Fortuner 3.0 D4D overheating

[KAPNEL1971]

Guys, please help. Don't know what to look for anymore. When I am pulling my caravan, on a steep up hill for example in Pretoria on the N1 from Atterbury to the top of the hill before as sending down to the R21 to Kempton Park, my Fortuner will heat up to 3/4 and sometimes higher on the temperature gauge. I have replaced the fan clutch as well as the thermostat hoping it will solve the issue, but it didn't. About 45 minutes into towing my van, my aircon will also stop working for a couple of minutes and start again. This is ongoing whilst on the highway. The aircon was flushed and gased again, no joy. Still doing it. Any ideas what to do next?

[Knuppel]

Regarding your aircon, when the engine temperature reaches a certain point it will cut the aircon in an attempt to cool the engine down automatically.

Do you have auto box or manual?
Do you have big spots on the front or any other aftermarket goodies that obstruct the air flow.

[Thabogrobler]

What mileage has the car done?

Radiator might be blocked, waterpump corroded, airflow blocked??

Is the car chipped? If so which chip?

[ChrisF]

After market bumper ?


As nice as these look, many of these DO block the airflow and cause heating ....

Fitted a known brand to a Prado, and suddenly it started heating up on hills. Had a good look at the "front profile", and it was clear how this nifty bumper reduced the air flow. Followed the lines of the bumper and drilled a number of 50mm holes. Heat back to normal.

spots would do this as well.



then something else to consider - have you done any driving in tall grass ????? The grass gets in between the aircon and radiator coils, effectively reducing the air flow ......



I see your signature says you are in the Cape - if you dont get it sorted, DO speak to Francois at 4xLux

[Mars]

Did the problem start suddenly or was it there all along? i.e. did you only start towing recently and now you have the heat problem? +1 for something obstructing the airflow.

[KAPNEL1971]

Regarding your aircon, when the engine temperature reaches a certain point it will cut the aircon in an attempt to cool the engine down automatically.

Do you have auto box or manual?
Do you have big spots on the front or any other aftermarket goodies that obstruct the air flow.

It is a manual and yes, I do have spots but the problem started a month before I added the spots and snorkel.

[KAPNEL1971]

What mileage has the car done?

Radiator might be blocked, waterpump corroded, airflow blocked??

Is the car chipped? If so which chip?

166000km. It has a unichip installed. Radiator seems to be clear.

[KAPNEL1971]

Did the problem start suddenly or was it there all along? i.e. did you only start towing recently and now you have the heat problem? +1 for something obstructing the airflow.

Hi Mars, no, I have been towing for a while. It only happened suddenly and now on every trip.

[Die$eL]

Are you using Toyota Long Life Coolant?
Maybe replace the radiator cap (with another genuine Toyo one)
If the intercooler clean? Hotter intake air would result in hotter engine. Any difference in power recently?

Please post the solution when you find it. A buddy has a stock Prado and its doing similar (not towing)
his is petrol though.

[Knuppel]

Have the Unichip checked out. Your engine may be overfueling and that chases the EGT leading to overheating.
If that is the case then you can damage injectors and pistons also.

[ChrisF]

UNICHIP ....


Havi ISAK at DYNOTECH check out the chip and programming .....


Chips add power by ADDING FUEL ... and increasing the engine temperature ....



For normal driving you are seldom on the power long enough to actually see the increase in temperature, but with towing you may well see it .....



Now to find a chip setting where you dont overfuel during normal towing .... IF this is the problem

[Dirka]

Aircon radiator freezing up maybe?
Blocks the airflow to main radiator until it unfreezes again.
Make sure aircon gas is ok.

[ChrisF]

Aircon radiator freezing up maybe?
Blocks the airflow to main radiator until it unfreezes again.
Make sure aircon gas is ok.

not possible on a car.

"heat pump" AC units at home or office can do this when in heating mode - the outside coil gets cold enough to freeze up.


But a car AC is cooling only, with the condensor coil being HOT.



HOWEVER, the evaporator coil inside the car CAN freeze up .... but this wont affect the engine temp.

