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Think I may have sussed it! I had a faff about today & then thought about it. The thermostat wasn't opening under ordinary driving conditions, so I physically stopped the fan from spinning and lo & behold the bottom hose got hot! :clap So, I can safely say there are no blockages. Moving on, I...

I'd keep it bloody quiet until you'd bought up all you can? Then announce how good they are and flog 'em here for a tenner apiece :D:lol:lol:lol

I think it's a great idea. I currently have £3459.65 in assets in the cupboard underneath my kitchen sink :D

No, something odd's going on mate. I've had the dash out to check all the heater flaps, cables, etc. I've checked the coolant flow through the block, matrix and rad. I've changed the thermostat (and checked the old one for correct operation before replacing it), and I've run the car on the road...

That's exactly what I've been checking for mate :thumb2 Even after a good run the bottom pipe is cold to the touch. There's some convected heat on the 'stat housing, but but not a thing a couple of inches down the hose. And the rad's not seeing any pressure. This is what's leading me to now...

So that leaves us with the question of why is a tested 'stat not opening at the specified temperature? And why the truck's not overheating? :nenau The truck gets to temperature as it always has, and stays stable (even when towing a horsebox with a couple of horses in it as I did last week...

I took the stat out as a check, Rick. I'm convinced I' on the money with the viscous fan coupling failing engaged. Nothing else it can possibly be now, and the symptoms fit perfectly. I'll disengage the fan (not sure how yet) and check my diagnosis over the weekend. If I'm right, the 'stat will...

Been having a think, and I reckon I'm onto something. Coinciding with the heater losing efficiency, I also lost a couple of mpg. I put it down to the truck needing a service, and/or me being a bit heavy with the old right foot :o Thinking harder, I've also lost a wee bit of power too. She's lust...

Nowt wrong with the old thermostat after testing again. It opens just fine at 82C. Looks as though the coolant's just not getting to 82C??? Maybe I should put a cooler thermostat in? :nenau Anyone ever come across this before?

I just happened across it while I was trying to figure out what's happening with my cooling system. Just hope it's of some use to someone :thumbs

Right. I'm back to being completely baffled! Swapped out the thermostat for new (82C) and still getting no coolant through to the bottom of the rad. Matrix pipes are heating up and reaching the thermostat (even took off the alternator to check the flexi at the bottom of the steel matrix output...

Turns out I have a more 'interesting' issue . . . . . Seems as though the thermostat has failed closed. Now, I know this should lead to overheating but it isn't. God knows how :nenau The top radiator hose is hot, hot, hot. The lower one, including the thermostat housing is barely tepid to the...

Handy Nissan training material on the ZD30 engines http://www.nissanpatrol.com.au/ZD30-CRD-2008-2.pdf Might be of some use :thumb2

Air-locked again following my heater 'fix' last week. Ran great for a week after refilling with new coolant (turns out I misjudged how much it needed, so I've just been topping it up as needed) looks as though it's got a bit of an airlock again though as the heater's stopped blowing hot again...

You have a better memory than me, BB :o:lol :thumb2

I think JT means that he'd rather he'd replaced the existing damper pipe with a new flexi, rather than a like-for-like replacement? All I did with mine was cut the steel damper pipe, flatten it between two hammers, then bend it over a couple more times and hammer it flat :thumb2

Guess I should really fit the replacement I bought a while back as she's beginning to squeal after going through deep puddles . . . . . Anything I need to watch for? Is it a pig of a hob? Easy enough? :nenau As usual, any advice welcome :):thumb2

Great stuff! :thumb2

Try a wee bit of heat on the gearbox casting. Just play the flame around the perimeter of the plug, but don't let it get anywhere near red. And perversely, try tightening it a tiny bit first . . . .should help break the thread free :thumb2

Remember to check that the live terminal will be on the RHS of the vehicle? I bought a battery listed as a 'direct replacement' and the terminals were the opposite way round when I went to fit it. . . . . the battery itself fitted just fine, but it was a PITA re-routing the cables as there's so...