Temperature rising on hills

GTO · Post by **GTO** » Mon Mar 03, 2008 10:30 am

I went away this last weekend I noticed when climbing a steep pass at +/-100kmh that my temperature gauge started to climb above half and up to about 3/4 high on the gauge.When I started going down hill again it went back to normal.It did the same on the way home,near Malmesbury there was hill after hill it just wouldnt go down,I stuck the heater on which immediatley brought it back down to its normal position just below half.The strange thing is at slower speeds on the gravel roads climbing very steep hills it never moved from its normal position?When I got to Cape Town and started climbing Ou Kaapse Weg I decided to switch the heater off I made it all the way up without the gauge moving?When I changed the coolant last year I noticed the drain plug on the block was blocked,I had to stick a screw driver down it to unblock it.So I am thinking that there is maybe a blockage somewhere so this weekend I going to stick some radiator flush in the system.Does anyone have any ideas?

Bushwacker · Post by **Bushwacker** » Mon Mar 03, 2008 2:58 pm

I had a problem like this with SWAMBO's ex Honda Balade. It was a blocked radiator.

Post by **CasKru** » Mon Mar 03, 2008 4:49 pm

Could be an airlock as well. I remember my dad once had a problem with his corolla which suddenly just had the temp shoot up after refuelling. We then realized the petrol attendant removed the radiator cap instead of reservoirs cap to check the water level. May be the same happended to yours. All we needed to do was to open the radiator cap and while ideling, add water till it took no more water (this happened +- 15 years ago and I'm not 100% sure if this is all we had to do)

Maybe while you're at it. Check the seal on your radiator cap if the rubber is not perished by any chance. m2cw

GTO · Post by **GTO** » Mon Mar 03, 2008 5:08 pm

Yesterday I ran the car with cap off to check if there circulation and a few bubbles came out.If there was an airlock would a few or a lot of bubbles come out.There are no leaks,so if the radiator cap was the problem can it actually suck air in? I have never changed the cap,the vehicle is almost 13 years old the only part of the cooling system that has been changed is the water pump(4 years ago) and I change the coolant every 2 years.Someone said to me it could be the fan,the workshop manual I have says it should have a slight drag on it if you turn it by hand which it has.I think I am going to try adding a radiator flush to system only problem is I'll have to wait till I do another long distance trip to see if it does it again.Today I did 60kms around town in traffic and uphills and the gauge never moved of its normal position.

Post by **CasKru** » Mon Mar 03, 2008 5:13 pm

If your vehicle is 13 years old I would defenatly replace the radiator cap if I were you. I had a problem with a conquest which I owned (1987 model) where the water would start boiling when I shut the car of. I had the problem for a few years and tried many different things to solve this. I eventually replaced the radiator cap and problem solved.

gbogh · Post by **gbogh** » Thu Mar 06, 2008 8:43 am

Is it using/losing water? Worst case scenario, could be a cracked cylinder head.

Knersus · Post by **Knersus** » Thu Mar 06, 2008 8:55 am

Guaranteed that your radiator will be blocked. Had the same problem with my previous bakkie and 12 cores were blocked. Take it to a radiator service centre and let them remove the top tank and clean it. You will be surpriced what gunk is comming out of it. Remember to put in the red antifreez mixture when filling it up again.

SuidWes · Post by **SuidWes** » Thu Mar 06, 2008 11:03 am

Why the red one

:?

Umvubu · Post by **Umvubu** » Thu Mar 06, 2008 11:12 am

Most Toyota Dealerships use the red anti-freeze. :D

ThysdJ · Post by **ThysdJ** » Thu Mar 06, 2008 11:16 am

To prevent this Jaco!

I dont know the diffs between the red and the green, but the green looks really really psychadelic funky and extremely drinkable..

SuidWes · Post by **SuidWes** » Thu Mar 06, 2008 11:32 am

Sure, I understand why antifreeze is important but have heard elsewhere that one should not use just any antifreeze and that different types should also not be mixedâ€¦.

Which one is the best?

ThysdJ · Post by **ThysdJ** » Thu Mar 06, 2008 11:48 am

SuidWes wrote: different types should also not be mixedâ€¦. Which one is the best?

I have also heard that, and I am also curious about that. Is there any slimkop out there that can enlighten us

We usually put that green stuff in...

