Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Chevrolet > Astro > M Bodies
Register FAQ Community Arcade Calendar
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools
Old 08-30-2009, 10:42 AM   #1
direland
AF Newbie
 
Join Date: Dec 2005
Location: Waterloo
Posts: 33
Thanks: 0
Thanked 0 Times in 0 Posts
AC compressor cycles on in defrost

95 Safari. Why does my AC compressor cycle on and off when I move control lever to defrost?
direland is offline   Reply With Quote
Old 08-30-2009, 10:56 AM   #2
brcidd
AF Enthusiast
 
brcidd's Avatar
 
Join Date: Jul 2005
Location: troy, Ohio
Posts: 2,311
Thanks: 2
Thanked 171 Times in 169 Posts
Re: AC compressor cycles on in defrost

Because dry air can defrost wet foggy windshields faster than wet damp air--- all modern vehicles are designed to do this...
__________________
Automotive A/C Engineer with:
'99 IH 4700 Toy Hauler
(2) '95 GEO Prizms both maroon
'99 GMC Yukon
'95 Chev 3500, 454 Dually Crew Cab- 145k miles-
Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone-
'92 Chevy Lumina Van 3.8L 264k
'86 GMC S-15 - 2.8L 154k
'87 Buick Park Ave . 187k
'86 Buick Park Ave 3.8L 199k miles- gone
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles-
brcidd is offline   Reply With Quote
Old 08-30-2009, 11:11 AM   #3
direland
AF Newbie
Thread starter
 
Join Date: Dec 2005
Location: Waterloo
Posts: 33
Thanks: 0
Thanked 0 Times in 0 Posts
Re: AC compressor cycles on in defrost

this is when AC is not on.
direland is offline   Reply With Quote
Old 08-30-2009, 12:09 PM   #4
Blue Bowtie
Registered Offender
 
Blue Bowtie's Avatar
 
Join Date: Mar 2006
Location: Rural
Posts: 6,523
Thanks: 6
Thanked 342 Times in 337 Posts
Re: AC compressor cycles on in defrost

Quote:
Originally Posted by direland View Post
this is when AC is not on.
Correct. The compressor will run to help dehumidify the intake air for more effective defrosting. Many cars since the 1970s have done that.
__________________
Permanent seat assignment on the Group W bench...
Automotive Forums Survival Guide
Blue Bowtie is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD

Go Back   Automotive Forums .com Car Chat > Chevrolet > Astro > M Bodies


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 02:16 AM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts