60v6 98 malibu running without thermostat

[ma7amad]

hi
my car is chevy malibu 98 3.1 l engine

i have removed the thermostat completely the result as following

in city driving at less traffic or stop signals the temp. gauge at middle or just less, while heavy traffic and bumper to bumper driving temp. gauge start to move slowly to up ( which improvement than before with thermostat temp. go up quickly ) until the cooling fan start at the 2 slashes over the middle slash

at highway temp indicator set at first quarter of the dial or above by two slashes depending on the temp outside here in middle east and gulf area almost warm and average 45 c in summer time.

my question is it wrong to drive on highway with temp gauge reading at quarter of the dial. anybody try it before ?

[Kaos]

my car idles at almost the 3/4 dial mark and when driving at highway speeds it drops to the 1/2 mark but either way the car will not make heat. I have to check my thermostat and then try to bleed system again

[SappySE107]

Tune the computer to turn the fans on sooner, and thats it. If you hate your motor, keep running it with no stat.

[Superdave]

^Agreed Put the thermostat back in. These engines are designed to run best between about 190F and 220F.


I'm sure Dubai is pretty hot, If your car is consistently overheating (240-260+) then maybe try a 180F thermostat and add a pusher fan in front of the radiator if you have room.

[ma7amad]

thanks everybody for appreciated response i attached this photo to show the temp gauge reading while i am driving at 120 km/h and ac on the temperature regulate just two slashes to the normal operating temp the issue which i think it shall not affect the engine health like when we run the car at cold start it takes long time to reach to middle of range and if we go through highway driving it also show the less than operating temp. the different between the two photos only the outside temp. 1 st photo ambient temp was 19 c at early morning the 2 nd was 34 c at middle of today.
later in june to sep it well stay at 45 c so i will never run colder than this measures which i think the engine can afford or feel happy with running colder.

[carbon]

later in june to sep it well stay at 45 c so i will never run colder than this measures which i think the engine can afford or feel happy with running colder.

No you don't understand... the engine is happy at a STEADY 90°C not a constant 45°C-115°C swing. The thermostat serves a purpose, as mentioned above, if you don't like your engine feel free to leave it out.

[3400-95-Modified]

If your car can not regulate the temp for what thermostat is installed then I think you have another cooling issue somewhere else.

[robertisaar]

If your car can not regulate the temp for what thermostat is installed then I think you have another cooling issue somewhere else.

this is what sticks out most to me.....

if cooling fan 1(or in this case, low fan speed) can keep it from rising further, i see nothing wrong, the system is working exactly as expected.

if fan #2(or high speed) has to happen to keep coolant temps under control...... that can still be normal depending on ambient temps and road conditions.

but if it can't be controlled at that point, something is seriously borked.

[3400-95-Modified]

I say this assuming of course the vehicle is in stock form because the cooling system that was designed for it was designed to be adequate enough to cool the engine in place.

[SappySE107]

There is no issue other than he thinks there is because of what the needle reads on the gauge compared to whatever it is he thinks it should be reading. A simple reflash for coolant fan temps would solve all of this.

[Kaos]

Lol


Sent from my iPhone using Tapatalk

[3400-95-Modified]

There is no issue other than he thinks there is because of what the needle reads on the gauge compared to whatever it is he thinks it should be reading. A simple reflash for coolant fan temps would solve all of this.

100% correct

[ma7amad]

the problem is the cooling fan stopped trigger in at suitable time as it used to as i remembered the RIGHT HAND fan was regulating the temp. to keep it around the middle mark many time i raised the bonnet up and saw it spine but suddenly i do not remember when ( once upon a time ) this function stopped but i did not noticed because we almost use ac.
malibu dose not have any of odds that mentioned above ( engine flushing periodically every summer, new radiator with wider fins, new thermostat new water pump no any restriction in coolant flow as it locks during flushing procedure ) if it has any it shall also overheated on high speed or freeway without thermostat installed also. that function stopped by the ECM itself as i reviewed the cooling fan logic. this problem i can overcome by control circuit which i already did but still not installed yet because it is hot now here and i am using ac so fans always on.

the car run great and MPG very good i believe that i am not better than GM engineers who design this great engines but really i am not convinced that this 2 slashes under the operating temp. will affect in the engine performance or its life span.

all of car users running there cars under operating temperature for long time specially at cold start in morning time without any problems.

[ma7amad]

there is many things i don't understand like how control status or function stopped itself without intentionally programmed to do that i mean how the PCM will tell the fans to stop engaging until the customer visit GM dealer to reprogram and pay some money, the PCM in any car running some output as a result of receiving some inputs that is the engine management system function. it dose not mean that car manufacture will put some bugs in program to work in specific time for recall.

u know most of people here prefer japanese brands specially this holy toyota i don't know why may be because of some problems less like overheating or air conditioning but i am happy with that as i can own porsche with affordable price.

[SappySE107]

How about...no.