Upgrades and Aftermarket - 99 & up 7.3L EngineUpgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.
I did the heater bypass mod last fall. I am using the valve that has both lines going thru and the black vacuum line behind the glove box. I get heat when I set the control for defrost/floor or just floor - all other positions are for cooling.
It has finally warmed up enough that I have started to use the air condiontioner - what I found was the temp setting control for the air conditioner does not seem to work but it does work for the heating temp control. What I mean by not work for cooling is I had the control turned all the way to the hot side and I still get very cool air with fan set a lowest setting. Does this make any sense?
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'01 F250 XLT SC SB 4X4 Auto, New to me at 51,000, tranny died at 57500, locally rebuilt tranny with Tugger Kit,Heavy duty TC,Tru Cool Max cooler and 28K cooler, Pricol tranny & EGT gauges, OilGuard bypass, DP Chip-stk,40tow,80econ, SP Diesel SSEBTC, AIS, CCV, 18K Mod, Harpooned and Modified Hutch, HX oil line, Regulated fuel return, Airdog, Magna Flow 3.5" to 4.0" 409SS exhaust, Magnefine tranny filter, Heater/AC mod, Coolant Filter and switched to Gold, 203 degree thermostat, Running Amsoil 15w-40, EasyRider 5th wheel hitch w/Reese 16K head. 2005 5th Wheel Fleetwood Terry 255RLDS(9-10K), Honda 2000EU generator.
So you think there may be two solenoids to control temperature setting? One for heat and one for cooling? I know the compressor clutch is working - any idea where the temperature control selenoids might be located?
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'01 F250 XLT SC SB 4X4 Auto, New to me at 51,000, tranny died at 57500, locally rebuilt tranny with Tugger Kit,Heavy duty TC,Tru Cool Max cooler and 28K cooler, Pricol tranny & EGT gauges, OilGuard bypass, DP Chip-stk,40tow,80econ, SP Diesel SSEBTC, AIS, CCV, 18K Mod, Harpooned and Modified Hutch, HX oil line, Regulated fuel return, Airdog, Magna Flow 3.5" to 4.0" 409SS exhaust, Magnefine tranny filter, Heater/AC mod, Coolant Filter and switched to Gold, 203 degree thermostat, Running Amsoil 15w-40, EasyRider 5th wheel hitch w/Reese 16K head. 2005 5th Wheel Fleetwood Terry 255RLDS(9-10K), Honda 2000EU generator.
When you do the By-pass mod.... when you are in ANY A/C setting, the valve you installed to do the mod has Shut Off, or re-directd heated coolant to the Heater Core. You don't have any control of Heat temps.... from the temp knob.
The reason we do the Mod is: Temprature is controled by the knob setting as to how much air is re-directed thru the heater core box in the A/C, Heater Plenum. (Box under the dash) Even with the Heat door/flap fully closed, and the A/C on, Cooled air passes >NEAR< the heater box... Close enough... to heat the cooled air [some]. By re-directing the heated coolant... away from the heater core.... the A/C air is, or can be, 10 to 15 degrees cooler.
There is only 1, vacuum operated selenoid.... the one you installed in the Heater Hose.
Joe [img]/ubbthreads/images/graemlins/shrug.gif[/img]
On other vehicles I have own the temp control seemed to control how long the air conditioning compressor ran - it's duty cycle. So, if I understand your above explaination, you are saying that the SuperDuty temp knob controls either heat or cooling by adjusting the amount of air flowing over the heater core and the source of the incoming air? I seem to remember reading somewhere that the compressor runs on our trucks even when we are using the heater settings.
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'01 F250 XLT SC SB 4X4 Auto, New to me at 51,000, tranny died at 57500, locally rebuilt tranny with Tugger Kit,Heavy duty TC,Tru Cool Max cooler and 28K cooler, Pricol tranny & EGT gauges, OilGuard bypass, DP Chip-stk,40tow,80econ, SP Diesel SSEBTC, AIS, CCV, 18K Mod, Harpooned and Modified Hutch, HX oil line, Regulated fuel return, Airdog, Magna Flow 3.5" to 4.0" 409SS exhaust, Magnefine tranny filter, Heater/AC mod, Coolant Filter and switched to Gold, 203 degree thermostat, Running Amsoil 15w-40, EasyRider 5th wheel hitch w/Reese 16K head. 2005 5th Wheel Fleetwood Terry 255RLDS(9-10K), Honda 2000EU generator.
On other vehicles I have own the temp control seemed to control how long the air conditioning compressor ran - it's duty cycle. So, if I understand your above explaination, you are saying that the SuperDuty temp knob controls either heat or cooling by adjusting the amount of air flowing over the heater core and the source of the incoming air? I seem to remember reading somewhere that the compressor runs on our trucks even when we are using the heater settings.
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The compressor Only runs in the MAX A/C, A/C, Vent/Floor and De-frost settings, on these Fords.
But with the Heater Core By-pass Mod, you loose Heat temp control, by the knob, because you have shut off the flow of heated coolant, thru the heater core, in Max A/C, A/C and Vent/Floor.
If you don't get any heat in any position that uses the dash vents or defroster you are hooked into the wrong line under the dash. You hooked to the red line and you should have hooked to the white line.
FOMOGO
__________________ 2001 F-250 Lariat, Black, CC, SB, 2WD
304 hp and 627 tq on Dunbars Dyno
2001 F-250 XL standard cab, beater, hauling trash... Stock except for a 60 horse flash...
304hp and 617 tq on Dunbars Dyno
2001 F-250 Xl Standard cab, project truck...
Custom Tunes by DP-Tuner, Custom Fuel System by ITP Diesel, Custom Trans by BTS
I do get heat in the three bottom positions on the right - can't remember what they are - floor, floor/windshield, windshield - I think. I get cooling first position to right and all positions to the left. Just did not notice the lack of heat control like I notice the lack of cooling control - this thing really cools well now, too much for the wife sometimes, but we can adjust vents to compensate. Thanks for the explaination.
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'01 F250 XLT SC SB 4X4 Auto, New to me at 51,000, tranny died at 57500, locally rebuilt tranny with Tugger Kit,Heavy duty TC,Tru Cool Max cooler and 28K cooler, Pricol tranny & EGT gauges, OilGuard bypass, DP Chip-stk,40tow,80econ, SP Diesel SSEBTC, AIS, CCV, 18K Mod, Harpooned and Modified Hutch, HX oil line, Regulated fuel return, Airdog, Magna Flow 3.5" to 4.0" 409SS exhaust, Magnefine tranny filter, Heater/AC mod, Coolant Filter and switched to Gold, 203 degree thermostat, Running Amsoil 15w-40, EasyRider 5th wheel hitch w/Reese 16K head. 2005 5th Wheel Fleetwood Terry 255RLDS(9-10K), Honda 2000EU generator.
I hear ya. Wife complains about it too. I control it with the Fan Speed. Once things git cooled down, even in the 100+* temps'round here.... the A/C sure works better after the By-pass mod.
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