Im a first time BMW owner. I bought a 316i E36 2 weeks ago. The owner at the time told me that the water pump had been changed. 2 days later I was in my car and the engine was running idle for about 25 minutes. All of a sudden, steam was coming from under my bonnet and anti-freeze was all over the place. The radiator was damaged and I had to get a new one fitted. By getting the radiator changed I thought things would be better now. I was in my car a couple of nights back and the engine was running idle for about 30 minutes. I noticed that the temperature needle started to increase above the desired temperature. As I started to drive off the needle went back down again. Is there a serious problem with the engine now thats causing this?
Does your car have an electric fan for the radiator? If it does check to see it it is running when the needle starts to get above the desired temperature. If it doesn't you'll probably need a new cooling fan or relay.
If you've just had your pump changed then i'd say thermostat. What are you heaters like? Do they blow hot air? If they keep blowing cold air even when the engine temp is normal, then you might have a problem. But a thermostat can be an a DIY ob if your ok with engines, its an easy fix. That, or you got another problem with the 'new' pump.
I have a 318is and when the car would idle for any amount of time the temp would go through the roof! The temp gauge kept going up and the fan would never turn on. Finally to deal with it until I figured out the problem I would turn on the A/C to get the fan moving. No matter what if you turn on the A/C the defalt is for the fan to run to pass air over the condenser. If this works like it did on mine than the temp sensor on the radiator, to the right side, needs to be replaced. I found out that this sensor controls the low and high fan speeds to keep your temp under control when you are not moving. Your symptoms are identical to mine and the new temp sensor was my remidy. This sensor was relatively cheap from the stealership.
You mentioned the previous owner said he replaced the water pump.
Did you verify that a new water pump was actually installed? Either with an invoice or have a mechanic look into it?
If the temperature goes down when you drive then goes up when you idle means the coolant is being moved. I'd say check your thermostat and water pump seal or bearing.
You also mentioned idling the car first for 25 minutes, then after replacing the radiator idling for 30 minutes. Even though the car is designed to withstand high idling temperatures these seem to be rather long idling periods, which is not good for any car. Is this a habit or are you forced to idle for these long periods? You are or will be damaging something, if not now then soon.
__________________ 1996 E36 M44 318i 5sp LSD
I would be looking at the fan clutch. With the car at a stop or not moving there is no air comming onto the engine. But when you start moving again there is an increase flow of air, if u understand wat i mean
As I know this is a old post, I was wondering if anyone could help me out here. I just recently got my car rebuilt motor and clutch. The car had a problem with over heating so I had to get the entire engine rebuilt. Anyhow I got the car back and wow what a difference compression and a new clutch can do. However I let it idle for about 25 minutes and the car started to overheat. I turned the AC on and the temp went down. I turned it off and checked to see if the fan would turn on. No luck. Jumped the fan and all was fine, but no heat inside. Went out to the Stealership and purchased a new Temp Sensor. Giving the fan will turn on with a jumper and with AC just not when the car gets hot. Replaced this, and still the fan does not turn on with heat. Although I did not run the car until it got hot, cause I was affraid of blowing the newly rebuilt motor. Any ideas what can be happening. Should I just run a switch to manually turn the fan on and off? Any help or clues would be helpfull, thanks.
Number one, make sure the system is bled properly. E36's are notorious for being very hard to bleed all the air out. If it is bled properly, replace the thermostat and then rebleed. Then last, the temp sensor. The auxiliary fan is made to come on when the A/C is turned on and when it gets really, really hot outside. Like in the summer in bumper-to bumper traffic. Maybe not be hot enough to turn on now. The engine fan may be bad, but with the engine running, you can tell if it's turning or not.
__________________ 1995 325I, window tint, K&N, debaffled airbox, BMW #104 wheels, Nighthawk low beams, smoked side markers, smoked corners, smoked taillights, M3 stlye heated mirrors, various interior bits, Bosal cat-back.
Well thats the thing. The fan turns on when I turn the AC on, also the fan turns on when I jump it. This thing is driving me crazy.. The thermo is new from factory the water pump new, the radiator new. I duno. I just dropped the car at the shop again, i have not been able to drive my baby with the new head and clutch. ... Problem with leaving the fan jumped is that i dont get heat inside. Its warm but not heat. Bob318 I feel for you man, this is driving me crazy to. Especially after throwing another 3 grand into the car.
you just gotta haul ass once you get going and your car cools down fast. Thats how i deal with the problume. It sucks when its 15 below and you cant start your car or it will over heat. Damn germans! haha.
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