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Old 6th December 2004, 08:55   #1
jever98
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Default Remove Thermostat for Africa?

Hi there,

another noobie in the forum. Thanks a lot first for all the great advice. I moved to Rwanda in October and was looking for a good 4x4 to use here in Africa. My research was greatly helped by your site, leading me to order a 1994 SSR-X 3.0D from Japan. It is currently on the ship to Mombasa, where someone will pick it up for me.

Lots of people I talked to here said that the first thing that should be done when the car arrives is to remove the thermostat to reduce the risk of overheating. However, I wasn't quite clear on what the thermostat actually does and why the removal would help to avoid overheating.

As far as I understand, the thermostat regulates the use of the radiator? Is it true that when the car is cold, the thermostat allows the radiator to be excluded from the cooling cycle and then gradually includes it as the engine gets warmer? If this would be the case, I could understand why people would remove it - it never really gets cold around here .

Lastly, I was thinking of buying a few spot lights to put them on the small bullbar the car comes with to amplify the high beam when driving on bad roads at night. Do you think this would hamper cooling in any serious waya? And would it be easy to connect these lamps such that they turn on when on high beam?

Thanks in advance for your help,

Nick
Rwanda

Last edited by jever98; 6th December 2004 at 08:57.
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Old 6th December 2004, 09:22   #2
slim
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Quote:
Originally Posted by jever98
Hi there,

another noobie in the forum. Thanks a lot first for all the great advice. I moved to Rwanda in October and was looking for a good 4x4 to use here in Africa. My research was greatly helped by your site, leading me to order a 1994 SSR-X 3.0D from Japan. It is currently on the ship to Mombasa, where someone will pick it up for me.

Lots of people I talked to here said that the first thing that should be done when the car arrives is to remove the thermostat to reduce the risk of overheating. However, I wasn't quite clear on what the thermostat actually does and why the removal would help to avoid overheating.

As far as I understand, the thermostat regulates the use of the radiator? Is it true that when the car is cold, the thermostat allows the radiator to be excluded from the cooling cycle and then gradually includes it as the engine gets warmer? If this would be the case, I could understand why people would remove it - it never really gets cold around here .

Lastly, I was thinking of buying a few spot lights to put them on the small bullbar the car comes with to amplify the high beam when driving on bad roads at night. Do you think this would hamper cooling in any serious waya? And would it be easy to connect these lamps such that they turn on when on high beam?

Thanks in advance for your help,

Nick
Rwanda
hi mate.
i think that ive seen this question covered before on this site( removing thermostat ) i would try a search on that word see what you come up with. but i seem to remember that taking the thermostat out will not make it any better for hot country,s but poss worse. think what some 1 did is to replace the rad with a 4 core instead of 2. as for the spots i have also seen this posted on this site!!!, think the aussie guy,s will be able to help on that 1 . having said that there will be some 1 along soon with greater knowledge than i have cheers mate good luck.............
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Old 7th December 2004, 07:35   #3
jever98
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Thanks for the reply.

I searched the forum beforehand, but couldn't find any definitive answer.

Looking at the Australian site, it seems that only auto gearbox 3.0D have the overheating problem (mine's a manual). Also, someone from Uganda advises against removing the thermostat, since, he argues, it means that the engine temperature will fluctuate unnecessarily. Here's the link: OnCourse 4WD Cheers
Nick
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Old 7th December 2004, 10:10   #4
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One of the functions of the thermostat is as a restrictor to slow the flow of coolant down around the engine. This is good for the engine in keeping it cool as it allows the water to absorb more of the heat.

If you remove the thermostat you may end up with an engine that actually runs hotter.

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Old 7th December 2004, 14:54   #5
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Nick of Rwanda!
Nick of Rwanda!
This is Enzo of Zimbabwe calling...

I shipped my 3.0 TD 4Runner (UK name for a Surf) out to Zim via SA. I had overheating probs in the UK and split my head so replaced that and the rad. Still had overheating probs so had the rad increased from 3 to 5 core. Had to loose the fan's viscous coupling (ie: hard wiring the fan to the engine) to get the new deeper rad in so now my fan runs all the time.