[Knuppel]

Like I said before regarding the AC, the ECU monitors the engine temperature. As soon as this goes outside the set parameter it cuts the AC if it was on. This then removes the heat source in front of the radiator and removes a couple of kilowatt of strain from the engine.

[KAPNEL1971]

Like I said before regarding the AC, the ECU monitors the engine temperature. As soon as this goes outside the set parameter it cuts the AC if it was on. This then removes the heat source in front of the radiator and removes a couple of kilowatt of strain from the engine.

That makes perfect sense to me, now I just need to find the reason for the high temperature. I have ordered a new radio cap, that would mean then that I have chants he'd clutch fan, the thermostat and the radiator cap.

[ChrisF]

Marius do speak to Isak at Dynotech.

Pretty sure he will let you know what's what after a dyno run.

If you want to monitor it yourself - get an EGT gauge.

It even shows the minor rise in exhaust temperature when you get a head wind.


YES, first prize is to check the airflow into the engine bay, and do what is practical to increase it.

BUT, a "chip" is a new ball game .... these things LOVE to over fuel !!! and this HEAT .....

[KAPNEL1971]

Marius do speak to Isak at Dynotech.

Pretty sure he will let you know what's what after a dyno run.

If you want to monitor it yourself - get an EGT gauge.

It even shows the minor rise in exhaust temperature when you get a head wind.


YES, first prize is to check the airflow into the engine bay, and do what is practical to increase it.

BUT, a "chip" is a new ball game .... these things LOVE to over fuel !!! and this HEAT .....

The problem is that I no longer live in Cape Town, I am in Johannesburg now. Any idea who can check it for me here?

[ChrisF]

was wondering why you were talking of hills in Pretoria .....

Marius let's see if the Jo-burg manne can refer you to a good local shop

[Thabogrobler]

Dastek - they manufacture the Unichip afterall!

012 347 1747 if memory serves.

Does your car have an aftermarket bumper of spotlights on?

And these bonnet guards?

[KAPNEL1971]

Dastek - they manufacture the Unichip afterall!

012 347 1747 if memory serves.

Does your car have an aftermarket bumper of spotlights on?

And these bonnet guards?

None of the above except for spot lights, but it started doing it before I fitted the spotlights.

[Drifter X]

Are you losing coolant when the Fortuner overheats?

[KAPNEL1971]

Are you losing coolant when the Fortuner overheats?

Nope, all levels remains the same.

[Die$eL]

speaking of coolant, when last was it replaced?
It has a certain lifespan

[KAPNEL1971]

speaking of coolant, when last was it replaced?
It has a certain lifespan

I replaced the thermostat 1 week ago as well as the coolant, all original Toyota.

[Mars]

You have basically eliminated all the issues I would have looked at except for the mapping of the Unichip or possibly the water pump. Dastek in Pretoria are the guys to ask to assist with the chip. They make it after all.

It is possible that the water pump impeller is corroded away or somehow damaged limiting its efficiency but it is very unlikely if the Engine had anti-freeze in at the right concentration up to now.

[Die$eL]

I agree with Mars. Remove the chip and see if that makes a difference.

hopefully u have the plug n play one so its a 2 min job

[Johan Kriel]

What mileage has the car done?

Radiator might be blocked, waterpump corroded, airflow blocked??

Is the car chipped? If so which chip?

166000km. It has a unichip installed. Radiator seems to be clear.

Some times it looks clear but it is not.

[Knuppel]

Have you ever had the fan belt snap on you ?

[KAPNEL1971]

Have you ever had the fan belt snap on you ?

Not yet.

[Ranger]

Hallo Marius.
Jy kan vir Hennie Havenga skakel.
Sy werkswinkel is in Vereeniging.
Sy nr is 083 3030480.
Ek is seker hy sal jou kan help.
Groete

[longjefferson]

Please check if you are reaching the redline in engine temperature or is it just going up above average. In my experience people usually mistaken overheating to an engine just heating up normally. If the indicator is below the redline and above medium ( usual city driving) that is still okay.

Sent from my GT-N7000 using Tapatalk

[MCHILUX]

Probeer n nuwe radiator het so paar maande terug met n Hilux 1KD so gesukkel