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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 12-05-2009, 07:39 PM   #1 (permalink)
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Question 1988 325Ic temp sending unit problem

hi, everyone I'm new to BMW world, I just rebuilt the engine in a 325 I convertible I bought for my wife, It has been a fun and stressful at times project. Like my current issue, I just replaced the original temperature sending unit in the therm housing, I replaced it because the gauge was reading HOT at all times. So I figured the sending unit was bad so I bought the brown unit and the blue one and replaced them both,and it still goes right to HOT, the gauge is good, I checked it by grounding the wire, off and on to watch the gauge go cold to hot, worked fine, what dose anyone think of this ?
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Old 12-05-2009, 09:16 PM   #2 (permalink)
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1988 325iC

sounds you are not sure.... YOU just rebuilt or did you HAVE it rebuilt and you PAID for it...which is it?
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Old 12-05-2009, 09:23 PM   #3 (permalink)
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OK here..

So you rebuilt a BMW 2.5 litre engine by your own hand and are confused by a thermostat?.....you don't seem to know what that means...come on here
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Old 12-05-2009, 09:25 PM   #4 (permalink)
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you know what

I think your full of it and don't know even closely what you are speaking of
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Old 12-05-2009, 09:31 PM   #5 (permalink)
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Guys

YES I REBUILT THE ENGINE, and yes myself. and what the temp gauge is doing I have never seen before, I have read some other helpful treads and they tell me that their are batteries on the gauge pod that need to be replaced. Sorry guys this is my first BMW I have ever worked on, It runs great now but the temp sending unit was clearly giving me false reading. thanks for your interest
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Old 12-05-2009, 09:41 PM   #6 (permalink)
OMFG another one!?
 
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sled, you mind lightening up? Can maybe you (OP) try another sender or maybe have it tested at an auto parts store.
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Old 12-05-2009, 09:54 PM   #7 (permalink)
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Originally Posted by jjuken View Post
YES I REBUILT THE ENGINE, and yes myself. and what the temp gauge is doing I have never seen before, I have read some other helpful treads and they tell me that their are batteries on the gauge pod that need to be replaced. Sorry guys this is my first BMW I have ever worked on, It runs great now but the temp sending unit was clearly giving me false reading. thanks for your interest
Hey jjuken, I found this.....maybe it will help you.

erratic temp gauge E30 M3 - BMW CCA

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Old 08-09-2012, 08:53 PM   #8 (permalink)
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I have talked to a few guys and have been told that many 325i's run hot,,,,mine runs between the 1/2 and 3/4 and sometimes near the red. I too have changed the thermostat and heat sensor and am still having problems.
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Old 08-12-2012, 02:23 AM   #9 (permalink)
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Originally Posted by jjuken View Post
YES I REBUILT THE ENGINE, and yes myself. and what the temp gauge is doing I have never seen before, I have read some other helpful treads and they tell me that their are batteries on the gauge pod that need to be replaced. Sorry guys this is my first BMW I have ever worked on, It runs great now but the temp sending unit was clearly giving me false reading. thanks for your interest
Yes there is a battery in the instrument cluster. Im pretty sure, however, it is not for the gages, it is merely for the service interval circuit, it keeps it alive so it keeps the time from when it was last reset to the time to reset when the car is not turned on. The service interval goes off of time, or mileage, one of the 2. And the little chip on the service interval circuit for the service/oil change lights requires a tiny bit of power at ALL times in order for it to function properly and keep the data for the lights to change/come on when theyre sposed to. This battery, also, is a rechargeable lithium unit, and charges when the circuit has power going through it. As far as the temp gage issue, you have an open somewhere in the circuit, or probly more likely in the temp sensor. It COULD very possibly be a faulty one. those kind of things happen from time to time. Me and a friend got some rod bearings recently for his MR2, and we blew one up in 1 mile despite going VERY LIGHTLY on the gas pedal and not giving it much gas. We think the bearings COULD have been defective.

EDIT: ALSO those 2 temp sensor cables LOOK the exact same. BUT one has 2 wires and the other only has ONE wire. If you hook them up to the WRONG sensors, meaning 1 pin connector to 2 pin sensor, and vice versa, neither one of the 2 circuits will function properly. the 2 pin one is for the ECM(if I remember right) for fuel control and open/closed loop operation, the SINGLE pin sensor is for the GAGE. Hook them up backwards, and the ECU will NOT go into closed loop operation and WILL NOT control the fuel properly, and the gage will not function properly either.

Last edited by m20enginebuilder; 08-12-2012 at 02:27 AM.
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