R33 Overheating

[MAS_R33]

Hi guys,

My r33 gtst has recently started intermittently overheating.

It is completely random. Sometimes, it can drive for days being fine whilst other times it will overheat immediately.

when it does start to overheat I can stop the car, let it cool down and then its fine to go again without overheating.

Only appears to lose water when it overheats and comes out the reserve.

I've tried another thermostat..... still the same. Any ideas?

[SkudR33]

Never had this problem myself in a skyline, but my run around (shitbox) honda integra used to have that problem - turns out there was an electrical issue in which the fan would randomly (& intermittently) stop working.

Good luck with it

[StevenCJR31]

Sounds like a borked thermostat

[Ben C34]

Have you bleed the cooling system after changing thermostat?

[Humbla]

Try a new radiator cap,i change mine every 2 years.

[Sklyn]

Is it just random, even at low speed?

Do you still have the original radiator?

It is getting old so I'd say replace the radiator.

Mine would start to overheat when driven at 100km/hr. Went through the steps and once radiator was replaced all good.

[MAS_R33]

Thanks for the replies!

So far:

New Thermostat hasnt changed anything

New radiator cap hasnt changed anything

The electrical fan appears to be working

Not the original Radiator - It got replaced a few years ago

I happens randomly so Its got me stumped

[89CAL]

Does the car still have the standard belt driven viscous fan hub?

Is the radiator full of coolant when the car is cool?

When was the water pump replaced?

Is the belt intermittently slipping?

[Sklyn]

all the hoses in good condition. If they are brittle or had crap build up inside, could then cause blockages.

What condition was the coolant in when you first changed it?

[StevenCJR31]

What brand thermostat? Genuine is the most reliable

Aftermarket ones dont seem that good IMO

[Dan_J]

do you find that you need to top up coolant every now and then ?

might be a pin hole on heater hose and it will only piss out when the car is hot/up to temp

[MAS_R33]

thanks for the replies.

All work done professionally by a mechanic (not me!) so quite a few things checked.

Thermostat is genuine Nissan.

All (or if not most!!) hoses have been replaced

Yes still has the standard clutch fan

I've never done a water pump in it

[89CAL]

O.K. How many km has the engine done?

Highly doubt its the water pump, especially if the teltale isnt leaking but have to ask anyway

Does it need coolant ever?

Have you measured the temperature with a temp gun or something like that? Just in case the sensor is a bit funny and giving false readings

Edited October 21, 2013 by 89CAL

[sammi_d]

Not to hijack the thread, but I've had overheating issues lately too..

When I'm on the move, the car is fine, but when I'm stopped, that's when it can overheat (and the temp jumps up pretty quickly)... And it happens randomly too!!

Found a whole lot of shit in the radiator fluid and overflow bottle, so I had the radiator completely flushed and the fluid replaced... Any thoughts??

I'm thinking maybe water pump, hoses or fan.. Anyone have any similar issues that can give some advise/insight??

[Plattsy]

next step is to get the radiator rodded guy.

[89CAL]

Not to hijack the thread, but I've had overheating issues lately too..

When I'm on the move, the car is fine, but when I'm stopped, that's when it can overheat (and the temp jumps up pretty quickly)... And it happens randomly too!!

Found a whole lot of shit in the radiator fluid and overflow bottle, so I had the radiator completely flushed and the fluid replaced... Any thoughts??

I'm thinking maybe water pump, hoses or fan.. Anyone have any similar issues that can give some advise/insight??

If its overheating when its stopped and not overheating when its moving, then wouldnt the logical problem be the radiator fan? Seen as you have had the radiator serviced this is pretty much all it can be. The fan doesnt do alot when the car is moving, when the car is stopped the airflow accross the radiator is created by the fan

[sammi_d]

If its overheating when its stopped and not overheating when its moving, then wouldnt the logical problem be the radiator fan? Seen as you have had the radiator serviced this is pretty much all it can be. The fan doesnt do alot when the car is moving, when the car is stopped the airflow accross the radiator is created by the fan

Yeh I know, and that's what I thought.. When I took it to my mechanic a second time to check it out with me, it was fine.. One of those "does it when no one is around, and doesn't do it when u want it to" kind of things...

Just thought I'd post up incase it could be something else.. Probably best thing is to just sort out the fan regardless..?

[KiwiRS4T]

Yeh I know, and that's what I thought.. When I took it to my mechanic a second time to check it out with me, it was fine.. One of those "does it when no one is around, and doesn't do it when u want it to" kind of things...

Just thought I'd post up incase it could be something else.. Probably best thing is to just sort out the fan regardless..?

Well if you haven't done the radiator in recent years take it out and get the top taken off and either clean it out or get a new one if necessary. If its getting blocked it will still work better with a 100km breeze going through it than when stationary.