Knersus · Post by **Knersus** » Thu Mar 06, 2008 12:56 pm

Well good question WHY THE RED ONE

A toyota fundy friend of mine told me only to use the red anti freez for a toyota engine :? To be honest it just might be a sales gimmic but the red one's is provided by the dealers so there might be some truth in the story. On the other hand I do know that the rust prevention liquid inside the anti freez is actually the thing that is working for us to prevent rust inside the engine that will corrote everything. So why it is red or green I am not really sure why the red one's is recommended

Umvubu · Post by **Umvubu** » Thu Mar 06, 2008 2:28 pm

I'm using the green one now for many years and no problems with it yet.........

Doctor V · Post by **Doctor V** » Thu Mar 06, 2008 2:41 pm

Mine did the same and replaced the radiator. No more probs. And a recore cost the same as a new one

GTO · Post by **GTO** » Thu Mar 06, 2008 4:05 pm

Today was hot in CT was driving in traffic and uphills temperature gauge never moved from its normal running position.Does any one know how good radiator flush additives are?

Borntofish · Post by **Borntofish** » Fri Mar 07, 2008 11:14 am

A couple of things that I learned. If you have and ARB type bumber fitted is reduces the airflow to the radiator by about 30 percent. Do not fit Oem Thermostats. The one from Toyota has a 25% bigger diameter for flow than the Autozone specials. I removed the radiator and had it recored with a 3 channel core from Silver radiators. No need for modifications of the tanks.

With regards to coolant, some of the cheaper green coolants eat away on the alloys that toyota use for some parts. My thermostat cover lost the whole front end as it was consumed by this cheap antifreeze. Use the Red stuff from toyota!

blikoor · Post by **blikoor** » Sat Mar 08, 2008 9:49 pm

SuidWes wrote:Why the red one :?

The original Toyota antifreeze (red) is best especially on the 2.7 and Kzte.
What is the purpose of antifreeze ?
Keep water from freezing. Neutralise chemicals in water. Prevent rust in the engine.
Prevent bubbles forming in the water. Raising the boiling point of water with a few degrees.
With non-genuine antifreeze the bubbles forming between the waterpump impeller and the casing eat small holes in to the aluminium casing which eventually leaks through to the sump.
Take some good advice from years in fleet maintenance and buy the red Toyota antifreeze.

Bullet · Post by **Bullet** » Sat Mar 08, 2008 10:05 pm

As far as I know the colour doesn't really make a difference,just check on the anti-freeze container when u buy it for a very high ethylene-glycol concentration,some of the cheapies don't even mention this concentration

GTO · Post by **GTO** » Thu Mar 27, 2008 5:02 pm

I flushed the cooling system the other day and fitted a new radiator cap.
I went away this easter weekend and came back with a load of fire wood,temperature gauge never moved from its normal position.So it looks like the problem is solved.
Although I spoke to a mechanic today,he said that the problem I had sounded more like a thermostat sticking.Also I said to him the radiator has lost some fins at the bottom, he said I should replace it as well.Also the other day when I flushed the system I misted the radiator with water when it was hot and some wet patches remained in one or two places.What do you guys think?

Post by **CasKru** » Thu Mar 27, 2008 5:06 pm

I personaly would never take any chances with a radiotor. I've I had any suspision that it might leak, I would take it to be tested, just to give me peace of mind! m2cw

GTO · Post by **GTO** » Wed Aug 25, 2010 3:04 pm

My problem is back after 2 years since I flushed the system and changed the thermostat! :x
I was driving back from Mossel Bay on Friday and noticed the temp gauge climbing again on hills, I managed to get back home by putting the heater on on hills.
But now I cannot get the temp gauge too move above its normal position while driving up steep hills around town, it is the same symptoms as before it only does it after driving for a few hours? :?

writerguy · Post by **writerguy** » Mon Aug 30, 2010 3:12 pm

I had this exact problem.

Replaced thermostat, radiator and coolant, using Toyota bits and fluids.

Problem solved, now the gauge goes to halfway and stays there, in time honoured toyota fashion.

My guess would be that your thermostat is working intermittently hence the intermittent problem.

N

Post by **JohanM** » Mon Aug 30, 2010 3:44 pm

Hi Neil,

Glad to hear your Hilux is sorted out!!! Now we can go to Namibia & Botswana, what do you say???

Hilux 4x4 Forum

Temperature rising on hills

Temperature rising on hills

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