Better A/C Performance

[Maniak]

On our 1992 I got our A/C to run almost 10F cooler by adding a heater control valve from a 1995 Explorer. It cost me $16.99 for the control valve (got it from AutoZone, a local auto parts chain store).

You put it just outside the heater core in the heater lines and run a vacuum line from it to a t (you add the t) for the blend door. When I change my controls from panel to MAX-AC it closes the blend door which then closes the heater control valve. Once closed it makes the water in the heater lines bypass the heater core. When I do this our A/C goes from 50F to 40F (thats with all the doors open so it is also using outside air).

It a cheap fix that Ford figured in in late 1994 (I told them 1995 since I knew all 1995's had it.. and only late 1994's did)

~Mark

 

[ProPhotog]

vacuum door

what line did you use and how does it know when the blend door is closed to close itself?

 

[Maniak]

Take the glove box out of the dash (only 2 screws) and look behind it. You will see a Vacuum line going to a vacuum actuator(sp?). When your controls are set to MAX AC it puts vacuum to that line which moves that actuator. I put a T right there and ran a Vacuum line through the firewall to the "Heater Control Valve". The Heater Control valve will bypass the heater when there is vacuum (when the controls are set to Max A/C). When you move the control to anything else it lets the water into the heater core and you can have heat.

I hope that helps.. its Monday and I'm still not thinking straight (it is still before lunch)

~Mark

 

[tisdale35]

AC not cooling

First I live 40 miles south of you in Angleton, TX I have the same problem with my 94 EX. My AC doesn't cool good and my motor overheats when it is real hot and I am standing still. I beleive it is my fan clutch not allowing the fan to spin fast enough to cool everything constantly. I am going to change it ASAP. At night time or in the morning my AC is B-R-R cold but not in the heat of the day during the peak summer months. The other months everyting is fine. I've been putting it off for 2 years now and it is like really hot out now. Anyway, it sounds to me like you may have a similar problem. I was also thinking of mounting 2 electric fans and get rid of the other fan because I was hoping to someday put in a V-8 and I would need it anyway.
Sean Tisdale

 

[aldive]

I am very pleased with the performance of my electric fan. Not one sinfle problem, even when towing.

 

[MEXEXP]

No I think here is hotter

I live in Mexicali, Mexico on the border with Calexico, Ca. and here the temperatures right now are 115 plus and what we do here to help run the engine in traffic with the a/c on we add an Auxiliary electric Fan on the front of the radiator and runs with a relay to the compressor and really helps a lot. On cooling the A/C and cooling the engine a Bit.

 

[V8BoatBuilder]

Be careful with the insulation of the A/C lines. The lines that do not sweat get hot, and need to release heat. The moisture from the sweat, if trapped in, will rust and corrode A/C parts. I recently had to replace my accumulator since ford insulated it from the factory, and it rusted through.