FEH (MMH) Defroster Operation
I do not yet have my FEH (its on order) But as I have read thru tips and blogs I understand that operation of the climate controll on "Defrost" requires operation of the AC compressor thus it also requires operation of the ICE - and will it prevent the ICE from shutting off and going EV. I have one word for that: RAINX I live in Colorado and use this stuff all the time. There are two products ANTI-FOG for the inside of the windscreen and also normal RAINX for the outside .... Snow does not stick and brushes off, Water runs off faster than the wipers can even get there, and the Anti fog on the inside prevents vapor accumulation "fog" on the windshield...... with these products I seldom use defrost mode as I try to hypermile my existing (non-hybrid) vehicle as it also runs the compressor in defrost mode.
Pretty low tech... But it works!!
I would like to find a way to be able to run FEH air vents in the defrost mode without the compressor as even a simple fresh air flow can very often address interior moisture on the windshield - but i bet its a lot more complex that putting a relay & switch on the compressor clutch.... the engine management system must be very integrated.
In temperatures below freezing, the PCM will not allow the compressor to operate and you can drive in EV running the defroster. The anti-fog sounds like the way to go anyway. When you turn the climate control to any position but OFF, the electric heater motor will circulate coolant from the radiator when in EV. This will heat up the cabin but also drop the coolant and head temperature. In cold weather, this will shorten EV time and in any weather use power to run the heater pump.
The only time I run the climate control is for the cabin A/C in hot weather. I did a simple heater core by-pass so the A/C recirculates cool air longer in EV. By not having the hot coolant circulate in the climate control system ductwork, the air gets colder faster and last longer in EV.
As far as a switch to control the compressor, I recommend against it. The HV battery has an AUG A/C that shares the A/C compressor. In temperatures above freezing, the HV battery needs to use the compressor to cool the battery during heavy charging conditions and hot weather. If your HV battery was damaged from overheating, Ford may void your warranty because of such a switch. Overheating codes and A/C malfunction codes are stored in the modules and can't be cleared by the SGII at this time.
Why am I not surprised that
Why am I not surprised that you are getting an 09 FEH!
I am curious as to what you have learned about what FE directed software changes may accompany the new engine/battery combination in the 09.
Best of Luck,
I've been burning
I've been burning the midnight oil reading new Ford patents, Ford engineer papers and just anything I can find including the new "Energy Saver" Michelin tires. Ford has had the patent on the roll over protection with a regen system for a long time now, finally the '09 will be equipped.
All I've read is the programming between EV and the gas engine has been improved over the '08 which is far better than my '05 FEH. The new 2.5L will have an all new torque curve with more HP at lower RPM's, so I'm excited about that. Not that I need more HP, but it's there in a more FE manner than the 2.3L design. Also, I like the new FE variable intake valve timing Ford has improved over Honda's system.
The HV battery may have some changes if Ford has adapted some of their newer patents, but I don't know for sure.
A Ford Hybrid Engineer also stated he was waiting to get his new "09 FEH, so the new changes must be worth the wait. At any rate, I don't see Ford moving backwards in the FE market of the FEH/MMH. After driving your '08, more than likely I will maintain a lifetime average of 50mpg in an '09 giving our conditions here in So. Florida. It would be nice if we had some rolling hills though.
For those of you here who want to look at the most recent to some of the first patents by Ford, here is the link I use:
I am in Colorado.
I am in Colorado. When I went in to order my FEH in Feb. the dealer told me that there was no "available" 2008 model inventory anywhere in the US Dealer network, or on Ford staging lots.
They were unsure at that point if an order would be built as a 2008 model or a 2009 - as the factory was approaching model year changover shutdown/cutover (if not already doing it)
Here is where it gets dicey, and I am still not totally convinced as to what is going on. following a couple of weeks they called me and told me that they were switching my order to a 2009, as a 2008 was no longer an option. I also called Ford customer service direct and they show that I do have a FEH on order, but he could not provide me any real data as to what-or-when.
I wish i could find some info as to what is actually happening at the Factory - I believe they have already switched production of the F150 made there to the 2009 models but BUT I am unsure on the FEH MMH MTH
I am expecting changes to my costs and options for the 2009 but I have not been contacted yet on this.
Does anyone have a Bat-Phone (direct line?) to Ford that would provide better info?
I really don't
I really don't know how important it is for you to get a 2008, I myself am waiting for the 2009 models, there are just too many improvments for me to get a 2008.
But there are two Mercury Mariner Hybrids available . One in East Hartford, Connecticut, I have not seen this one, but is fully loaded except for the accessories (remote start, lumination and side steps, but has all the other high end options. There is another in West Springfield, Mass.
If you go to the Mercury website and check out the inventory you will see them. I think the one in West Springfield, I actually saw, which had leather without heat. Thats why I did not get it.
My 2 Cents.