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Old 10-05-2013, 06:56 PM   #31
Bonesacked
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I've always thought the auto A/C was extremely annoying, especially since that my A/C doesn't work; I'll be taking it all out eventually. I didn't know it would be that simple to prevent it from trying to turn on a nonexistent A/C system.
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Old 10-12-2013, 02:01 AM   #32
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can anybody tell us the why and the how concerning the AC being involved in the defrost process?
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Old 10-12-2013, 02:55 AM   #33
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Quote:
Originally Posted by gun7369 View Post
can anybody tell us the why and the how concerning the AC being involved in the defrost process?
The AC helps pull the moisture out of the air, but depending on the weather conditions sometimes you hot air to clear the windshield... and sometimes you need dry cold air. With this "mod" you have a choice whether to run the AC; since most people wouldn't think to manually turn on the AC in winter months to defog the window car makers just override the AC in defrost mode.
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Old 10-12-2013, 02:55 AM   #34
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when my a/c is on yes it bogs down bad, but when in defrost the compressor has never kicked on and has never bogged down so i dont understand why everyone says it comes on for defrost and it makes no sense at all when the compressor is used to cool the air and you want to heat it? i dont get it
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Old 10-12-2013, 03:03 AM   #35
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looks like sniper answered it the same time i was asking lol and i also looked it up and read it dries the air, if thats the case ive never noticed it kicking in....
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Old 10-12-2013, 03:38 AM   #36
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I don't remember the AC turning on (doesn't mean it doesn't) but I am hoping for a better defrost experience this winter. My 2003 Focus zx3 was around 138k so I replaced the timing belt (old one looked great, but didn't know beforehand), the waterpump (another preventative move) and the bearings/spinners. While under the hood I noticed after looking that I have an engine block warmer plug-in thingy by the front intake grill.

If i set up a timer that lets the engine block warmer do it's thing for an hour before I leave in the winter months, that should make all the difference shouldn't it? (central washington state, much dryer and extreme than seattle area)
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Old 10-12-2013, 04:32 AM   #37
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The AC being on in defrost should not affect my defrost here (dry and cold) so if i disable it I should have better mpg, right?
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Old 10-12-2013, 07:42 PM   #38
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the reason why we disable the a/c is because:

1) it robs power from the little 4 cyl motor
2) it wastes extra fuel, esp. since most of the time, you dont' need it on
3) we like to have control over when we want the a/c to run.

Most drivers are not aware enough to run the a/c when the air is very humid, and they ant to clear the windows in a hurry. That's why auto engineers designed cars to start the a/c automatically

On older cars, such as my 88 325is, it doesn't automatically turn on the a/c when the air is directed towards the defrost vents. You have to manually push the button if you want the a/c to run too

Just another way cars have evolved over the years.
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Old 10-12-2013, 07:50 PM   #39
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Quote:
Originally Posted by gun7369 View Post
If i set up a timer that lets the engine block warmer do it's thing for an hour before I leave in the winter months, that should make all the difference shouldn't it? (central washington state, much dryer and extreme than seattle area)
I dunno what "difference" your expecting it to make.

Where I come from on the prairies, it's necessarey to have a block heater running in the winter months (below -15C). This makes the difference between starting and not starting your car in the morning. You don't need to run it all night, but yes, just before you start out in the morning helps.

It certainly doesn't mean that the engine is warm by the time you leave in the morning. This is not a circulating heater. Circulating heaters are pretty pricey but do a fantastic job of ensuring the engine is warm, but also that the interior is warm very quickly once the car is started.

But the stock block heater isn' that great. It is designed to keep your block/head from cracking in the extreme temps, and easing the electrical strain on your starter and battery. That's about it.

Last edited by Stanley Rockafella; 10-12-2013 at 10:21 PM.
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Old 10-12-2013, 07:53 PM   #40
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Quote:
Originally Posted by Sniper Focus View Post
The AC helps pull the moisture out of the air, but depending on the weather conditions sometimes you hot air to clear the windshield... and sometimes you need dry cold air. With this "mod" you have a choice whether to run the AC; since most people wouldn't think to manually turn on the AC in winter months to defog the window car makers just override the AC in defrost mode.
What situation would you need cold dry air to clear the windows?


AFAIK, the a/c is designed to run with cold air in the summer (to cool the interior), and hot air in the winter to clear the windows and heat the interior
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