Question about 1997 Pontiac Grand Am

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Is car engine ok without thremostat

Engine overheating can't find problem or just remove the thremostat

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Have you considered power flushing the block to remove buildup of oxidation which insulates and holds heat? I assume you have replaced the thermostat with no results. There are opinions about operating with not thermostat. Some say it prevents the engine from reaching operating temperature and therefore is running ineffectually and won't meet emissions.

Posted on Mar 20, 2014

  • John Stanley Mar 20, 2014

    The above comment is all valuable, but running your vehicle without the thermostat won't hurt the engine of older vehicles and I don't think it will be an issue for your 1997 either. I have to agree with the other guy to flush the system, check water pump & radiator for leaks? Worst case is check your oil for water bubbles or condensation coming from exhuast pipe, you could have a bad head gasket.


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No, definitely not! I do not recommend running the vortec engine without it because it slows down the waterflow giving time to cool as the coolant circulates. I also watched my sister and husband blow one up by doing that. I did a good bit of research after that and found several cases of the same and GM also gives warnings of damage to the engine.Always use a new thermostat and make sure the fan relay is working.

Posted on Mar 21, 2014

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I don't want to get into a He said / He said here but the thermostat also serves to control the flow of water through the block. If you want to run without, get some side cutter pliers and remove the centre part that opens. Refit the remaining outer ring and this will act as if the thermostat is fully open. If you run with nothing in there it may prevent the engine reaching correct temperature as mentioned elsewhere or it may induce overheating by allowing the water to pass too quickly through the rad.

You need to establish the cause by other checks. When hot is the rad hot all over side to side and slightly cooler towards the bottom?

Are the large hoses to the rad hot upper and cooler below?
Does the heater blow hot? It may be blocked. Although this is a separate defect.
Has the vehicle been properly serviced from new with coolant/antifreeze at all times? Any time longer than a week without antifreeze or summer coolant in the warmer states will start a process which will clog the heater and main rad. If this cannot be confirmed the only way to ensure cooling is to fit a new rad after a thorough flushing with rad removed. Modern aluminium rads cannot be cleaned to a worthwhile standard. The comment about head gasket also applies, running without coolant will corrode the gasket material. Are there bubbles in the header tank with cap removed on initial startup? Don't do this when hot!!
I know it sounds crazy but I've had a Hilux that had been running without coolant and the steel water pump impellor was completely corroded away, so the water wasn't circulating. That one took a bit of working out!!

If fitting a new rad solves your problem make sure you run with a thermostat and antifreeze because low water temp can bring about all sorts of other problems which get your smog system all worked up.

Posted on Mar 20, 2014

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if the radiator is cold or cool then the thermostat is not opening or there is no coolant in the radiator or block
I'm thinking a faulty thremostat

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Is engine ok without thermostat

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I have a Peugeot 607 2.2 petrol of 2004 which kept overheating but upon removing the thermostat in the engine(close to the brake servo) the overheating stopped and the fan works normal.the car was imported...

There are different thermostats for different climates,
You will need to get the right one from a local dealer,
Thermostats regulate the flow to get the engine temp to the optimum performance level,
A engine without the thermostat takes longer to warm up to operating temperature, so that will cause a lot more wear on the motor, especially in cold weather conditions!
Cheaper to replace it than a engine
Cheers Frank

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If the car overheats is it cause the alternater?

No. its either radiator , engine cooling fan, coolant leaks, thremostat, or worst headgasket. Acura are popular for radiator being broken at the seam of the radiator.So check for leaks, now if the cooling fan doesnt come on the yes it will overheat, so the operation has to be monitored a engine cannot go pass 215 F there it can be damage, now the thermostat need to open at a cerain degree . or it will cause overheating and not allow cool fluid to enter the engine area. and the radiator cap must be able to sustain a certain pressure in order to keep the car from overheat, water boils at 110 F so a radiator cap rated for your engine must be specification for every one pound of pressure it increase the boiling point 10 degrees. 210 is fuel control you should not exceed this temperature. radiator are popular for getting plugged internally.

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Thermostats are a necessary element and they allow hot coolant into your heater core. I would replace it with a dealer supplied one.
You will ruin your engine if you operate without it.

If this doesn't work have the system flushed as a last resort. Pay a little more to have a dealer do it. Well worth it.

They will also check your rad cooling ability as well ad your heater core.

Dec 31, 2009 | 1995 Ford Taurus

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The coolant thermostat is mounted on the engine, see part 16 on the following diagram:


Do not forget to rate the support given.


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If the car is overheating it could be due to a thermostat which is stuck in the closed position, a failed water pump or just a slack belt driving it. I think there will be a "little" tube carrying coolant from the engine to the coolant expansion tank, and if you run the engine with the filler cap removed you should see water coming through that pipe IF the rump is running. A failed water pump will not necessarily leak, it just won't pump the water round the engine.

Always take care when dealing with a pressurised cooling system on an overheating engine - the water may well be above boiling point.

If you run the engine without coolant the cylinder head may well warp and repair bill will be huge.

Hope this helps you a bit. D

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