Re: Chevy K2500

Posted by Bob on January 02, 2007 at 19:51:14 from (69.178.229.154):

In Reply to: Chevy K2500 posted by Tweeter on January 02, 2007 at 16:01:43:

Just because the electronic heater contol "head" appears to be functioning does NOT mean the servomotor attached to the heat control (blend) door is following what the control "head" tells it to do.

There is NO feed back from the servomotor to the control head. The control "head" simply issues a positioning command and ASSUMES the motor has obeyed. The bar graph on the control "head" display will move, even though the servomotor DOESN'T move.

You may have a control "head" problem, where the "head" shows the bargraph moving and is defective, and not sending the signal to the servomotor. You may have a wiring problem between the contol "head" and the servomotor. You may have a defective servomotor, OR a mechanical problem, where the servo is moving, and the "blend door" is not. Also, the blend door is plastic, and has a rubber flange around it. Sometimes, the rubber lets go of the plastic door, so the door no longer seals, allowing cold air to bypass the heater core.

LOTS of stuff to check, all located in a MISERABLE place to work!

Replies:

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]