Question about 2002 Oldsmobile Alero

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Overheating after I fixed the blown head gasket

I just fixed the head gasket, replaced the thermostat but the car is still over heating the water pump is not leaking but temp red lines in ten minutes
should I replace the water pump? what else can it be please help.

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  • mosslanding1 Aug 04, 2008

    Nope I did not...I didn't even know that tid bit thanks
    but both fans are running in this case but no heat through the heater at all and runs hot for about 20 to 25 minutes then redlines
    I don't have the manual to know the proper way to bleed the coolant system of air... I will look around see if I have that on the haynes repair manual I bought

  • mosslanding1 Aug 04, 2008

    ill try that tomorrow see if it helps let ya know if its a fix by rating thanks

  • mosslanding1 Aug 05, 2008

    nope that was not it still overheats and the heater still does not work blows cold air but not as cold as before.

    so I checked coolant level and its all gone then I checked the oil and now there is coolant in the oil again

    its definitely a blown head gasket this I know

    looks like I botched the fix I used Blue Devil Sealant & it did not
    work very long or I botched the job... I have to start all over again

    I just purchased some Thermagasket and I am waiting for it to be
    delivered this may be the fix I need. my last hope before I take it to
    the $$$$ shop

    let me know if you have any other advise

    Thanks for your help

  • ionmike Aug 18, 2008

    I have a 2001 alero. I was driving it and it got hot. It got really hot. I had it towed to the shop. The mechanic said head gasket was blown. He put new head gaskets in, replaced all of the hoses and the water pump. Picked the car up, drove it 5 miles and it started overheating again. Had it towed back to the shop, mechanic said the head was leaking again. This time he said he replaced the head. ( the back head) Still got hot, fans are coming on, hoses are new, water pump is new, thermostat was repaced twice, so he said the radiator was clogged. He put in a new radiator, I picked the car up this time I got about 20 miles and it got hot again. What is left that hasn't been replaced? The car is back at the shop( by way of tow truck) and the mechanic says he did a co

    mpression test and it seems that the back head is leaking again. Is this even possible. What could be causing this?

  • mosslanding1 Aug 19, 2008

    Never got that far yet but the car is going into the shop for the blown head gasket I paid 260 dollars to get this fixed on my own and was NOT successful water in the oil milky creamy color drained the oil
    4 times now changed oil filter three time and added Thermagasket
    to repair head gasket the product was a 94% fix ratio money back guarantee it did NOT work lets see if I get my $154 back I followed all the steps but still have water in the oil its bad real bad I say get a new engine all together seems like this is a common problem with
    sounds like they did not replace the head gasket they just used a sealant instead and that does not work on aleros. ask them to show you the blown gasket if they really replaced it

  • yadayada
    yadayada May 11, 2010

    Dis you properly bleed the cooling system of air as outlined in the factory service manual?? If you didn't this will keep the cooling fan from coming on, and the thermostat from working correctly. all of which will cause overheating



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Raise the front of the car as high as possible with a jack then run the engine and leave the radiator cap off, the air in the system should go to the high point which will be the radiator, don't over heat the engine, after the system is warm put the cap on and fill the recovery tank all the way up, run until it starts to get hot turn if off and leave it up jacked up well it cools, running a hose on the radiator will speed this up. This should cure the bleeding issue or really help.

Posted on Aug 04, 2008


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What could cause my car to over heat when I replaced my water pump and thermostat

Hello Martin, I have seen someone install a thermostat upside down . This causes the thermostat to not open . Was the engine overheating before you replaced the water pump and thermostat ? If the engine has been excessively overheated, this could cause a blown head gasket .

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Replaced the thermostat and water pump and still overheating the gage inside indicates heating and says turn off engine, what else could it be

You may have a blown head gasket or cracked head....when this happens, the coolant is super heated causing the fault discribed. have it checked out...good luck

Feb 07, 2011 | 2006 Chevrolet Impala

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Jun 02, 2010 | 1998 Cadillac DeVille

5 Answers

Overheating all the time

First, anytime a thermostat is overheated, it's ruined.

Second, if this car has electric fans, are they running when they are supposed to? If not, replace the fan control module, and/or test/replace the fan motors.

When the radiator was replaced, were you certain to purge the radiator and engine of all air before replacing the radiator cap? When you refill an emptied system, you always start the engine and watch the fill level in the radiator, refilling as necessary until you know the thermostat has opened. You need to have the heatrer controls set to full hot as well. Once the radiator is filled, put the cap in place, and fill the reservoir to the level indicated for a hot engine.

Finally, check to make sure the lower radiator hose is not collapsing while driving. While this is difficult to check (because your going down the road), just replace it when you replace the thermostat.

All of this assumes you do not have a cracked head or blown head gasket.

Dec 18, 2009 | 1992 Toyota Celica

2 Answers


This could be a multitude of things:

Stuck closed thermostat.

Cooling fan not coming on.

Clogged radiator.

Low on coolant.

Water pump failing/leaking.

Head gasket blown, leaking exhaust into antifreeze.

Clogged catalytic converter.

Thermostat: If the Van heats up, then feel the upper radiator hose. If it's cold, then your thermostat is closed. Replace thermostat.

Coolant: If low, simply fill with distilled water and coolant. Low levels will let engine over heat.

Radiator: If there are cold-to-the-touch spots on the radiator after it should be warmed up, then a clogged is probably occuring. Have radiator flushed.

Head Gasket: If you smell exhaust fumes in your coolant reservois tank, then you got a blown head gasket.

Cat Converter: Only can be tested if off the car. Or you could try a non-contact thermometer. These are also good to testing cold spot on radiator or if thermostats are open.

Cooling fan: If mechanical it'll be spinning. If electrical, it should come on automatically with the A/C, or when it gets hot.

Water pump: Will be leaking from the front if it needs replaced. On a van, it's a tough job.

Good luck!

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