Author Topic: Thermostat and Coolant Bleeding Issues (Read 35705 times)

monty23psk · « **Reply #30 on:** September 15, 2009, 11:15:43 AM »

Using the ETM, I looked it up, brown/green is oil, brown/violet is temp sensor. Hope that helps. You can always just unplug one. They are just sensors, which keep the temp guage dead is the right one.

iamcreepingdeath · « **Reply #31 on:** September 15, 2009, 11:21:34 AM »

just unscrew one, if oil squirts out, its the oil pressure sensor. If coolant squirts out, its the coolant temp sensor.

But thanks, johnwoo, for the pic, until now, i didn't know where the sensor was located.

johnwoo · « **Reply #32 on:** September 15, 2009, 04:56:28 PM »

Quote from: iamcreepingdeath;78464

just unscrew one, if oil squirts out, its the oil pressure sensor. If coolant squirts out, its the coolant temp sensor.

But thanks, johnwoo, for the pic, until now, i didn't know where the sensor was located.

o it was monty that posted the pic.
thanks for the pic and help monty

monty23psk · « **Reply #33 on:** September 15, 2009, 08:53:06 PM »

Anytime guys. Learned alot while rebuilding the engine. Car was starting to over heat so I just decide to rebuild it before damage happened.

Cobra Jet · « **Reply #34 on:** September 16, 2009, 11:21:28 AM »

Common occurance for the temp needle bouncing (besides a bad sending unit) is a loose nut on the back of the cluster that secures that gauge to the cluster. You have to reach in there and tighten the nut, which will and should stop the temp needle from boucing or twitching (this has been posted in a few temp gauge threads on here). If the gauge still twitches or bounces after that, then you need to replace the temp sending unit on the side of the head.

iamcreepingdeath · « **Reply #35 on:** September 17, 2009, 03:43:09 PM »

yes, Monty, thanks for the pic, i just went up one post and saw the pic and thought it was john's.

so anyway, new development (again).

My water pump is now shot. I had thought a while back that it was going, because i would hear strange buzzing or rattling sounds from the pump area when i was re-filling the coolant, and then all of a sudden coolant started leaking out around the pump like crazy. So i ordered a new pump. I have my temp sending unit now, but installing it would do me no good before i get the new pump in, which gets here on Saturday. So i will definitely update this thread then.

Oh, and on the sensor location question, i think both those sensors are temp sensors. One for the DME and one for the gauge cluster. Check out this post in my other thread: http://www.m42club.com/forums/showpost.php?p=78534&postcount=22

johnwoo · « **Reply #36 on:** September 18, 2009, 01:36:57 AM »

crap i just ordered all these parts and forgot to get the brown sensor. now im gonna get raped on shipping

monty23psk · « **Reply #37 on:** September 18, 2009, 11:32:53 AM »

One sensor is oil and other coolant. I know this and many do as when if you swap them, the oil light stays on and the needle is dead. It happened to me when I installed everything after rebuilt. There is another coolant sensor the the computer I believe. Just can't remember where. Normally it is on the exhaust side of car, but for what you are troubleshooting, irrelevant.

iinkhole · « **Reply #38 on:** September 18, 2009, 01:30:36 PM »

Hi, i am new on here my 92 e36 318is temp gauge is not working sum times it will stay just below hot when engine is cold or it will not even be on the scale. it seems its all or nuffink. i have replace temp sensor the 2nd 1 in the head i believe the first 1 closest to front of engine is for ecu, a complete engine flush and new coolant plus new thermostat and also replaced the cluster gauge with a second hand 1. and of course checked all the fuses. heaters blow hot air fine. how would i test the wires? its been like it since i brought the car about year ago. but its now annoying me!! any help would be great.

also have done the cluster check i have heard about when you hold the trip button and turn key to pos 1 and the gauges go to max and back to zero this worked including the temp gauge. looks cool but i am still stuck!!!

johnwoo · « **Reply #39 on:** September 18, 2009, 09:23:11 PM »

Quote from: monty23psk;78622

One sensor is oil and other coolant. I know this and many do as when if you swap them, the oil light stays on and the needle is dead. It happened to me when I installed everything after rebuilt. There is another coolant sensor the the computer I believe. Just can't remember where. Normally it is on the exhaust side of car, but for what you are troubleshooting, irrelevant.

so its not a temp sensor but an oil sensor. what about that diagram from realoem where it says its a temp sensor, im confused.

monty23psk · « **Reply #40 on:** September 18, 2009, 09:47:44 PM »

You are correct, I confused it with the one on the oil filter housing. I know the wire color is correct. One is for the ECU and the other for the temp gauge. Also in that position, wouldnt make sense that oil was running through there.

I just has a small lapse. Thanks for clearing it up.

iamcreepingdeath · « **Reply #41 on:** September 21, 2009, 03:37:44 PM »

ok dudes, i installed the new water pump and new sensor, no change at all. Well, there is no more coolant leaking out, but still the same situation with the needle going almost to the 3/4 mark, and the really bad cold idle.

johnwoo · « **Reply #42 on:** September 23, 2009, 12:19:23 AM »

Quote from: iamcreepingdeath;78721

ok dudes, i installed the new water pump and new sensor, no change at all. Well, there is no more coolant leaking out, but still the same situation with the needle going almost to the 3/4 mark, and the really bad cold idle.

did you change both of them?

iamcreepingdeath · « **Reply #43 on:** September 23, 2009, 10:56:14 AM »

both sensors? no, just the one for the DME, not the one for the actual temp gauge. SO that is my next step, along with a Mustang O2 sensor.

johnwoo · « **Reply #44 on:** September 23, 2009, 11:10:39 AM »

im thinking maybe your gauge is reading wrong.

i don't know about your weird idle maybe time for new icv. i still have to order the second sensor too the one located closer to the firewall.