DAVES_GT3 0 Posted May 9, 2005 Report Share Posted May 9, 2005 hi another problem to add to my list if anyone has any idea, temperature guage is sometimes sitting just above 50 degrees. obviously too low. but the fans do cut in if i leave it running while it is on 50 degrees. engine temp seems fine. but then im no mechanic! i wouldnt think it could be thermostat because the fans a cutting in as i say. think it minght just be the guage playing silly buggers? it does act normal sometimes dave Quote Link to post Share on other sites
s4simon 153 Posted May 10, 2005 Report Share Posted May 10, 2005 Does sound like the gauge. Freescan would pick this up as it has a 'Coolant Temp' data column. Quote Simon (94 S4) My Esprit will be for sale in late 2017 Link to post Share on other sites
lrg_machine 6 Posted May 10, 2005 Report Share Posted May 10, 2005 I had this problem on my S4s and it turned out to be the temp sender unit screwed into the pipework near the thermostat. About Quote Jez Mean Green S4s I think therefore I am - Descartes I'm pink therefore I'm spam - Eric Idle Link to post Share on other sites
DAVES_GT3 0 Posted May 10, 2005 Author Report Share Posted May 10, 2005 hi jez just been looking at the service book. is it the engine collant temperature sensor figure:15, or the water temperature sensor figure 14? cheers dave Quote Link to post Share on other sites
lrg_machine 6 Posted May 10, 2005 Report Share Posted May 10, 2005 just been looking at the service book. <{POST_SNAPBACK}> Err ! Service book? Figure 14? Here it is though Temp Sensor circled it (?) in red, located near the thermostat. just above the water pump If your fans are cutting in and out Ok then this is likely to be the culprit, as the ECU isn't seeing a fault so no check engine light just a dodgy reading on the gauge. Quote Jez Mean Green S4s I think therefore I am - Descartes I'm pink therefore I'm spam - Eric Idle Link to post Share on other sites
MKE40 0 Posted May 10, 2005 Report Share Posted May 10, 2005 hi another problem to add to my list if anyone has any idea, temperature guage is sometimes sitting just above 50 degrees. obviously too low. but the fans do cut in if i leave it running while it is on 50 degrees. engine temp seems fine. but then im no mechanic! i wouldnt think it could be thermostat because the fans a cutting in as i say. think it minght just be the guage playing silly buggers? it does act normal sometimes dave <{POST_SNAPBACK}> Quote "Neglect not thy opportunities" Martock ,Somerset. 1661 Link to post Share on other sites
MKE40 0 Posted May 10, 2005 Report Share Posted May 10, 2005 hi another problem to add to my list if anyone has any idea, temperature guage is sometimes sitting just above 50 degrees. obviously too low. but the fans do cut in if i leave it running while it is on 50 degrees. engine temp seems fine. but then im no mechanic! <{POST_SNAPBACK}> What I meant to say is that I have the same probs. I guess its the sender Quote "Neglect not thy opportunities" Martock ,Somerset. 1661 Link to post Share on other sites
DAVES_GT3 0 Posted May 10, 2005 Author Report Share Posted May 10, 2005 where the bloody hell is the sender? lol is it this sensor jez is on about. cheers by the way jez. dave Quote Link to post Share on other sites
lrg_machine 6 Posted May 10, 2005 Report Share Posted May 10, 2005 where the bloody hell is the sender? lol is it this sensor jez is on about. cheers by the way jez. dave <{POST_SNAPBACK}> Sender / sensor same thing If you look at the bit of ali pipe that houses the thermostat you'll see a single wire going to a small threaded unit off to the side THAT'S IT That's what failed on mine and caused my gauge to never read more than 70 Quote Jez Mean Green S4s I think therefore I am - Descartes I'm pink therefore I'm spam - Eric Idle Link to post Share on other sites
DAVES_GT3 0 Posted May 10, 2005 Author Report Share Posted May 10, 2005 cheers jez. i got it exactly now. sorry to be a pain but im on a learnig curve with these at the moment. cheers dave Quote Link to post Share on other sites
DAVES_GT3 0 Posted May 10, 2005 Author Report Share Posted May 10, 2005 oh jez did u manage to replace it without draining the system? or will that need to be done? dave Quote Link to post Share on other sites
lrg_machine 6 Posted May 10, 2005 Report Share Posted May 10, 2005 oh jez did u manage to replace it without draining the system? or will that need to be done? dave <{POST_SNAPBACK}> No need to drain. You'll lose some water but nothing that can't be topped up afterwards. Quote Jez Mean Green S4s I think therefore I am - Descartes I'm pink therefore I'm spam - Eric Idle Link to post Share on other sites
DAVES_GT3 0 Posted May 10, 2005 Author Report Share Posted May 10, 2005 nice one speak soon dave Quote Link to post Share on other sites
