Cooling Mod - A/C Pressure Switch Bypass

[simo]

1. Purchase the GM weather pack 3 Pin connector, three female pins, three cavity plugs and some 14-16 gauge wire. I got mine from NAPA.
   
   
   
   
   
   
   
2. Cut the ends of the cavity plugs.
   
   
   
3. Cut two pieces of wire about three to four inches long. Strip both ends of each wire. Crimp one female pin to one end of each wire. These pins will be used for the outer ends of the connector. Crimp the two remaining wire ends to the last female pin. This pin will be used as the center of the connector.
4. Insert each of the female pins into the skinny end of the cavity plug. The skinny end goes over the wire crimp area.
5. The connector itself is keyed on each of the outer ends of the connector and you need to use a 1/4 inch drill bit to remove the plastic keys in those two spots.
6. Insert the female pin with the two wires into the center connector through the back side of the connector.
7. Insert the remaining two female pins into the outer ends of the connector through the back side of the connector.
8. Fold over the plastic shell of the connector to lock it into place, be careful not to pinch the two wires coming out of the center connector.
9. Final Product.
   
   
   
10. Remove the connector off of the A/C Pressure Switch.
    
    
    
    
    
    
    
11. Insert your new connector mod into the A/C Pressure Switch harness.
    
    
    
12. Secure the harness with a tie wrap away from the headers and turbo.
13. Turn your ignition switch on and now both of your fans will always run and keep your beast running COOL without the need to have your AC on.
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[Quiky One]

Great post.

Thanks for sharing!

 

[Jan Larsson]

Nice one Simo, thanks for sharing.

What I did on mine was to install a switch in my ashtray to just ground the dk green/yellow wire from the pressure switch to activate the delay relay for the high speed fan. Works well for me and I can turn it on / off as I like.

 

[simo]

Nice one Simo, thanks for sharing.

What I did on mine was to install a switch in my ashtray to just ground the dk green/yellow wire from the pressure switch to activate the delay relay for the high speed fan. Works well for me and I can turn it on / off as I like.

Jan,
Did you just splice into the wire between the delay relay diode and coolant fan temperature switch so that the delay circuit still works as designed at the high temp set point?

Either of these mods work well if you do not have your A/C charged as it allows you to run the high speed fan.
Since I live in the hot desert I want my fan to run all the time at least in the summer heat. I may add a switch at a later date to control the high speed fan.
I just had my A/C recharged with R12 and wish I had done the mod when I first got the car.

 

[PhillyTurboSix]

Good post Simo! Jan do you think you could so something like this with your mod as well? Pictures,description, etc?? I'll sticky this and keep it up top! Great work!

Now Simo get that engine bay all cleaned up for the BPG TTA reunion next year!!

 

[Jan Larsson]

Jan,
Did you just splice into the wire between the delay relay diode and coolant fan temperature switch so that the delay circuit still works as designed at the high temp set point?

Either of these mods work well if you do not have your A/C charged as it allows you to run the high speed fan.
Since I live in the hot desert I want my fan to run all the time at least in the summer heat. I may add a switch at a later date to control the high speed fan.
I just had my A/C recharged with R12 and wish I had done the mod when I first got the car.

Simo, yep that is exactly what I did then ran a wire in the GM type wiretube to an exisitng grommet in the firewall (same I use for the turbo gauge hose) to a switch I installed in a spare ashtray (along wiht one switch for the powerantenna and another one to turn my knock gauge on/off).

Works fine and is nice to turn on in slow traffic or activate the timed relay when parked to cool things down even if not above the set temp controlled by the sensors.

 

[Jan Larsson]

Good post Simo! Jan do you think you could so something like this with your mod as well? Pictures,description, etc?? I'll sticky this and keep it up top! Great work!

Now Simo get that engine bay all cleaned up for the BPG TTA reunion next year!!

I'll see what I can do Jim, I beleive I do have pictures of it already somewhere otherwise I can snap a few of the way I did it.

 

[TTA984]

There are other ways to do this mod,like Simo's or Jan's mod. But I went with Casper's fan mod. It is simple plug and play. Unplug AC pressure switch and plug it in. Very simple, it comes with a switch you can run inside the car, but now I got mine mounted beside one of the fan relays. Works great and when the switch is in the high position the high speed fan also runs a few minutes when the engine is off to cool down the engine. Got it thru Caspers for $40 something.You can leave the switch in the center position and the TTA is in normal factory fan mode.

 

[Jan Larsson]

There are other ways to do this mod,like Simo's or Jan's mod. But I went with Casper's fan mod. It is simple plug and play. Unplug AC pressure switch and plug it in. Very simple, it comes with a switch you can run inside the car, but now I got mine mounted beside one of the fan relays. Works great and when the switch is in the high position the high speed fan also runs a few minutes when the engine is off to cool down the engine. Got it thru Caspers for $40 something.You can leave the switch in the center position and the TTA is in normal factory fan mode.

Never looked at Caspers kit for doing this, sounds similar to what Simo did ... but nice way doing it as it's plug and play .. even if my way doing it costs pretty much zero $$

 

[TTA984]

This is the kit I used from Caspers:

http://www.casperselectronics.com/store2/product_info.php?cPath=61_11_65&products_id=630