probably go with 190.

If you want/need to replace your mechanical fan with a second electric fan here is the link for the custom built wiring harness: www.innovativewiring.com  

Regards, Don



 
patgizz 
Senior Moderator
Posts: 8588
patgizz
Loc: Cleveland, OH
Reg: 01-30-00
03-12-17 10:39 AM - Post#2681072    
    In response to Highlander1

glad you got a reply over there. i had to refrain from replying further here to overcome the desire to tear into fbi9c1 for his arrogance and ignorance of other people's situations.



 
Highlander1 
"5th Year" Silver Supporting Member
Posts: 1697
Highlander1
Loc: SE North Carolina
Reg: 08-19-04
08-14-17 04:26 AM - Post#2704063    
    In response to patgizz

patgizz: "i have separate relays for both that get their signal from the the same temp sensor."

Good point. Thanks. I was wondering if I could hook up a second relay to the same sensor. Is your sensor driver/front or passenger/rear?



 




Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

3352 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.414 seconds.   Total Queries: 17   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 05:04 AM
Top