lrg_machine 6 Posted May 10, 2005 Report Share Posted May 10, 2005 Forgot. Just be very careful taking it out, it's on a taper thread and (can) shear. also when you put the new one in make sure it's threaded in properly and not crossed at all, the thread is quite fine. Quote Jez Mean Green S4s I think therefore I am - Descartes I'm pink therefore I'm spam - Eric Idle Link to post Share on other sites
glynherron 9 Posted May 10, 2005 Report Share Posted May 10, 2005 Hi guys my s4s is doing exactly this as well (fans OK, gauge reading low). So off to change the sensor. But where is the sensor that the ECU senses the water temp from and controls the fans? Cheers Glyn Quote Link to post Share on other sites
lrg_machine 6 Posted May 11, 2005 Report Share Posted May 11, 2005 my s4s is doing exactly this as well (fans OK, gauge reading low). So off to change the sensor. <{POST_SNAPBACK}> Hi Glyn This does seem to be a common problem, don't know if it's the sensors fault of just the average age of our cars, who knows??? But where is the sensor that the ECU senses the water temp from and controls the fans? <{POST_SNAPBACK}> the coolant temp sensor fr the ECU is located (according to the manual)on the intake chamber between tracts 3 & 4 BTW Glyn hows the car going? got it all finished yet? have you sold the black beauty? Jez Quote Jez Mean Green S4s I think therefore I am - Descartes I'm pink therefore I'm spam - Eric Idle Link to post Share on other sites
glynherron 9 Posted May 12, 2005 Report Share Posted May 12, 2005 Hi Jez and hpe you and the lrg beast are well. a bit of a hectic time for me at the mo, (year 11's leaving in 2 weeks, exams just after). There is a chap who seems very keen om black beauty, who has done his homework well, and is looking at a few that are supposed to be nice examples. So far he has been disappointed at what else he has seen, so its looking promising. He is seeing another this weekend and hopefully will be making a decision one way or the other soon after. Just about to do the C service on it and ordered a new exhaust downpipe. The s4s is running again!, but feels down on power (not getting full boost), and will be looking at it at half term. More problems with the normal cars - cam belt snapped on laguna (oh dear I said!!), and a cracked gearbox casing on the vectra. oh well, no use complaining just get on with it. See you at the next meet Glyn B) Quote Link to post Share on other sites
rocket63 137 Posted May 14, 2005 Report Share Posted May 14, 2005 Hi Glyn This does seem to be a common problem, don't know if it's the sensors fault of just the average age of our cars, who knows??? the coolant temp sensor fr the ECU is located (according to the manual)on the intake chamber between tracts 3 & 4 BTW Glyn hows the car going? got it all finished yet? have you sold the black beauty? Jez <{POST_SNAPBACK}> Have the same prob on my S4. Gauge reads no higher then 45c. And in the last day the Oil pressure gauge has gone bananas. Works, stops, works, stops etc etc Quote Caught between a rock and a hard place in a catch 22 situation, So its 6 of one and half a dozen of the other. Your damned if you do, but your damned if you don't so shut your cock!!!!!!!!!!! Lotus Espirt Turbo S3 Lotus Esprit S4 Lotus Elise S2 Sport 130 Link to post Share on other sites
keith h 0 Posted May 18, 2005 Report Share Posted May 18, 2005 Hi guys my s4s is doing exactly this as well (fans OK, gauge reading low). So off to change the sensor. But where is the sensor that the ECU senses the water temp from and controls the fans? Cheers Glyn <{POST_SNAPBACK}> Glyn, The TCS for the ECU is located behind the chargecooler pump. above the starter and screwed into the inlet manifold, just replaced mine due to going open circuit and overfuelling (loads of black smoke) and poor hot starting. One hell of a difference, think may have been reading incorrect for ages. Keith H Quote Link to post Share on other sites
LotusS4S 0 Posted May 24, 2005 Report Share Posted May 24, 2005 My S4S did the same. I replaced the Sender but the problem was the gauge. I've noticed that if you have a bad sensor and a good gauge, your temp usually does not read beyond a certain point, but if you have a bad gauge, and a good sender, the gauge will fluctuate a specific temp up&down depending on the actual temp. Mine read 10 degrees cooler at all times. This is not a proven science, but just a theory.... Quote Link to post Share on other sites
glynherron 9 Posted May 24, 2005 Report Share Posted May 24, 2005 If the sender unit outputs a voltage to the temp gauge, has anyone with a good gauge reading ever taken any voltage treadings for cold and normal operating temp? We might have a better idea from reading that we can take of ours Anyone?? Cheers, Glyn Quote Link to post Share on other sites
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