Car Getting Too Hot

[FATGTS-R]

Hi guys,

This is my situation. My car takes a very very long time to get up to operating temp. It never used to do that.

During the colder months it can take over 10 minutes or 10kms to get close to a quarter on the gauge but it didnt overheat.

Now that the weather is warmer it is still taking way too long to get to temp but when it does it just keeps climbing. Sitting still in traffic on a warm day it can peg 95 degrees according to ecu. If I sat there on the spot and bring the revs up it would drop it a couple degrees.

Today in Vic it was warm again and it got hot. Popped the bonnet to let some heat out when I got home and pulled the throttle to see if I could hear the clutch fan engaged. The fan engaged fine untill I noticed that the lower radiator hose was being sucked flat!!

This wasnt at high rpm either, jiust a quick flick of the throttle would have it collapse.

Now I assumed that the radiator must be blocked. But the radiator was recoed around 20,000kms ago and also if the radiator was blocked wouldn't it get to operating temp very fast rather than very slow?

The other symptom it has is that after shutdown I can hear a "gulping" sound through the system but I have flushed and bled the system many times and never been able to get rid of it?

Obviously, I will be replacing the lower hose with a new one but could all the above symptoms be caused by a simple rubber hose thats too old?

thanks in advance.

[BANGN]

First things first, replace all the other water hoses on the car as they are now pretty much cactus since its gotten hot otherwise one by one they will split over time and cost u money in tow's home.

secondly if water is not getting through the system its not going to be able to read temperature properly, IE no water in the system is going to read low or mid temp until it gets a bit of water through and WAM temp gauge goes up fast.

I would be replacing that hose for starters and replacing your thermostat, aftermarket thermostats jam shut where as genuine thermostats jam open and could be shut to the point its creating vacum in the system. That hose must be really screwed however to suck inwards that much.

if water takes a long time to flow through the rad its an indication its blocked but since u have reco'd it I doubt thats the case.

are you loosing water at all?

[FATGTS-R]

No,not losing a drop of water.

And I researched a little and saw the common signs of water temp rising slowly and then a rapid jump or just fluctuating all over the shop when theres air in the system but I've had my other half drive the car with me in the passenger seat with laptop watching the temp rise and its definatley a linear rise in temp.

But I agree re the hoses, I've already organised getting a new set right through along with stat and also a bigger radiator. Hoping problem will go away but really just want to know for knowledge sake whats caused the drama.

[Sandeep]

i think your radiator will need to be flushed and "rodded" (they will pull the tanks off and push metal rods through the core to push out any blockages in the core).

[BANGN]

ur lucky RB motors can take alot of heat motor shouldnt have a problem but yeh anything else and throw away the motor..

[rgr34]

i would be changing the thermostat, flushing the coolant and getitng the radiator flushed/cleaned by a shop just in case its blocked. do the cheap things mentioned first hopefully fixes the problem.

[(OO)SKYLINE(OO)]

If your radiator hose is flattening, change it to a metal hose.

[FATGTS-R]

Pulled the cap off yesterday just when I beleived the thermostat should be opening and looking into the core it seems to be flowing well?

Also looked at the laptop whilst I cracked the throttle and at a lowly 2200rpm the pipe is flat as a pancake which is a worry.

Have organised new pipes and thermostat so will start there and see what happens. Hopefully its just a perished rubber hose. If its the same hose as fitted by factory then its 21 years old and could do with a change.

Re the metal hose...wouldnt it just crack as the engine moves around?

[BANGN]

metal hose is a silly idea. It seems weird that its sucking in tho as its ment to be pressurised