20 Most Recent 1999 GMC Safari - Page 4 Questions & Answers

There must be a short, loose wire, bad bulb, all of these should be checked.

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

they are probably welded and you need to have a body shop do the replacement.

I posted some information about your security system on the other question that you posted where you mentioned the pellet in the key on your older vehicle.Let me ask you this: Does the starter not crank the engine when you are experiencing this difficulty? Or is the starter cranking the engine and it just won't start?The reason I ask is because if the starter cranks and your problem only occurs on cold mornings, the problem is most likely to be caused by a malfunctioning Engine Coolant Temperature (ECT) sensor.In any case, you should scan your computer network for possible fault codes to begin any diagnosis of either your engine control system or your security system (Unless you really like wasting your hard-earned cash trying to "GUESS" what is wrong).

1999 GMC Safari is equipped with a PassLock* system. It is designed to disable engine starting unless the ignition lock cylinder rotates correctly when the proper key is installed. The system is similar in concept to the PassKey* system. However, it eliminates the need for a key-mounted resistor pellet.The components of the PassLock* system are as follows:> The ignition lock cylinder> The ignition switch> The PassLock* sensor> The PassLock* module> The security indicator> The Vehicle Control Module (VCM)If any of the components (with the exception of the security indicator) is replaced, the PassLock* sytem must be reprogramed before engine start will be enabled.When the system malfunctions, it is necessary to retrieve fault codes from the VCM to correctly determine which part of the system is causing the problem.* "PassKey" and "PassLock" are registered trademarks of Genral Motors Corporation.

you have a sucked shut or broken vacuum line under the hood somewhere. mine was burnt and broke, same problem. it is a little, skinny, hard vacuum line from left side of motor over to right across the front.

you need to change your motor mounts, they aren't that expensive, just the labor.

my car left me stranded in the mountains because of the anti-theft device. I ended up in the dealers, paying a lot, but they changed the housing of the steering column by the ignition where it supposedly caused a short and wouldn't allow the car to start. That was 2 yrs ago and it is acting up again.

EITHER WRONG TYPE BULB OR BULB SOCKET CORRODED. TRY SPRAYING A LITTLE ELECTRICAL OR ELECTRONIC CLEANER IN BULB SOCKET SEE IF HELP PROBLEM.

They are controlled by vacuum ... a line must have been disconnected or broken when the trans was replaced. Remove the dog house and look for a small vacuum line broken or pulled apart.

Check the blower motor resistor pack.
This is usually located in the blower motor ducting in the air stream.

First you need to find out why there's no ignition spark; the fuel pump will not run absent a spark signal.

Go to:
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1) Create a free account.

2) Login

3) Go to Vehicle Repair Guides

Scan over the interior and electrical sections and try to find your solution for free

According to a Haynes Manual- connect 12v(less is best) to the POWER terminal, Neg to the Neg- then hook a DMM (Digital Multi Meter) to the "signal" terms. Set the DMM to OHMS. Use compressed air or duster- to blow on wire or film (GENTLY!!). You should see an INCREASE in resistance. Imaginge a toaster. Dead short- wire glows hot. Blow on it- wire cools. the ECM reads the incoming air stream- by how much the wire(or foil) is cooled. The ECM wants(and TRIES) to keep the wire(or foil) at a certain preset temp. How much more voltage is needed to do his- determines the feedback ratio to the injectors- to the amount of fuel. USUALLY REPLACE. Be careful to COMPLETELY cover the shiny heatsink portion of the new sensor with ALL of the supplied compound- or the new unit will burn out QUICKLY!!

You more than likely have a vacume hose that has come off at the vent switch or under the hood. Unfortunatly you will have to pull the vet switch out of the dash to see if there are any vac. lines off. You can visibly inspect the rubber and plastic vacume lines under the hood. Just be careful how you handle the plastic lines as they become brittle from the heat under the hood after a period of time.

If the clutch on your radiator fan is broken the fan will not spin fast enough to cool the engine. Make sure your fan shrouds are in place, otherwise the air will not be sucked through the radiator properly.

Your radiator may be clogged, the radiator cap may be broken, the thermostat may be sticking, a hose may have collapsed

http://www.popularmechanics.com/cars/how-to/maintenance/1772922

This car is equipped with Passlock antitheft security by GM. You dont have a chip, but there is a transponder in the key head. This system is known to fail. The fact that the security light is on proves the failure of the Passlock and why it wont run. The hard part is finding out which part of the passlock system has failed. Read this link for info and DO IT YOURSELF solutions to the problem.

http://vatspasslockpasskeysecurityhelp.yolasite.com/