Leadership Team SLR No.77 Posted August 9, 2017 Leadership Team Share Posted August 9, 2017 Blatchat is really missing the old members who had experience of these issues.Gavin, unless it's been modified the sender for the coolant temperature gauge is in the rear of the water rail directly above exhaust primary number 4, if you're sat in stationary traffic the heat from the primaries causes the water rail to heat up substantially and this will show on the gauge. As soon as you pick up any speed it will cool back down quite rapidly to normal temperature.Unless it's been modified the thermostatic switch for the fan is on the top of the radiator and will activate based upon radiator temperature not engine temperature - obviously the two will be somewhat linked but when you're sat in traffic they will behave differently, therefore what you see on the temperature gauge will not be directly indicative of what's going on with the fan.If these two cases are both correct, you have nothing to worry about and your engine is fine.Stu. Link to comment Share on other sites More sharing options...
gavingraysonr300 Posted August 9, 2017 Author Share Posted August 9, 2017 Spot on Stu the car was in for tracking being checked after i changed the track rods so asked him if he would have a look at what was going on with his heat gun. After 2 hours of checking temps he said the penny finally dropped temp at sensor 120deg temp at pipe coming into rail 57deg so he fitted a heat deflector and sure enough temp at sensor 73deg. never done this before but i had a decat pipe put on when it was refurbished and the problem has been since then it did have air locks but sorted them after they had refilled it. i can only think that the new primaries are a bit closer to the sensor or my mechanic said my old primaries could of been coated think he said ceramic coated internally. do you think it might be an idea to get them heat wrapped. seams to be behaving at the moment but will see how it goes. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted August 9, 2017 Leadership Team Share Posted August 9, 2017 Get one of these from Caterham: https://caterhamparts.co.uk/other/2148-cooling-submarine-rover-2-outlet.html, you'll need the "blanks" to fit in each take-off outlet as well plus a couple of hose clips. It's fitted into the coolant bypass hose that runs round the rear of the engine, or in the hose from the coolant rail to the heater if you have a heater fitted. This enables the senders for the coolant gauge and the ecu to be relocated away from the coolant rail / exhaust primaries to give more stable readings. The ecu will have had false temperature readings as well as the gauge potentially upsetting the running but you're not likely to have noticed.Stu. Link to comment Share on other sites More sharing options...
gavingraysonr300 Posted August 10, 2017 Author Share Posted August 10, 2017 Thanks Stu what's the threaded rod on the top of it for can you bolt it to something or make a bracket ? Why do you think it didn't do it before I had my exhaust changed ? Link to comment Share on other sites More sharing options...
SM25T Posted August 10, 2017 Share Posted August 10, 2017 It's for an earth connection as it is mounted in a rubber hose both ends. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted August 10, 2017 Leadership Team Share Posted August 10, 2017 I can't answer regarding the exhaust, however the problem tends to only occur in particularly warm weather, the exhaust may just be coincidental.You may or may not need to earth via the threaded rod depending upon the age of the car - if the senders that you relocate have two wires to each they're already earthed, if the gauge sender has one wire it will have been earthed through the coolant rail, in this case you'd need to earth the new pipe to enable the sender to work. I think your car will not need an extra earth, I'm sure the change happened around 1996 with the change from VDO to Caerbont gauges. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted August 10, 2017 Leadership Team Share Posted August 10, 2017 Gavin, isn't your car around 2003? Link to comment Share on other sites More sharing options...
SM25T Posted August 10, 2017 Share Posted August 10, 2017 My 2002 car has a one wire sender. Link to comment Share on other sites More sharing options...
revilla Posted August 10, 2017 Share Posted August 10, 2017 As does my 2003 car. Link to comment Share on other sites More sharing options...
gavingraysonr300 Posted August 10, 2017 Author Share Posted August 10, 2017 Yes 2003 Stuart thanks for the help you still thinking about selling those wheels hint hint Link to comment Share on other sites More sharing options...
gavingraysonr300 Posted August 10, 2017 Author Share Posted August 10, 2017 Also if i made a bracket to hold the new mini rail attached to the threaded bar and fastened it to the body work would that not act as a earth ? im sure the wire to the gauge is a single one but not sure will have to check. Link to comment Share on other sites More sharing options...
SM25T Posted August 10, 2017 Share Posted August 10, 2017 It would. Link to comment Share on other sites More sharing options...
revilla Posted August 10, 2017 Share Posted August 10, 2017 ... provided that the bracket was metal and bolted to a clean/unpainted bit of chassis making a good contact. I'm not being silly, there was a recent case of a car with starting issues which turned out to he caused by the main ECU earth being bolted down to the plastic heater! Link to comment Share on other sites More sharing options...
SM25T Posted August 11, 2017 Share Posted August 11, 2017 Probably attached to the engine rather than the body ? Link to comment Share on other sites More sharing options...
revilla Posted August 11, 2017 Share Posted August 11, 2017 Probably would be better yes. Link to comment Share on other sites More sharing options...
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