Being out of FLorida I need the A/C to blow as cold as it can. I was told the heater core constantly has coolant running through it. So I was wondering how I can modify it to stop running through there when the air condition is running. I dont want to bypass the heater core but want to put in a valve. I just dont know how to get the valve to open and close when needed. I saw an image on what it looks like just dont know how to get er done correctly. Any help would be great. Thanks.
http://i17.ebayimg.com/02/i/01/7d/49/cc_1_s.JPG

I have a 99 model year. :

 

I can't find the website I ordered my kit from but I have this info instead. It is copied from the website of Steve Baz and the credit and thanks go to him for collecting and posting.
:note
You have a picture of the mod I made and it shows the cut-off installed next to the fuel filter cover. That is where I have mine also.


AC MOD
It will stop the flow of hot water through the heater core when the AC controlls are in the MAX setting and the OFF position providing cooler temps and preventing the hot pocket of air down by you feet. I went to NAPA and asked for the 'hot water shut off valve' from a 1990 Ford Ranger with a 4.0 V-6, I also got 4 - 5/8 hose clamps, a couple feet of 1/8" vaccume line a a 1/8" plastic "T" for the vaccume line. To begin the install loosen the cap on the radiator overfill to remove pressure from the system (do this while the engine is cool). On the passenger side of the engine compartment there are 2 - 5/8" hoses that come from the firewall and continue to the engine, these are the heater hoses. Cut the hose closest to the drivers side (It does'nt really matter where, I did mine about 6 inches after the fire wall). Then holding the 'shut off valve' with the vaccume controller twards the pass side install the portion of the heater hose coming from the cab to the top left nipple on the 'shut off valve'. Tighten the clamp. Install the portion of the heater hose coming from the engine to the top right nipple and tighten the clamp. Next cut the heater hose closest to the pass side in the same location as the previous. Install the portion coming from the cab on the lower left nipple, tighten the clamp. Now install the portion going to the engine on the lower right and tighten the clamp. Measure out how much of the 1/8" vaccume line you need to reach from the bottom of the vaccume canister on the shut off valve to the white vaccume line on the pass side that goes to the vaccume operated door underneath the pass side cowl. Cut that white vaccume line and splice in the 1/8" plastic "T". Then run the 1/8" vaccume line you meassured out from that plastic "T" to the nipple on the bottom of the vaccume canister on the shut off valve. It sounds more complicated than it is. Once you do it it will seem real simple. Happy trucking!
Thanks Bryan Central Texan

 

You can also do a search on www.ford-trucks.com
There are several writeups on this in the 99+ forums.

 

Thanks. Doesnt seem hard to do at all. Now that I have a reference I can get er done. Im glad you told me what year and model to use the valve from cause some valves open with suction and some close with suction. Thanks