A/C not working in "HI" setting 91 FJ80

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Cyril Jeff

Cyril Jeff

10 Year 15 Year
Joined
Mar 15, 2010
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Hello there!
Did a bit of searching and have not found any previous Mudders with a similar problem...

A/C works fine in all settings, but "hi", when switched to hi the air flow seems to go back to low, have replaced my control unit and still no dice, any ideas?

my next plan is to replace the "Hi Relay" behind the glvoe box...

Anyone else have this problem?

thanks! :cool:
 
I have this problem too, but haven't had the chance to look into it yet. Post back what you find about the relay and how difficult it was to get to. Mine runs while on high under 95 degree temps. Over that it will work for a minute and shut down to run on low. When it's really hot out (105+) it just plain doesn't work.
 
I also have a problem with the Hi button staying depressed. All of the other fan settings run cold AC all day, I suspect my fan Hi switch has a mechanical problem but haven't investigated.
 
My guess would be the coil, that controls high, in the blower motor resistor has broke

generic_AIR_527.JPG


Don't know about your sticky button...
 
jonheld said:
High speed fan bypasses the blower motor resistor according to the EWD.
Click to expand...

There is a separate relay for the high speed fan setting on the early 80 series. It's called the blower high relay, located in the left kick panel. I replaced mine 8 years ago, and it is now starting to act up again. The resistor has no bearing on high speed fan operation.
 
motorsargeT said:
There is a separate relay for the high speed fan setting on the early 80 series. It's called the blower high relay, located in the left kick panel. I replaced mine 8 years ago, and it is now starting to act up again. The resistor has no bearing on high speed fan operation.
Click to expand...

X2 on this. I had the same problem. Make sure you replace the relay with an OEM, not the Chinese replacements.:eek:
 
Just did this on my 91. It is easy:

  1. Removel the dead pedal on the drivers side.
  2. Remove the kick pannel on the drivers side.
  3. You will see a block of relays behind the kick pannel. If I remember correctly it is the top right relay when you are looking at the block of them. Most of the relays are the same part numbers as I remember. Has "release" tabs on two sides of the relay. Pull it out and pop a new one in. Mine has been working fine ever since. Whole job took about 15 minutes.
I think it cost abt $10 for the relay at my local Toyota dealer and they had it in stock. Hope this helps.
 
awesome, thanks for the replies Mudders!
I was under the impression that the relay was the one the FSM shows behind the glovebox, referred to as the "HI Relay", I will check for the the block under the kick panel.

Thank again for all the posts, I will report back! :D
 
Last edited:
What was the Part Number for that? My toyota dealer's parts manager looked at me like i was a complete retard when i told her where it is... apparently there's 2 different ones....
 
Appolyon said:
What was the Part Number for that? My toyota dealer's parts manager looked at me like i was a complete retard when i told her where it is... apparently there's 2 different ones....
Click to expand...

58192-60020 Footrest, Front Floor
 
I guess i should have been more specific....

What's the part number for the relay that controls the HI level on the fan? I really don't want to mess with the rusted bolt until it's immediately necessary.....
 
Just as an FYI - my local Toyota dealership didn't have any of these in inventory , the could have had it for me Wednesday, but, me being impatient went to O-Riley to get one - the aftermarket Denso relay was $32.00. Next time I will wait on a factory one. Good side, I now have all speeds of my blower.
Now to figure out whats going on w the AC before it gets too hot. LOL
 
This relay is exchangeable with the EFI relay on these trucks. I picked up 6 of these (used) on ebay for about $4 each. My truck also has a spot to store a spare relay in the fuse box under the hood. It's nice to know that you can pull the fan relay if your EFI goes out on the trail.
 
remac226 said:
Just did this on my 91. It is easy:

  1. Removel the dead pedal on the drivers side.
  2. Remove the kick pannel on the drivers side.
  3. You will see a block of relays behind the kick pannel. If I remember correctly it is the top right relay when you are looking at the block of them. Most of the relays are the same part numbers as I remember. Has "release" tabs on two sides of the relay. Pull it out and pop a new one in. Mine has been working fine ever since. Whole job took about 15 minutes.
I think it cost abt $10 for the relay at my local Toyota dealer and they had it in stock. Hope this helps.
Click to expand...


Saved my ass in this Texas summer heat! Thanks remac!
 
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