20 Most Recent 1997 GMC Safari - Page 4 Questions & Answers

There's a good possibilty that you have a vacuum line off. When the heater controls lose vacuum, the heater will go into the defrost mode. There should be a small line, about 1/8 inch in diameter, that goes from the engine to the firewall. It's most likely on the passenger side.

The switch should pop out of the door panel using a flat screwdriver in on cluster that holds all the window switches. Thenyou can rmove the switch you want easily. Just be gentle when prying the cluster out of the door, and the switch out of the clusteras not to damage the holding clips.

if you change the brake booster you must have knock the brake switch off or out of adjustment that will stop the shift inter lock system from releasing

We do not have the factory repair manuals that contain these diagrams. You can access them here for a fee.www.alldatadiy.com

You may have a hose to the heater leaking, or a lower intake gasket leaking. You will have to remove the engine cover to get a good look. If you have access to a cooling system pressure tester, it would realy help out.
Good hunting!

You probabbly have a defective latch mechanism. You will need to pull the rear seats out to get room so you can take the panel off of the rear door and get access to the latch mechanism so it can be opened/fixed.

It is located coming off of the starter,along with the large battery cable,pull on the fusible link,if it pulls apart like taffy,then it is burned into.

You have more than one on your vehicle. I posted a picture below of all the locations. It depends on what code you are getting to lead you to the correct one but there are tests as well. The most common ones to go are the upstream or bank 1 sensors as they are closer to the engine and get the most of the fuel out the exhaust to give you your readings and tell the computer how rich or lean to burn your fuel I hope this helps.