CHPMustang
Senior Member
About a week ago I had the hood up looking for something to do that would better the performance of the Air Conditioning on the Excursion which many X owners know I'm always in pursuit of
Typically I shut down the front heater core every May(before we hit the 90's) and looking on the results of that mod I went ahead and looked at the possibilities of doing the same for the rear heater core(yes Excursions have 2 of em plus 2 evaporators)
I located the plumbing in the engine area that leads to the rear,cut off the thick aluminum crimps,capped off the quick discos that lead to the rear HC and then used a 3/4" ID straight coupler with a pair of worm gear clamps to connect the two coolant lines together.While the straight coupler works fine I'd like to replace it with a 180 degree or U shaped coupler to keep the coolant lines in their original orientation as if their were connected stock.
Environmental conditions and results
From the initial observations compared to 2007 in the same weather conditions there's an easy 4-5 degree drop at freeway speeds,while idling at 7-11 it typically would be in the low to mid 50's but with the rear reroute in place I'll be comfortable saying it lowered around 10 degrees which is a huge drop.
I was making plans to have the AC fully serviced but since the rear mod has been done I don't think at this time servicing is required.
The results from this mod was on our Excursion so your numbers may vary with other trucks.
I'll get some pics up.
Typically I shut down the front heater core every May(before we hit the 90's) and looking on the results of that mod I went ahead and looked at the possibilities of doing the same for the rear heater core(yes Excursions have 2 of em plus 2 evaporators)
I located the plumbing in the engine area that leads to the rear,cut off the thick aluminum crimps,capped off the quick discos that lead to the rear HC and then used a 3/4" ID straight coupler with a pair of worm gear clamps to connect the two coolant lines together.While the straight coupler works fine I'd like to replace it with a 180 degree or U shaped coupler to keep the coolant lines in their original orientation as if their were connected stock.
Environmental conditions and results
*90-91 degrees outside air temp
*70% humidity
*Sunny and Clear
*37 degrees front vents @ fan speed #3, rear fan speed #1(low)
*Freeway at 65mph
*42/43 degrees at idle while kids run into 7-11 for Slurpees
From the initial observations compared to 2007 in the same weather conditions there's an easy 4-5 degree drop at freeway speeds,while idling at 7-11 it typically would be in the low to mid 50's but with the rear reroute in place I'll be comfortable saying it lowered around 10 degrees which is a huge drop.
I was making plans to have the AC fully serviced but since the rear mod has been done I don't think at this time servicing is required.
The results from this mod was on our Excursion so your numbers may vary with other trucks.
I'll get some pics up.