Question about 2008 Pontiac Grand Prix

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Engine overheating, replaced cracked radiator w/new but problem persists, where is the thermostat located?

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  • Pontiac Master
  • 451 Answers

Should be on right side(drivers side) of plentum. Follow top radiator hose. Area is kind of hard to get to but is a real an easy change. After you change the thermostat then crank engine and bleed air using the bleed screws that are located in middle left of plentum.

Posted on Nov 21, 2013

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Posted on Jan 02, 2017

  • 118 Answers

SOURCE: pontiac gp 02 overheating

thermostat should be replace on over heated engine, the spring loses tension, probaly not problem, most like head gasket if over heated severly, if you have a air pocket & wornt purge thats one sign,press test on cold engine let sit at start up run slightly rough may see & smell coolant at tail pipe, could also pull plugs may have one wet all crude checks, there is also chemical you put in coolant & use a a stripe for combustion I think napa or snap on sells, alsoyou could do tear down & inspection wish you luck not sure what engine or car you have grand am or grand prix my guess a GP with poss 3.4 more likely then 3800 engine

Posted on Aug 31, 2009

alicantecoli
  • 22095 Answers

SOURCE: new pump, thermostat,full,bled,no heater,still runs hot

head gasket??

Posted on Dec 31, 2009

kel1guy2002
  • 3740 Answers

SOURCE: car overheating, blows cold air out vents, changed

A couple of things to check because as you describe your symptoms you actually have 2 problems

1. No heat from vents.

Sounds like the heater water flow valve cable is kinked disconnected or the valve itself is stuck You will need to follow your heater core water supply lines to find the valve usually to the right of the center console in the ducting area / large plastic housing for heater and AC internal coils. If the valve works then there is a possibility that the heater core water supply lines have been bypassed on the engine side of the firewall with a coupling due to a leaking heater core. And l;astly the heater core could just be clogged. (quite rare!!)

As for the overheating engine after all of the work you have done.. Perform this simple test.

1. remove radiator cap
2. have someone else start the car
3. watch for water coming out of the open radiator cap area DURING start...
4. have person in the car rev engine gently 2 or 3 times. No need to exceed 2000 RPM. If water rapidly flows out of the radiator during engine revs.. you have some major engine issues.
If it passes all of these checks then the only thing left is improper hose connections on the engine side of the firewall and or a hydraulic water lock in the block that should clear itself by starting and stopping the engine many times with the radiator cap off.



Posted on Jan 27, 2010

  • 1 Answer

SOURCE: sputtering sound out of the muffler and loss of power and hesitation out of the engine. any possibilities?

Sounds like the same problem I had with an old Jeep Commanchie, was catalitic converter died and was plugging exhaust, got sucked into a vave job by Lethbridge garage...Subway comes to mind for some reason.

Posted on Sep 21, 2012

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If the problem persists, then it's most likely gunk in the radiator. Auto shops can boil them clean.

Short of all of the above, overheating can also be caused by a cracked cylinder head. If it overheated too bad at any point, it can crack the head and will continue to overheat regularly. Check for antifreeze in the oil. If there "is" antifreeze or water in the oil, the head is most likely shot (and yes, it will still run that way).

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2, Remove the two bolts that hold the housing to the engine.
3. remove the thermostat and scrape off the old gasket and sealant from the housing and manifold.
4. install new thermostat (point side UP)
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More info to follow in my comments...

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