I have twin IPF 800 series spots (big rectangular !!!!!!!s) and I felt they blocked the airflow across my rad esp. when towing a caravan ,and going at slower speeds, so I removed them, but now that I've got the larger rad and constant fan I've re-fitted them. Everything seems OK so far but I've only made the 1000km run to Zimbabwe twice in this vehicle and the second time was at night (this is what spooked me to re-fit the IPFs - !!!!!! giraffe, warthogs, impala, goats, donkeys and cows wandering all over the road! That plus most Zim cars have NO !!!!ing rear ights!)

My IPFs also come on with the high beams but I had an auto electrician wire them for me - only problem is if one of your H4 blows, you loose all your lights, so try and make sure that the spots and your H4s can work independantly as well as together.

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Old 7th December 2004, 16:27   #6
jever98
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@Enzo: thanks for the advice. Is your 3.0 an automatic? Is there anything that determines why they overheat? I heard that only automatic transmissions overheat, but was wondering if that's true.
Also, what are H4s??

@Andy: Not sure that faster coolant cycling should make the car run hotter - After all, the higher the temp difference between the water in the cooler and the air surrounding it, the more effective the cooling. so if the coolant stays in the radiator for longer, it should cool less effectively at some point? Unless I am getting something very wrong here.

Thanks again,
Nick
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Old 7th December 2004, 16:35   #7
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Quote:
Originally Posted by jever98
@Enzo: thanks for the advice. Is your 3.0 an automatic? Is there anything that determines why they overheat? I heard that only automatic transmissions overheat, but was wondering if that's true.
Also, what are H4s??

@Andy: Not sure that faster coolant cycling should make the car run hotter - After all, the higher the temp difference between the water in the cooler and the air surrounding it, the more effective the cooling. so if the coolant stays in the radiator for longer, it should cool less effectively at some point? Unless I am getting something very wrong here.

Thanks again,
Nick
If the water circulates faster it gets less chance to absorb the heat from the block, it will also have less chance to lose that heat in the radiator. Basically the water only transfers heat when it is in contact with the block or radiator. As far as I understand, the faster it is flowing, the less time it is in contact, therefore the less heat transfered. I may be totally wrong but that is how I understood it.

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Old 7th December 2004, 17:43   #8
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3.0 Manual. Personally I think it's all down to lazy design - they took a radiator & truck orig. designed for a 2.4 petrol engine and they did not modify it when they stuck in the 3L diesel.

Your standard main beam bulbs are H4's.
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Old 8th December 2004, 08:01   #9
jever98
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Thanks for the info folks.

I still don't understand why some 3.0s overheat and some don't. I won't be towing a trailer, but still don't want to take risks.

Two more things I wanted to check with the community:

1. When the car gets off the boat, the person who will pick it up for me will get it serviced. Here is what I thought he should do before driving the 1800km to Kigali:
- Change engine oil and filter
- Check transmission and diff oils
- Grease all the important points on transmission and bearings
- Drain cooling system, flush out gunk and replace coolant, checking that nothing leaks

2. I was thinking of buying a roof tent at some point, for safaris. Any advie, Enzo, what to go for? I hear Hannibal tents are great, but not sure what's best for value for money.

Cheers
Nick
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Old 8th December 2004, 11:02   #10
lucky
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Quote:
Originally Posted by jever98
Thanks for the info folks.

I still don't understand why some 3.0s overheat and some don't. I won't be towing a trailer, but still don't want to take risks.

Two more things I wanted to check with the community:

1. When the car gets off the boat, the person who will pick it up for me will get it serviced. Here is what I thought he should do before driving the 1800km to Kigali:
- Change engine oil and filter
- Check transmission and diff oils
- Grease all the important points on transmission and bearings
- Drain cooling system, flush out gunk and replace coolant, checking that nothing leaks

2. I was thinking of buying a roof tent at some point, for safaris. Any advie, Enzo, what to go for? I hear Hannibal tents are great, but not sure what's best for value for money.

Cheers
Nick
I would add to that.

1. change fuel and air filter.
2. Change all drive belts - Fan belt etc.

Cheers
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