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General Site Info => General Discussion => Topic started by: st3vomettler on March 22, 2017, 07:26:24 pm

Title: Climate control
Post by: st3vomettler on March 22, 2017, 07:26:24 pm

I inherited my dads 90 c1500 5.7 and ever since he bought the truck the digital climate control is always on with the key off and was wondering if anybody can help me figure out why

Title: Re: Climate control
Post by: Irish_Alley on March 23, 2017, 07:43:17 am

you talking about the display is always on? like just the arrows pointing down?

i remember my moms truck having a similar issue but details are fuzzy. my (wifes) 94 doesnt have any issue. i didnt really drive my 89 that much but this issue doesnt ring a bell for it

Title: Re: Climate control
Post by: st3vomettler on March 23, 2017, 09:05:43 am

Yes the display is always on you can Hit the heat button and it will start working with the key being in your pocket

Title: Re: Climate control
Post by: VileZambonie on March 23, 2017, 12:57:34 pm

This is not related to these trucks so questions like this belong in general discussion.

Title: Re: Climate control
Post by: hatzie on March 23, 2017, 02:43:46 pm

The Wiring, Unit Repair, and Service bulletin manuals for the 1990 GMT400 C1500 are here. 
https://www.mediafire.com/folder/b7hnp7aabn0jt/1990 (https://www.mediafire.com/folder/b7hnp7aabn0jt/1990)
I don't have the 1990 GMT400 service manual in my library.  You can use the 89 & 91 manuals to fill in the blanks.
https://www.mediafire.com/folder/a94x3mxehexw6/T400

You may do better asking this question on a GMT400 specific forum or sub-forum. 
http://www.gmt400.com/ (http://www.gmt400.com/)
http://67-72chevytrucks.com/vboard/forumdisplay.php?f=12 (http://67-72chevytrucks.com/vboard/forumdisplay.php?f=12)

Title: Re: Climate control
Post by: st3vomettler on March 23, 2017, 04:14:50 pm

Ok thank you