Engine idles up and down when defroster is on
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Senior Member
Joined: Jan 2008
Posts: 109
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From: Springfield, Missouri
Engine idles up and down when defroster is on
Well when i start my truck and have it in park then turn my defroster on the idle goes up and down quite a bit. Anyone know's what this maybe. THANKS
Senior Member
Joined: Sep 2007
Posts: 500
Likes: 1
From: La Porte, TX
Is that idle really normal? The computer should keep it constant.
Either I'm not noticing it or the idle on my truck with the AC compressor running doesn't noticeably affect the idle. Just saying...
I do have to run my AC all the time with the bad seal job on the upper edges of the windshield...it lets too much humid air in. Gotta' get that fixed soon.
Oh, anyway, the only instances I have personally seen of this drop in idle were from a low AC charge--these things hold around 2 Oz, so it doesn't take much loss to throw things off--or when my Ranger had already dropped a cylinder and that put a pretty big load of the compressor to the routine drop of a few hundred RPMs. So, something is going on somewhere.
Either I'm not noticing it or the idle on my truck with the AC compressor running doesn't noticeably affect the idle. Just saying...
I do have to run my AC all the time with the bad seal job on the upper edges of the windshield...it lets too much humid air in. Gotta' get that fixed soon.
Oh, anyway, the only instances I have personally seen of this drop in idle were from a low AC charge--these things hold around 2 Oz, so it doesn't take much loss to throw things off--or when my Ranger had already dropped a cylinder and that put a pretty big load of the compressor to the routine drop of a few hundred RPMs. So, something is going on somewhere.
Senior Member
Joined: Jan 2008
Posts: 218
Likes: 0
Originally Posted by AlfredB18
Is that idle really normal? The computer should keep it constant.
Either I'm not noticing it or the idle on my truck with the AC compressor running doesn't noticeably affect the idle. Just saying...
I do have to run my AC all the time with the bad seal job on the upper edges of the windshield...it lets too much humid air in. Gotta' get that fixed soon.
Oh, anyway, the only instances I have personally seen of this drop in idle were from a low AC charge--these things hold around 2 Oz, so it doesn't take much loss to throw things off--or when my Ranger had already dropped a cylinder and that put a pretty big load of the compressor to the routine drop of a few hundred RPMs. So, something is going on somewhere.
Either I'm not noticing it or the idle on my truck with the AC compressor running doesn't noticeably affect the idle. Just saying...
I do have to run my AC all the time with the bad seal job on the upper edges of the windshield...it lets too much humid air in. Gotta' get that fixed soon.
Oh, anyway, the only instances I have personally seen of this drop in idle were from a low AC charge--these things hold around 2 Oz, so it doesn't take much loss to throw things off--or when my Ranger had already dropped a cylinder and that put a pretty big load of the compressor to the routine drop of a few hundred RPMs. So, something is going on somewhere.
