poohbear Posted July 7, 2008 Share Posted July 7, 2008 Hi guys, noticed on the way into work this morning that the temp gauge was climbimg towards the H end of the gauge at an alarming rate of knots. It used to sit right in the middle whatever the ambient temp and driving conditions! having had a look under the bonnet the top radiator hose is really hot and the bottom one is a lot cooler - so it would appear that the thermostat is opening and that the fan is cooling the radiator effectively. before I get too carried away with stripping stuff down has anyone had a similar problem to this before? Any tips as to what the cause might be. Many thanks, Dave. Quote Link to comment Share on other sites More sharing options...
western Posted July 7, 2008 Share Posted July 7, 2008 check the lower 4 rows of cooling fins on the engine side of the rad, if these have disappeared to dust, you'll need to either buy a new rad or get the existing one recored. Quote Link to comment Share on other sites More sharing options...
V8 Freak Posted July 7, 2008 Share Posted July 7, 2008 Your summary of hot at top and cold at bottom could be a lack of water circulation, but I've not heard of a water pump stop working without giving obvious signs like screeching or generally leaking water..... Quote Link to comment Share on other sites More sharing options...
poohbear Posted July 7, 2008 Author Share Posted July 7, 2008 Checked Rad - everything seems intact, although quite a bit of the 'fins' between the radiator passages seem to have disintegrated. This hasn't happened in the last few days though so I can't see how it would cause the truck to suddenly start overheating. I'm going to change the thermostat as a matter of course - just not sure whether to go with th 74 or 82 degree unint, what do you guys recommend? Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted July 7, 2008 Share Posted July 7, 2008 Could be a stuck stat, it will trickle enough water through the bleed to get the top hose hot but not flow enough to cool the engine, so the bottom hose will be dead cold as it's only a trickle of hot water to cool down across the rad. Buy a genuine stat, ask me how I know. Quote Link to comment Share on other sites More sharing options...
western Posted July 7, 2008 Share Posted July 7, 2008 Checked Rad - everything seems intact, although quite a bit of the 'fins' between the radiator passages seem to have disintegrated. This hasn't happened in the last few days though so I can't see how it would cause the truck to suddenly start overheating.I'm going to change the thermostat as a matter of course - just not sure whether to go with th 74 or 82 degree unint, what do you guys recommend? probably hasn't but as more have disintegrated over the last week or so the rad looses it's cooling efficentcy so the system tells you it's far to hot. I'm certain a new rad will cure it, sure did on my 200Tdi a few years ago. Quote Link to comment Share on other sites More sharing options...
paintman Posted July 7, 2008 Share Posted July 7, 2008 Same thing on my RRC. New rad cured it. Quote Link to comment Share on other sites More sharing options...
poohbear Posted July 8, 2008 Author Share Posted July 8, 2008 Alternatively - topping the coolant up with about 1 3/4 Litres of fresh fluid seems to have done the trick I'm going to try and find a hole to crawl into now Quote Link to comment Share on other sites More sharing options...
western Posted July 8, 2008 Share Posted July 8, 2008 Alternatively - topping the coolant up with about 1 3/4 Litres of fresh fluid seems to have done the trick I'm going to try and find a hole to crawl into now write out 1,000 times 'must check fluid levels frequently' a cheap fix too Quote Link to comment Share on other sites More sharing options...
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