Overheating Problem

[SauRoNZA]

I don't think there's anything wrong with the gauge.
The mechanic doesn't know what he's doing.

I think it's either the fan or there's too much antifreeze in the coolant.

I seem to recall if you run the engine with the radiator cap off it can resolve the problem of any bubbles in the system.

But I might be remembering wrong.
[MENTION=15693]Sinbad[/MENTION] can probably confirm.

 

[dillinger]

If you are going to driver the car for the week like that and take it back to your mechanic over the weekend it will not end well.

Utter BS that the gauge has to calibrate its self, I work on big industrial engines and if I change the engine control system I sometimes need to enter the curve of the water temp and oil pressure switch. We are talking of a 2001 Toyota here that has hardly any electronics in it.

You said your mechanic worked on the cooling system why and what did he do?

Make sure that the fan works, start you car and let it idle, watch the temp gauge, fan should come on within 10min, if it reaches 3/4 on the gauge and the fan has not switch on switch off the motor. Something wrong with the fan switch, slave relay (if fitted) or fan. Go and feel the top radiator hose and then go feel the bottom radiator hose. If its hot at the top and cold at the bottom then there is no water circulation, this could be a faulty thermostat, radiator, water pump or radiator cap. On a correctly working cooling system the temperature difference between the top and bottom radiator hose is no more then 2 to 3 deg.

 

[therealace]

I'm not sure about calibrating a 2001 corolla gauge, but check your water pump for a leak!

 

[Zuner]

So much crap info in this thread.

^This.

 

[TheChamp]

If you are going to driver the car for the week like that and take it back to your mechanic over the weekend it will not end well.Utter BS that the gauge has to calibrate its self, I work on big industrial engines and if I change the engine control system I sometimes need to enter the curve of the water temp and oil pressure switch. We are talking of a 2001 Toyota here that has hardly any electronics in it.

You said your mechanic worked on the cooling system why and what did he do?

Make sure that the fan works, start you car and let it idle, watch the temp gauge, fan should come on within 10min, if it reaches 3/4 on the gauge and the fan has not switch on switch off the motor. Something wrong with the fan switch, slave relay (if fitted) or fan. Go and feel the top radiator hose and then go feel the bottom radiator hose. If its hot at the top and cold at the bottom then there is no water circulation, this could be a faulty thermostat, radiator, water pump or radiator cap. On a correctly working cooling system the temperature difference between the top and bottom radiator hose is no more then 2 to 3 deg.

I agree, you might regret not sorting it out. An overheating car and traffic is not a good combination.

 

[Sinbad]

If it heats up while standing still, airflow problem. If it heats up while driving, water problem.

Check radiator fins are not clogged with debris and/or bent. Check that the radiator fan starts up. Fuse first, then relay.

 

[bandooq]

1. Check if the engine fan works. If it does not come on then -
.........a- Check the fuse or
.........b- Remove the connector plug and give it clean up or
.........c- The thermostat is faulty

2. Leave the radiator cap open to remove air bubbles and check if water is flowing, if not then -
.........a- The water pump may need to be replaced or
.........b- There is a problem with the thermostat

 

[c3n0byt3]

If it heats up while standing still, airflow problem. If it heats up while driving, water problem.

Check radiator fins are not clogged with debris and/or bent. Check that the radiator fan starts up. Fuse first, then relay.

This is generally the issue on those corollas.
Had one and same thing.
The radiator eventually does need to be replaced.
Or you can risk overheating/blown head gasket.

However you also seem to think the engine is not overheating.
Or rather you can't be sure because the mech said the gauge is misreading.
Without the gauge I'm not really sure you can tell if it's overheating or not until it's too late.

 

[namzsteve]

Get this looked at ASAP before you have bigger blown head gasket problems.

Investigate why the fan is not working, could be electrical connectors not connected. My number 1 issue could be the thermostat, could be on the way out.
Someone has mentioned an air thing, as the car moves there is air passing through the grille which helps cool down the radiator hence your car cooling down when it's driven.

I'm not sure about the possibility of air in your cooling system but could be possible if they just put it in without bleeding the system and don't let people tell you that doesn't do anything, trust me it does.

 

[TheChamp]

Get this looked at ASAP before you have bigger blown head gasket problems.

Investigate why the fan is not working, could be electrical connectors not connected. My number 1 issue could be the thermostat, could be on the way out.
Someone has mentioned an air thing, as the car moves there is air passing through the grille which helps cool down the radiator hence your car cooling down when it's driven.

I'm not sure about the possibility of air in your cooling system but could be possible if they just put it in without bleeding the system and don't let people tell you that doesn't do anything, trust me it does.

My car does not have any bleeding mechanism, i've drained the radiator multiple times and I just put in new coolant and i'm good to go, I assume it does the bleeding automatically?

 

[TheChamp]

This is generally the issue on those corollas.
Had one and same thing.
The radiator eventually does need to be replaced.
Or you can risk overheating/blown head gasket.

However you also seem to think the engine is not overheating.
Or rather you can't be sure because the mech said the gauge is misreading.
Without the gauge I'm not really sure you can tell if it's overheating or not until it's too late.

Why would the gauge suddenly stop misreading when the car is moving?

 

[qscwbt]

Check the following:

Is there sufficient water in the system?
Is the system properly filled and bled with no air pockets?
Check if fan is working by connecting it to a battery.
Test and confirm the fan switch is working.
Thermostat and water pump would be last resort to check.

 

[Barbarian Conan]

I had a strange overheating problem with my 1997 Toyota Tazz. About 15min into my commute, round about when the hilly section of republic starts, it would start to overheat when I stop, going from halfway to the red in less than 5 seconds. It would sometimes go down to halfway when I start driving

After multiple visits to the mechanics, the problem was isolated to the gauge wire insulation being worn (or eaten by rats or whatever) and it would short when pressing against something or being clamped by the clutch operation? I can't remember exactly what as it was a long time ago.

 

[Pitbull]

Hello

I took my car for a service yesterday (Toyota Corolla 1.3l, 2001 model).
They replaced the coolant amongst other things.

Now I have a new problem, the car overheats at standstill (temperature gauge goes into the red region), although it cools down when driving.

The radiator is filled with coolant, so the problem is not the coolant level.

Why is the car overheating at standstill?

Stop fiddling with it and driving it. Take it back to the people who did the service. Having it overheat can blow a head gasket and then you have more issues. They farked it up, they must fix it. Not your problem...