Julian H Posted February 28, 2016 Share Posted February 28, 2016 Post Jenvey install, yesterday did 85miles without issue, today, 7 miles from home temp rose to 100 so i stopped in a layby and switched off and the temperature kept going into the red 120+. It still reads that after nearly an hour. How long will i have to wait until it cools down? Coolant in the expansion tank is not even hot, nor was it! All i want to do is get her home, 7 miles but don't want to risk any damage obviously! Link to comment Share on other sites More sharing options...
revilla Posted February 28, 2016 Share Posted February 28, 2016 Does the engine (e.g. water rail water the temperature senders are) actually feel as hot as the gauge reads? At 120°C a droplet of water dripped onto the rail would sizzle and boil off rapidly. If it isn't apparently cooling down, just wondering if it could be a sender fault? Link to comment Share on other sites More sharing options...
Julian H Posted February 28, 2016 Author Share Posted February 28, 2016 the engine must now be stone cold but the sender is still reading 120+ after 1.5hrs i wonder if there is an airlock at the sender but it still cant be hot in there? Engine is cold all over to touch! Link to comment Share on other sites More sharing options...
revilla Posted February 28, 2016 Share Posted February 28, 2016 In this weather it will cool fairly quickly. If it's cold to the touch I think you can be fairly sure that the sender isn't at 120°C+. What does the gauge read if you unplug the sender (it's the one with only one single spade connector)? It should go to zero. If not there's a short to earth in the wiring. Link to comment Share on other sites More sharing options...
revilla Posted February 28, 2016 Share Posted February 28, 2016 And don't read too much into the expansion bottle not being hot. In the standard cooling circuit water doesn't actually circulate through it. I suspect your engine is all fine and the gauge is reading silly. Link to comment Share on other sites More sharing options...
Julian H Posted February 28, 2016 Author Share Posted February 28, 2016 HiIt must be the sender! What a coincidence, it had to happen at the same time as my upgrade. Do you know if its a standard Rover part and if its easy to get? I need to get one fitted pronto since I have a flat floor session at PGM next weekend! Link to comment Share on other sites More sharing options...
revilla Posted February 28, 2016 Share Posted February 28, 2016 The gauge sender isn't Rover ... Caterham or Redline. Are you safely back home now? Did you try unplugging the spade connector from the sender? If the gauge goes back down to cold when you do then it will be the sender. If it stays high, but still goes down when you switch the ignition off then you have a short circuit between the sender wiring and earth somewhere. If it still stays high when you switch the ignition off, the gauge must be stuck. Link to comment Share on other sites More sharing options...
revilla Posted February 28, 2016 Share Posted February 28, 2016 The gauge sender isn't Rover ... Caterham or Redline. Are you safely back home now? Did you try unplugging the spade connector from the sender? If the gauge goes back down to cold when you do then it will be the sender. If it stays high, but still goes down when you switch the ignition off then you have a short circuit between the sender wiring and earth somewhere. If it still stays high when you switch the ignition off, the gauge must be stuck. Link to comment Share on other sites More sharing options...
Julian H Posted February 28, 2016 Author Share Posted February 28, 2016 It must be the sender. With ignition switched on it falls back to zero when unplugged. It was strange the way it failed, gradually reading hotter and hotter until I got to a point where I could not believe it anymore. Home now thanks, stirling support from Bob, shelleyb helping me out in my moment of insecurity! Looks like Ill be onto Redline again in the morning. Link to comment Share on other sites More sharing options...
revilla Posted February 28, 2016 Share Posted February 28, 2016 Yes it's an unusual way for them to fail, they usually develop a poor connection internally which leads to an intermittent or low reading. Not seen one fail to low resistance and high reading before, but must be the sender. Link to comment Share on other sites More sharing options...
Roadsport06 Posted February 28, 2016 Share Posted February 28, 2016 Mine happened after a coolant change, temperature reading just got higher and higher. New sender and all good. I think a Bluetooth obd reader is worth having. My ELM327 was about £5 from ebay and has already paid for itself. You can then compare the reading to the ECU to the dial. It confirmed that the sender was the issue. Link to comment Share on other sites More sharing options...
SM25T Posted February 28, 2016 Share Posted February 28, 2016 Mine climbed to 120C on the way across Germany last Autumn. All hoses felt normal so I knew it was the sender. Replaced on hotel car park and all returned to normal. I seal around the end cap of the sender with araldite to help stop water ingress and the electrical terminal from rotating. Link to comment Share on other sites More sharing options...
Julian H Posted February 28, 2016 Author Share Posted February 28, 2016 Thankyou for the reassurance guys. I guess the coincidence with my TB installation drove my insecurity about an airlock! Redline in the morning! Link to comment Share on other sites More sharing options...
DJ. Posted February 28, 2016 Share Posted February 28, 2016 Glad to hear it sounds like a sender problem, but better safe than sorry. It was a cold day to be sitting around so long. Duncan Link to comment Share on other sites More sharing options...
Julian H Posted February 29, 2016 Author Share Posted February 29, 2016 You know me Deej, suffering for my Seven! I was freezing. Link to comment Share on other sites More sharing options...
Ian B Posted February 29, 2016 Share Posted February 29, 2016 You need to put some weight on Julian; give you a bit more insulation Link to comment Share on other sites More sharing options...
oilyhands Posted March 1, 2016 Share Posted March 1, 2016 Bluetooth OBD might not be a big help as the OP has an Emerald, the Emerald software can be used for the temp reading though.Oily Link to comment Share on other sites More sharing options...
Julian H Posted March 2, 2016 Author Share Posted March 2, 2016 HiMy sender arrived yesterday thx to Redline. Do I use anything on the thread to seal it? PTFE tape? Link to comment Share on other sites More sharing options...
revilla Posted March 2, 2016 Share Posted March 2, 2016 Different people tend to use different things, but PTFE tape should be fine. Link to comment Share on other sites More sharing options...
SM25T Posted March 2, 2016 Share Posted March 2, 2016 Not too much as you need an earth contact. I use a smear of Hylomar blue on the thread Link to comment Share on other sites More sharing options...
Julian H Posted March 2, 2016 Author Share Posted March 2, 2016 Excellent thanks. I have both, good call on the earth contact Ian! Link to comment Share on other sites More sharing options...
Julian H Posted March 2, 2016 Author Share Posted March 2, 2016 Sensor fitting done. Coolant topped up, garage looked like a scene from Casualty with hose and funnel being suspended from the roof whilst I massaged my hoses Link to comment Share on other sites More sharing options...
JNC Posted March 2, 2016 Share Posted March 2, 2016 Never mind massaging your hose in the garage !! I know we all hare a special relationship with our cars ! But you might be getting a little to excited Julian . Lol , Does it work now ? Link to comment Share on other sites More sharing options...
Julian H Posted March 3, 2016 Author Share Posted March 3, 2016 Look mate, what I do in my garage is MY business Link to comment Share on other sites More sharing options...
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