Bluebear Posted May 20, 2013 Share Posted May 20, 2013 (edited) Hey all, for a while now I've had a problem where the needle for coolant temp in the standard cluster will dip from the normal level depending on if the engine is under load or if the car is going over bumps etc. The coolant level is pretty much full, and I've topped it up before now with no effect. When the car is stopped and there's no throttle what so ever, the needle always returns to the normal temperature position (just under half), so it can't be overheating. Range of movement can be from normal level all the way down to the bottom of the gauge. Never goes above.The waterpump is practically brand new, and the belt hasn't been slipping (no noise, alternator is fine etc), so what could it be? A bad earth or something that's loose (moving about with the car's movement), or a knackered temp sensor? Anyone had this before? Edited May 20, 2013 by Bluebear Quote Link to post Share on other sites
Amjad Posted May 20, 2013 Share Posted May 20, 2013 Thermostat? Quote Link to post Share on other sites
Jamie1st Posted May 20, 2013 Share Posted May 20, 2013 I had this, the wiring on jap cars goes brittle, check for a broken wire at the temp sensor, mine was only broke enough to loose contact when I was under boost, then return to normal when it made contact again. Quote Link to post Share on other sites
jtaylor1990 Posted May 20, 2013 Share Posted May 20, 2013 I have exactly this issue too. I think it may be thermostat as stated above. Im not sure but may be that the thermostat is stuck open so takes longer for the coolant to reach its optimum temp. I havnt got round to replacinf mine yet but id reccomend doing that first i think they are pretty straight forward to change looking at where they are located. If u do decide to go for it and change it, PM me and let me know if its made a difference. Quote Link to post Share on other sites
micky boy Posted May 20, 2013 Share Posted May 20, 2013 Thermostat I was haveing the same problem Quote Link to post Share on other sites
Bluebear Posted May 20, 2013 Author Share Posted May 20, 2013 (edited) Thermo has been changed already about 2 months ago, coolant comes up to temp fine now (it was taking 30 mins or so to get up to temp before it got changed!).As Jamie said, i have a sneaking suspicion that it's wiring. Just been out now and it's fine, wiggled wiring about and its back to it's derpy self. What would be involved then, re soldering it on again or something? Edited May 20, 2013 by Bluebear Quote Link to post Share on other sites
Amjad Posted May 20, 2013 Share Posted May 20, 2013 There might be dirt in the plugs, I had that on my headlight plugs once for some reason Quote Link to post Share on other sites
rob_bower Posted May 21, 2013 Share Posted May 21, 2013 This on the gt or n/a nick? Either way the temp gauge runs off 2 sensors the green coolant temp sensor and another smaller spade terminal type connector and from memory they both run to the ecu then the gauge so as above check connections and wires. If its on the n/a let me know and ill send the relevant wiring diagrams over. Rob Quote Link to post Share on other sites
Bluebear Posted May 27, 2013 Author Share Posted May 27, 2013 N/A got sold yonks ago Rob, yeah it's on the GT. Will take a look around tomorrow night cheers! Quote Link to post Share on other sites
rob_bower Posted May 28, 2013 Share Posted May 28, 2013 Ah yes I forgot dude. It still works the same way the 2 sensors take readings the larger green sensor an the smaller spade terminal like one. There the 2 you need to look at. Quote Link to post Share on other sites
sjbrowning7 Posted May 28, 2013 Share Posted May 28, 2013 My one to the gauge is all funny now too, I have checked mine and the connection just going into the connector looks like it's shot. I will have to repair this but yours is probably the same as mine. We are having pretty much the same problems at the same time lol Quote Link to post Share on other sites
Bluebear Posted May 28, 2013 Author Share Posted May 28, 2013 We're faulty coolant sensor bros now. Bonded for life etc. Quote Link to post Share on other sites
loz180691 Posted June 27, 2013 Share Posted June 27, 2013 Mine is doing the same mainly when it rains or wash the car Quote Link to post Share on other sites
Danza V Posted June 29, 2013 Share Posted June 29, 2013 I had this. Mine was the stat but, I also soubd the wire that feeds the signal to the gauge had just fell apart. My coolant temp sensor was non existent also. After I checked these and replaced it was fine Quote Link to post Share on other sites
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