Over heating problems

Engines and Engine Systems
DanieG
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Re: Over heating problems

Post by DanieG » 11 Jan 2018 08:11

Hi Josh
Mine did not overheat either, I had to fix a pipe and refill (partially). Do you run the engine while bleeding or how do you go about it?
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Re: Over heating problems

Post by JoshJ » 11 Jan 2018 08:15

Yes, get the car up to normal temps. Put heater on full warm. The while idling you remove the cap. You will see the bubbles and a poor stream of water come out. Continue until you see a solid strong stream of water comming out. Put the cap back. Wait a bit and do it again until their is no more air comming out. Top up coolent in the plastic overflow bottle.
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Re: Over heating problems

Post by Clem » 11 Jan 2018 13:37

DanieG wrote:
10 Jan 2018 11:20
Louis Nel wrote:
02 Jan 2018 15:11
DanieG wrote:
07 Oct 2017 13:01
I have a strange problem, the metal pipe to the front of the starter motor leading to the heater (I presume), picked up a small crack on the way to the Namib, which they welded in Keetmanshoop. (Fortunately I picked it up before the car lost too much coolant and the engine temperature never climbed above normal.) They had to partially drain the coolant and I am not sure if the system was properly bled. The car runs at a very stable temperature, a little below normal and the coolant stays full. However, when towing or driving a long distance, I hear a boiling sound for a short while after stopping and swiching off, while the guage remains at normal. There is also no sign of water leaking or boiling. When I start again, it feels as if the heater comes on for a while. We, unfortunately, do not have any Patrol specialists nearby so I hope one of the specialists on the Forum has advice.
Normally if the cooling system makes a boiling sound but your Temp Gauge is normal, then its a coolant flow problem.
I had It on a Golf 1. I took the small pipe that's on the top of the Rad that leads to the bottle off, and it was blocked.
The min I cleared it out then the trouble was over. So that Patrols cooling system sounds as if the flow is a bit restricted and because of that its not cooling down fast enough.
The heater comes on and off at random while travelling, which is highly annoying. I read on an Aussie website recently of a 4.8 having exactly the same problem after flushing the cooling system. Apparantly the system has to be bled at a screw in front of the cylinder head to release all air. Does anybody have more info on that, I do not want to start unscrewing the wrong bolts.
See here: http://patrol4x4.co.za/viewtopic.php?f=44&t=4587

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Re: Over heating problems

Post by Jules » 14 Jan 2018 07:52

More, wil graag sekerheid kry moet my lorrie se neus afwaarts wys of moet hy opwaarts wys wanneer mens hierdie borrel gorrel oefening doen

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Re: Over heating problems

Post by ricster » 14 Jan 2018 09:32

Nose up, in my opinion Jules. The motor already sits at a slight angle ( front up ). This way air will move towards the thermostat housing, and can be bled off from there. Alternatively the air bubble will move into the radiator, and then one can either top it up or let the radiator cap do its thing as long as the motor gets up to temp and pushes the air bubble out to the water reservoir tank, and then when it cools it will suck the the coolant back into the radiator.
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Re: Over heating problems

Post by mvcoller » 14 Jan 2018 12:14

When you bleed any cooling system, you must always open the highest point of the system as the air needs to go to the highest point to escape. Therefore, as as Cedric says, park the vehicle nose up, so that the radiator cap is the highest point in the system

For that same reason, that "cap" in the 4.8 engine bay that JoshJ mentions, is obviously the highest point in the system. In this case successful bleeding is achieved even when the vehicle is parked to stand level.

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Re: Over heating problems

Post by Jules » 14 Jan 2018 13:19

ek het 2 radiator caps , 1.1b op radiator en 0.9b op overflow radiator cap , moes n modification doen toe overflow se pyp connection op oorspronklike radiator afgebreek het , die overflow is op hoogste punt

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Re: Over heating problems

Post by Jules » 14 Jan 2018 18:44

my return watertank do not send any water back into the system?? I had to pour some back into system to get the level to max again . did the heater on and stopped on incline and let it run topped up until no borrels

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Re: Over heating problems

Post by Peter Connan » 15 Jan 2018 05:15

It must be able to draw water from the overflow tank, but this will only happen once the car has cooled right down.

Jules, if this is not happening, there may be an issue with your modification.
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Re: Over heating problems

Post by jan.dup » 02 Feb 2018 15:03

I just returned from Kgalagadi/Namibia trip. Max temperatures ranged between 36 to 42 degrees C, it was really nice and hot :redface:
Corrugation is the nemesis of many a thing and the Kgalagadi has a good measure of that :biggrin: On the latter part of the trip in the dunes towards Gharagab (road the same type of condition as to Mabua or Kaa) the aircon did not cool although it worked - if that makes sense - as if there was no gas in. The next morning was a bit cooler and I only switched the aircon on at about 9 am to find it working perfectly again for the rest of the trip.
On my last day in the Kgalagadi on the dune road leading from Dikbaardskolk to Kamqua I noticed the temperature gauge moving up to above the halfway mark. I immediately switched the aircon off and it returned to the normal position (just below the halfway mark). It was at that stage about 38 degrees. As soon as I switched the aircon on the temp gauge again started to move up - needless to say I then switched the aircon off.
Later in the afternoon there was a quick shower of rain and it cooled off to about 30 degrees. When I tried to use the aircon on a lower setting it was fine and without any influance on the temp. The next morning I left the park through Mata Mata and took the D616 tweespoor dune road leading south and again saw the temp gauge going up when the aircon was switched on even at the lowest setting. As soon as I turned it off the temp was as usual. Temp during the day ranged between 38 and 40 degrees - my wife really did not enjoy that too much :biggrin: as we could not use the aircon for the day's drive. Next morning we headed home from Springbok and max temp was about 28 degrees. With aircon on no problems - temp normal.
Any ideas ?

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