Question about 2000 Pontiac Grand Prix

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My 2000 grand prix is over heating and the heater wont work. We replaced the thermostat and a fuse for the fan.

We have replaced the thermostat and had to replace the fan fuse as well. It is still over heating and my heater will not work. Whats wrong?

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  • 12 Answers

It might be the thermostat

Posted on Feb 09, 2013

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Posted on Jan 02, 2017

emissionwiz
  • 75235 Answers

SOURCE: THERMOSTAT REPLACEMENT

You will need a 1/2" socket with ratchet, and a 1/2" wrench for the actual removal of the thermostat housing. First, remove the air duct from the air filter housing and the air intake connection to the engine. Set aside. Next, remove the upper radiator hose from where it connects to the engine by loosening the hose clamp. At the other end of this part where the hose was removed from is the "L" shape that houses the thermostat and bolts to the engine. This part (housing) has two bolts. The top bolt will require the use of an extension on your ratchet which you will need to insert between the water bypass pipe and the exhaust heat shield before coupling with the 1/2" socket. Loosen the top bolt. The bottom bolt will require the use of the 1/2" wrench, as the socket will not fit due to the location of the heat shield. NOTE: the bottom bolt only needs to be LOOSENED and not removed, as the housing has an open "C" at the lower bolt location allowing the housing to pivot upward from that bolt. After removing the top bolt and loosening the lower bolt, you can pivot the "pipe" end of the housing downward and carefully maneuver the housing out of its location. You should now see the thermostat. Clean surfaces of the engine and housing well. Insert the new thermostat with the "spring" into the engine and the "bell" outward. Be sure the seal is seated properly into its socket in the engine. Position the housing carefully, making sure not to move the thermostat out of position. Reassembly is the reverse of removal. In my case, I did not use any gasket seal. The thermostat has a rubber seal on it which works well on its own. Adding gasket seal may make removing the housing in the future more difficult

Posted on Jun 01, 2009

  • 2 Answers

SOURCE: no heat or cold air from vents

either bad blower motor or lose wire to blower motor.

Posted on Jun 13, 2009

  • 16 Answers

SOURCE: 1996 Grand Prix SE, cooling fans inop

try the fuse,if not that the wiring is bad from the fan to the switch.

Posted on Jul 13, 2009

  • 118 Answers

SOURCE: 2003 grand prix blower control only works on 5, no heat.

you got two diff problems or more poss hvac control head, bad blower resister, bad thermostat, low on coolant, or plugged heater core

Posted on Oct 11, 2009

  • 2 Answers

SOURCE: 1997 pontiac grand prix gt,the heat and defrost

I had the same issue, however my blower motor did not work at all, heat or AC, it just did not work. It was the blower motor resistor. When I took mine out, it was brown and melted. Got a new at the junkyard for a few bucks. Works great now.

Posted on Dec 17, 2009

Testimonial: "i have ordered a new one from rock auto.com. and i am waiting for it now,how easy is it to change it out."

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Oct 15, 2015 | 2000 Pontiac Grand Prix SE

1 Answer

My 2000 pontiac grand prix heater gets warm but the fan doesnt work


Step 1:

check your owners manuel for the fuse box

Step 2:

Then look for the fuse and the color of it and the number on it for the right size and amp for that part of he car.

Step 3:

Than take a plasit puller to remove the fuse once you pull it look for and damage fuse for and break in the wirering. if you do see this than this is what you need so purchase that same part for a part store and ask them to install it for you and see if this solve your problem...that ask for their advise its free and alot of time they done mine........Talk to you La Da!

Jan 18, 2013 | 2000 Pontiac Grand Prix

1 Answer

Replace thermostat


follow upper radiator hose to aluminum housing this is where the thermostat is. be sure engine is cool remove radiator cap or reservoir cap if no cap on radiator disconnect upper hose from thermostat housing. remove two bolts in housing and remove housing. replace thermostat and reassemble. when finished refill anti- freeze leave cap off and start vehicle with heat on high. run the vehicle like this until air stops bubbling out of coolant and heat is hot steadily. continue topping off coolant during this process and be sure cooling fans engage before completion. then youre all done

Sep 19, 2012 | 2000 Pontiac Grand Prix

2 Answers

I have a 2006 pontiac grand prix 3.8l my heat only blow cold aair I checked the thermostat and the heart inlet hose is hot but the outlet hose is luke war what could this be maybe clogged heater core.


Ok fellow 2006 Grand Prix owners!! By trial and error, I went through the process of elimination because my car would over heat and had no heat inside. After changing the thermostat, I had to replace the water pump. However, after you do this, you need to open the inlet hose bleeder and let the air out a few times. This solved my issue of overheating and I now have great heat!!!

Oct 23, 2011 | 2006 Pontiac Grand Prix

1 Answer

My 2000 pontiac grand prix, the Engine temp heats up when at idle, returns to normal temp when at high speed and now it is almost at the overheating level whether i'm ideling or driving, Is it the...


The initial problem points to the radiator fan(s) not running at any road speed. Check the fan(s) for noise-free turning by hand. Check fan fuse and relay (swap with similar relay). Turn on the air conditioner which should immediately turn on the fan(s). Overheating while driving could very well be the thermostat--you will need to drain the cooling system before replacing the unit. Blow out the radiator core with compressed air from the engine side to remove bugs and other debris first. Hope this helps!

Oct 02, 2010 | 2000 Pontiac Grand Prix

1 Answer

2003 grand prix blower control only works on 5, no heat.


you got two diff problems or more poss hvac control head, bad blower resister, bad thermostat, low on coolant, or plugged heater core

Oct 06, 2009 | 2004 Pontiac Grand Prix

1 Answer

1996 Grand Prix SE, cooling fans inop


try the fuse,if not that the wiring is bad from the fan to the switch.

Jul 13, 2009 | 1999 Pontiac Grand Prix

2 Answers

No heat or cold air from vents


either bad blower motor or lose wire to blower motor.

Jun 13, 2009 | 2000 Pontiac Grand Prix

1 Answer

Heater blower motor only works on high on 2002 pontiac gran prix se-instructions on diy replacement i have the part. Heater Fan works occasionally on speed 5 only. When it doesn't work at all the lights...


for the fan blower motor it could be the resistor or the fan control speed control switch is bad.for no lights replace the DRL RELAY for the lights. for the heated seats check the fuses.

Jun 01, 2009 | 2002 Pontiac Grand Prix

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