blythmrk Posted February 14, 2017 Share Posted February 14, 2017 As per subject is the diff cooler oil on UK cars pumped electronically or mechanically around the cooler? My mechanic says its electric and has some type of motion sensor too? If so it only pumps when the car is in motion? Is there anyway of checking the operation and suppose if it's defective the only loss is to cooling which is not required anyway! My cars diff is whining (see wanted post) and it's had a new diff cooler recently but presume this was damaged to to the old one leaking. Thanks Quote Link to comment Share on other sites More sharing options...
Lee P Posted February 14, 2017 Share Posted February 14, 2017 It has an electric pump on the top of the diff and a temp sensor to trigger it Quote Link to comment Share on other sites More sharing options...
blythmrk Posted February 14, 2017 Author Share Posted February 14, 2017 It has an electric pump on the top of the diff and a temp sensor to trigger it Thanks Lee so my mechanic mate is right! Is there a way of checking if its operating correctly? As I said if it is in operational this is no detriment as the cooler is not needed am I correct? Thanks Mark Quote Link to comment Share on other sites More sharing options...
Tyson Posted February 14, 2017 Share Posted February 14, 2017 Thanks Lee so my mechanic mate is right! Is there a way of checking if its operating correctly? As I said if it is in operational this is no detriment as the cooler is not needed am I correct? Thanks Mark Go for an extended drive down the motorway at cruising speed then pull off at a services and feel the cooler, if it's hot then it's working. If it's cold then something is broke as Lee said it only activates once the diff reaches the temperature trigger otherwise no oil is being passed through it. Quote Link to comment Share on other sites More sharing options...
blythmrk Posted February 14, 2017 Author Share Posted February 14, 2017 Thanks for that I didn't think they would get that warm! All I need is a crown wheel and pinion for my diff then I can test the cooler! Quote Link to comment Share on other sites More sharing options...
Tyson Posted February 14, 2017 Share Posted February 14, 2017 Thanks for that I didn't think they would get that warm! All I need is a crown wheel and pinion for my diff then I can test the cooler! It'll get warm enough for you to know if it's working, the whole purpose of the cooler is to disperse heat, so if you can feel the heat radiating from it it is doing its job. Quote Link to comment Share on other sites More sharing options...
blythmrk Posted February 14, 2017 Author Share Posted February 14, 2017 In 15 years I have never noticed either of my cars with a warm diff cooler but thinking about it now I have noticed it dries off when it was raining after stopping! Thanks again. Quote Link to comment Share on other sites More sharing options...
Tyson Posted February 14, 2017 Share Posted February 14, 2017 In 15 years I have never noticed either of my cars with a warm diff cooler but thinking about it now I have noticed it dries off when it was raining after stopping! Thanks again. It was designed for high speed cruising on the German autobahns so it probably doesn't really have much use over here unless you are doing track days or long distance motorway cruising. Quote Link to comment Share on other sites More sharing options...
blythmrk Posted February 14, 2017 Author Share Posted February 14, 2017 It was designed for high speed cruising on the German autobahns so it probably doesn't really have much use over here unless you are doing track days or long distance motorway cruising. Ok makes sense so all EU spec supras have the diff cooler? Quote Link to comment Share on other sites More sharing options...
Tyson Posted February 14, 2017 Share Posted February 14, 2017 Ok makes sense so all EU spec supras have the diff cooler? Yes to the best of my knowledge. Quote Link to comment Share on other sites More sharing options...
Mika Posted February 15, 2017 Share Posted February 15, 2017 Ok makes sense so all EU spec supras have the diff cooler? Yes, all Euro Spec Supras do have the diff cooler. Quote Link to comment Share on other sites More sharing options...
Sheefa Posted February 15, 2017 Share Posted February 15, 2017 In 15 years I have never noticed either of my cars with a warm diff cooler but thinking about it now I have noticed it dries off when it was raining after stopping! Thanks again. It's also hidden behind the plastic guard Mark so wouldn't necessarily be easy to notice the heat radiating from it. Quote Link to comment Share on other sites More sharing options...
blythmrk Posted February 15, 2017 Author Share Posted February 15, 2017 It's also hidden behind the plastic guard Mark so wouldn't necessarily be easy to notice the heat radiating from it. True I do seem to remember my red Mkiv being warm some times. Quote Link to comment Share on other sites More sharing options...
SteveC Posted February 16, 2017 Share Posted February 16, 2017 There are two contacts that you can short out to test the diff pump. I tested mine a few years ago. Not sure where that info is now as I've moved home since then, but if I manage to find it, I post it here. Quote Link to comment Share on other sites More sharing options...
Guest Marek300zx Posted February 18, 2017 Share Posted February 18, 2017 Does anyone have wiring diagram for diff cooler? Quote Link to comment Share on other sites More sharing options...
SteveC Posted February 19, 2017 Share Posted February 19, 2017 Found the info I was referring to above: It just so happens that I was reading about the diff cooler system today! Manual says to connect terminals OP2 and E1 in the engine bay diagnostic connector, then check that there is pressure in the diff oil inlet hose from the pump. You should get the 'diff oil' warning lamp flash on your dash too. Hope that helps! Quote Link to comment Share on other sites More sharing options...
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