Isuzu Trooper Owners Club UK™

:::Matski::: · Posted: Tue Jul 18, 2006 12:58 Post subject: Over heated mk1

On my way to scotch corner at the weekend towing the unit, the temp crept up, so I pulled over and it was just oozing out or the expansion tank.

So I ran it with no load an it went back to normal in 1/2 a minuet or so, and was thing for the rest of the journey (another 1 1/2 hours).

Whilst I don't blame it for getting hot as I was towing 2 ton up the A1 in the blistering heat and had been in forth to overtake a long line of slowing lorry's up a hill.

The water was very dirty (black) even though I have recently flushed the engine an rad with the hose, the expansion tank was full of sludge at the time so I cleaned that out.

I suppose the rad and engine is full of this stuff too.

Is there a way of removing these deposits at home with a special flushing solution?

Or is it better to get it done at a garage, where I assume they pressurise the whole system.

Matt.

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Philp · Posted: Tue Jul 18, 2006 16:06 Post subject:

You can buy rad flush from halfords etc, it's a mild acid that'll loosen the muck up. You usually whack it in, drive around for a bit and then flush it out. I'm assuming you have proper coolant at the right strength mixture in it, if it's just plain water it probably will overheat as it's not as good at getting rid of heat as the right stuff. I'd also think about changing the T-stat (a couple of quid so cheap at the price) as they do sometimes get weak. If this is a diesel they run pretty cold normally so something must be a little awry, even in this heat.
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Phil

96 or is it a 98 Isuzu Bighorn Lotus

:::Matski::: · Posted: Tue Jul 18, 2006 16:52 Post subject:

It does have the correct coolant in.

Also the fins on the rad are clean and free from mud.

Can you get a t-stat from halfords or is it a milner job?

I think the sensor is wrong as even when it was coming out of the expansion tank it read 1/2 on the gauge.

Philp · Posted: Tue Jul 18, 2006 18:22 Post subject:

I got mine from my local car spares place, was a couple of quid, I also changed the sensor to get mine to read. Make sure no one has used ptfe tape or sealant on the sensor thread as they don't make a good earth.

Also is the viscous coupling on the fan working correctly? Spotlights etc in front of the grille will restrict airflow also. I'd try some flush or you could take it to a radiator repair place and they'll clean it out properly with good strong trade only stuff and can also then fix any leaks that may appear!. When you flushed did you do it from both ends? I always do top rad hose into rad and then bottom rad hose, remove T-stat and flush engine from top down and via bottom hose up unrtil it runs clear all ways, also remember to keep the heater turned to hot so it flushes the heater matrix too.
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Phil

96 or is it a 98 Isuzu Bighorn Lotus

Philp · Posted: Tue Jul 18, 2006 18:24 Post subject:

I hope it's not a comon problem as I'm planning on dragging my little Ifor williams 1 ton trailer 900 miles down through France i August and overheating would be a big problem!
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Phil

96 or is it a 98 Isuzu Bighorn Lotus

:::Matski::: · Posted: Tue Jul 18, 2006 18:25 Post subject:

:::Matski::: · Posted: Mon Jul 24, 2006 12:03 Post subject:

Well that seems to have cured it!

Absolutely full of black sediment Rolling Eyes

Fitted a new T-stat, although the one I was given first was wrong, turned out to need one for a bedford midi Surprised

Only found the right one by comparing pics and temp values 82 degrees.

Witchdoctor · Newbie Joined: 05 Sep 2006 Posts: 4 Location: Australia

What type of rad cleaner did you use, having heating problems.

Dave

:::Matski::: · Posted: Fri Sep 08, 2006 11:14 Post subject:

It didn't work after all Crying or Very sad

It is still full of *beep*

The sediment is filling the pipes half full! and is black, not oily, and faintly metallic.

I am thinking rad weld???

Maybe an egg cup full of detergent will clear it???

Sodding thing is doing my swede in Mad

:::Matski::: · Posted: Fri Sep 08, 2006 11:36 Post subject:

I used halfords stuff the first time, then trade only stuff and left it in for three days driving.

:::Matski::: · Posted: Fri Sep 08, 2006 11:43 Post subject:

Didn't work though Mad

Philp · Posted: Fri Sep 08, 2006 12:38 Post subject:

Take the rad out, take it to a radiator specialist and get them to clean it out, its likely that your flushes have loosened the crud in the rad up so it keeps reappearing each time you refill it and will continue to do so until its all gone. A rad specialist will use acid to clean it out and get rid of it once and for all. A good flush of the engine before it goes back in and all should be well. It was probably overheating because the rad was half full of sludge.
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Phil

96 or is it a 98 Isuzu Bighorn Lotus

:::Matski::: · Posted: Fri Sep 08, 2006 18:56 Post subject:

Yeah, I think you are right but the engine is full also.

Philp · Posted: Sat Sep 09, 2006 8:32 Post subject:

A good long back flush of the engine should shift all thats loose. Just take the rad out, take the T-stat out, wedge the hosepipe in the top hose, make sure the heater is set to hot and leave it running until it comes out clear, then stick the hosepipe in the bottom hose and repeat, thats not much space for slusdge to hide in an engine really as the water passages ain't huge. I think the rad is your real problem and its pumping sludge back into the engine.
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Phil

96 or is it a 98 Isuzu Bighorn Lotus

:::Matski::: · Posted: Sat Sep 09, 2006 12:18 Post subject:

I will have a look for someone who can do it in the York area then.