20 Most Recent 1999 Pontiac Grand Prix - Page 5 Questions & Answers

when was it last serviced ?, if recently get the OBD codes read as will show which sensor/switch could be at fault , otherwise i'd get the vehicle serviced

i would get the OBD codes read as this will pinpoint the faulty sensor/switch , will save you time and money searching blind for the problem component

If your car has the climate control option where you can change the temp for each side of the car, each side has a small like motor call the heater/AC blend door actuator.. Not sure that's your problem but you may want to look into it. <---

The heater core may be plugged up so that no coolant flows, thus no heat at all.

On the car you are asking about, mass air flow sensors are used to measure the amount of air moving into the throttle body. The value it measures is used by the powertrain control module (engine computer) to calculate the correct amount of fuel to deliver through the fuel injectors for the optimal level of all-around performance of fuel economy, emissions, and spark plug life.

check your motor mounts

How are you checking the boost pressure? If you know what you're doing and are checking the boost pressure and it is not there and the compressor is good, a valve like a waste gate on a turbo controls the boost pressure. Check to see if it is stuck open letting all the pressure out.

sounds like a fuse or relay ,have you checked the fuse box drivers side lower dash for headlight fuse(s) also in engine bay there is another fuse box with relays ,list will be on the cover ,i'd start there as power is going to bulb on one circuit , other than that the switch may not be working fully

re align the window track guides at the front and back of the glass . They are not parallel with the up motion and are allowing the glass to tilt and jam.

With a scanner this can be tested possible problems are stuck shift solenoids or internal mechanical failure. Most generic scanners do not have the software to test.

I do not thing so,take out and put back new one.

Most likely yes. An honest shop will check and actually let you know if the camber/caster toe-in/out is within specs.

-I don't think these components cause that. What I see base on your information: 1. Fuel . (Including Pump, pressure regulator or may be bad fuel pump relay too) Good Luck Mai