1999 gmc safari - 1999 GMC Safari

it is probabably in your alt.

surely ......change the wires check your sparkplugs..

Hello woadie4_00 and thank you for asking your question, on Fixya.

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 1999 GMC Safari, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose your overheating 1999 GMC Safari
Pay close attention to the 'fixing leaks' part. You will probably need a heater core (from the sounds of it).

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Thanks for the vote, and good luck!

Inspect the lower ball joints for excessive wear or movement.

simple if the wire are wrong in order this is not good so do this get a book aor got to the library and find the book and find the firing order some car have the numbers stamp on top of the block

timing position sensor on the block or at the crankshaft pulley.If not the computer is most likely bad

try this link:
http://www.edmunds.com/used/1999/gmc/safari/11196/specs.html

my friend recently obtained a gmc safari. he knows minimal about cars let alone a gmc. can anyone out there tell me where the fuses are located for the wiper blades. thanks

it should be the switch on the tranny that turns on the reverse lights.

maybe it's a left handed nut