Just recently acquired a pretty much stock 1985 pick up with a 22R 5 speed.

The truck run fine on long highway runs (1+ hrs) going 70 75 miles per hour. The temp gauge is a little less than mid way the whole run, but once I start idling or start city driving the temp gauge starts to rise pass the mid way point and sometimes almost to the red. The temp gauge lowers as I get back on the highway. I also have this issue when I do a lot of city stop and go driving.

I recently did an oil change and flushed the coolant and refilled with Toyota red. Seem to help a little in that it doesn't the temp gauge doesn't rise as much and as quickly.

Any input/help would be greatly appreciated.

Thanks.

 

I'd check your thermostat, well, maybe check your fan too. On the highway, all the air goin' thru the rad will keep it cool and once you stop and it starts to get hot it sounds like your not pullin enough air to cool the rad. Now if you fan is working, check over the front of your radiators for being obstructed.

 

Sounds like you fan clutch (fluid coupling) isn't working properly. There is a way to test it, checkout this thread for mor info;

https://www.yotatech.com/forums/f2/f...ild-22r-18900/

 

Thanks...I'll look into all those suggestions.

The truck has original 63K miles on it. Do you guys think it's the fan clutch?

 

The fan clutch tightens up when the air moving through the rad. gets too hot and is what pulls air through the rad. when you are stopped or moving slow. So overheating when stopped or moving slow is typically related to the fan clutch. Make sure the bi-metal coil spring can twist the center stud in the clutch, that is what changes it's internal valving. Mine was stuck once, freed it with a pair of pliers.

 

Sounds like fan clutch to me.

 

Does anyone have the instructions/guide for the fan clutch fluid fix for the 22R?

The slowspeed.com website that had the fix posted appears to be gone.

Thanks for your help.

 

I have it archived on my site:
- http://www.4crawler.com/4x4/Docs/FanClutch.pdf

 

Thanks alot 4Crawler!

 

I was just curious... any disadvantage to ditching the clutch and running the fan at "direct drive"? I had my old Chevy setup that way and I can't think of any hurt caused by going straight from pump to fan. I could care less if it takes longer to warm up.

 

Well, the fan is a power drain on the engine, probably a few HP at high RPM. On a big block Chevy probably not a big deal, but a low power 22R, it probably makes a difference. I know on my '85 I picked up a full MPG after replacing my very tight clutch with a new one that actually freewheeled at speed.

 

Good thread. I'll keep this info in the back of my mind, should this ever happen to me.

How about an electric fan upgrade?

 

I ran an electric fan for a few years but went back to the reliability of the stock fan/clutch.

 

I finally got the time to pull off the fan clutch off my 1985 22R Pickup for service/rebuild. I was experiencing a rise in temperature at idle and determined that the fan clutch maybe the source of my problem.

Please see picture. I think the one I have is a replacement one and not the original OME AISIN one. Am I correct?

If that is the case, is it worth servicing/rebuilding it or should I just get a OME replacement? I read somewhere that the non-OME replacement ones are not very good.

Let me know what you guys think. Thanks for your help.

 

You mean OE- original equipment, OME is Old Man Emu, lol. Here is some info on a good clutch, same one thats on my 84.


Manufacturer- Hayden
P/N- 2554
In stock at CSK or O'Reilly auto parts

Edit--- here ya go---- http://shop.oreillyauto.com/ProductD...pe=176&PTSet=A

 

I put in a new AISIN fan clutch and problem solved. Thanks everyone.