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Help please Over heating still - '01 Grand Am

tiggerlbtiggerlb Posts: 2
edited March 2017 in Pontiac
My 2001 Pontiac Grand am will over heat where the red light comes on and then at times it will just run very high temp a few marks before hitting the red line on the temp Gage. My heat blows hot when I am on the express way then it will blow cool on normal roads. When I turn the car off I have coolant spew from the over fill hose on the resivor tank. I have checked for leaks other than it comming out the resivor over fill tank hose there are no other leaks.. It will also boil in the resivor tank at times. My cooling fans do kick on but only when my gage reached about 3/4 of the way up. the air from them seems to be blowing on the motor and not towards the radiator. I have had the car 1 yr and only stated having this problem with overheating. So far I have replaced the thermostst. What else should I look at ? I was thinking temp sensor possible. Thoughts please

Answers

  • ray80ray80 Posts: 1,655
    Kind of sounds like it may be low on coolant, have you checked both reservoir and radiator? Are there bleed screws to get air out of system?
  • Mr_ShiftrightMr_Shiftright Sonoma, CaliforniaPosts: 64,490
    Yes your fan should suck air from the radiator (through the radiator actually, from outside the car) and push towards the engine. So that is working as it should.

    Have you inspected/tested the thermostat yet?
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 24,246
    tiggerlb said:

    My heat blows hot when I am on the express way then it will blow cool on normal roads.

    That says to me that you're getting air into the heater core. At low water pump/engine speeds not enough hot coolant is going through. The air could be combustion gases from a head gasket leak or other leak letting
    combustion gases into the coolant.
    tiggerlb said:

    When I turn the car off I have coolant spew from the over fill hose on the resivor tank.

    That says it's overheating. So your temperature sensor is not likely the problem.
    tiggerlb said:

    It will also boil in the resivor tank at times.

    That says to me you're getting combustion gases into the coolant if the reservoir tank is acting like it's boiling and the bubbles you think are steam are actually exhaust gases from head gasket problem or worse leaking into coolant and escaping into the reservoir and then venting to the outside.
    You need to have the coolant checked for combustion gases at a shop.

    What does the coolant level look like when the car cools? There is a procedure for refilling the cold engine with coolant to expel air from the heater core. If you have a dropping coolant level after driving and experiencing the heater being cool at times, you likely have a combustion leak. Do you hear rushing water sounds when running the engine at idle or if you rev it up to 2000 or 2500? That indicates air in the heater core.

    The 3100 engine has had it's share of failure points. How many miles are on this puppy?

    2014 Malibu 2LT, 2008 Cobalt 2LT, 2015 Cruze 2LT,

  • Mr_ShiftrightMr_Shiftright Sonoma, CaliforniaPosts: 64,490
    You can buy a simple kit at an auto parts store that tests for combustion gases in the coolant.

    Yes I think the 3100 engine has a problem with intake manifold gaskets causing coolant intrusion into the oil. Very common, so have that checked out.
  • You said the air blows hot on the expressway and cool down city roads? If so then you most likely have a blocked heater core. Very common problem. Take it to a ready rad or your mechanic and tell them to flush your heater core
  • tiggerlbtiggerlb Posts: 2
    I ruled out the heater core all together I by passed it. The car can sit in park and idle for an hour + with out overheating but then just a short trip around the block it is over heated. and back spewing water out the over fill hose on the resivor tank. I am leaning towards a bad head gasket or a warped head. Even though there is no a single bit of the normal signs of this like white smoke from the tail pipe or the milky looking oil. This car is not meeting any of the traditional signs. I have put the car up till next tax season when i will have the money to fix the major issues. I did go out and buy another grand am a 2004 for the mean time. I like my 2001 grand am GT best because it has the sportier feel and look it is also the wide track. It feels much better to me to drive than my 2004. Thank you ll for taking the time to answer my question.
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