dabby dunkerton Posted June 18, 2015 Report Share Posted June 18, 2015 alright im stumped on this one guys my car was overheats regardless of high low speeds so i decided the first thing to do would be to pull the thermostat out and see if that fixed the problem.At first the cars temperature came down and it was a little under 3/4 on the temp gauge then i parked and turned the car off for a minute but to my suprise when i turned the key on to see the temp it was redlined!! even after the car say for a good 30 minutes the gauge was still redlined?? do you think this is possibly the gauge is just wrong? the car doesnt leak antifreeze and is toped off, also ive noticed the top radiator tube doesnt get very hard could this be due to no thermostat installed Quote Link to comment
petercscherer Posted June 18, 2015 Report Share Posted June 18, 2015 You may also have an air-pocket in your cooling system somewhere. Usually removing the thermostat is not recommended, only replacing it.... Quote Link to comment
scooter Posted June 18, 2015 Report Share Posted June 18, 2015 Does it feel super hot? It may be the guage. Getting hotter after shut down is just an effect of heat soak, and is normal. If your top hose isnt hard, and you can put your hand on it, id definitly say your guage is wrong, or you have no coolant lol. In my experience which has only been with the 4 banger l motors, is they dont really seem to get air locked.maybe its different on the z's If its puking coolant into your overflow and the hose isnt hard, then the rad cap needs to be changed. If it has a hard hose and is venting into the overflow, you could probibly not touch the hoses for more than a second or two. Aka fucking hot. The rad hose should still get hard with no thermostat, it gets hard due to the themal expansion of the coolant itself, not the flow. Unless theres alot of air in the system which you make it sound like there isnt. Ive ran cars without thermostats lots, most cases it just takes forever to get to a stable temperature. Your milage may vary. Quote Link to comment
dabby dunkerton Posted June 18, 2015 Author Report Share Posted June 18, 2015 Hey guys its been twelve hours and the car is still reading 250 so its defiantly the gauge Now how do i know if its the gauge or the sending unit? any tips would be super appreciated! Quote Link to comment
Slowpoke Posted June 18, 2015 Report Share Posted June 18, 2015 Do some work homie!0. Stop driving the car!!! If your gauge is accurate, you are running a high risk of warping the head!!!1. Read FSM diagnosis2. Get off the internet and in the garage, check coolant for oil and oil for coolant, check for white smoke from the exhaust, check for obvious leaks3. Pressure test coolant system4. Test compression5. Test coolant for exhaust gas with block tester6. Check to make sure gauge is accurate, use a different gauge, thermometer or one of those lazar temperature readers things7. Check your brakes, If one is locked up or severely dragging you can cause an overheat situation (I have had this happen to me)7. Flush and clean coolant system, replace or refurbish radiator8. Check water pump and fan clutch operationScooter is right, the water temp will continue to rise on hot days after the car is shut down. I let mine cool off by driving in the low RPM for a couple of blocks before shutting it down. Like a cool off lap. If you follow the steps above, you should come to a solution. Quote Link to comment
Z-train Posted June 18, 2015 Report Share Posted June 18, 2015 You may also have an air-pocket in your cooling system somewhere. Usually removing the thermostat is not recommended, only replacing it....Nope. Quote Link to comment
Z-train Posted June 18, 2015 Report Share Posted June 18, 2015 Get a IR gun and shoot all the cooling system parts.A new sending unit is available only from Courtesy Nissan(ask for Datsun parts)Part # is 25080-89900 Quote Link to comment
datzenmike Posted June 18, 2015 Report Share Posted June 18, 2015 Pull the sender wire off the thermostat. Does the gauge still read full hot? NO...... Sender is at fault YES.... Gauge or wire to the sender is pinched and grounded. Does the fuel gauge read FULL tank? YES..... both gauges read full hot and full tank. Gauge voltage regulator is not working properly. NO...... problem is only in the temp gauge section. Quote Link to comment
dabby dunkerton Posted June 23, 2015 Author Report Share Posted June 23, 2015 all good now it was the temp sensor thanks guys! very easy to replace Quote Link to comment
Phantom Posted June 23, 2015 Report Share Posted June 23, 2015 Did you check with Motorsport Auto? http://www.thezstore.com/page/TZS/CTGY/classic15s Their units are only $10.83. Quote Link to comment
dabby dunkerton Posted June 27, 2015 Author Report Share Posted June 27, 2015 Did you check with Motorsport Auto? http://www.thezstore.com/page/TZS/CTGY/classic15s Their units are only $10.83. i went to autozone and it was only 12.92 so not bad! that website usually taxes on everything i didn't even think to check there lol too damn expensive Quote Link to comment
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