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.
two days ago I drove about 300 miles, mixed between city and freeway, it was probably 100 degree's or so outside....but she never got too hot. Once when sitting at idle the temp guage got to about 3/4 but the aux fan kicked on and cooled her right down.
The next day my coolant light came on and I thought from the heated drive the coolant might have just boiled out the overflow....so I topped it off and went on my way....
now day 3, just 12 hours after topping it off (and by "topping it off" I mean filling it to the fill line) the coolant light came on again....now, a little more worried, I checked the ground where I park and there is puddle of coolant....NOT behind the drivers side front tire. in the 12 hours between fills I only drove maybe 12 miles AT NIGHT. so she was lucky to get up to 1/2 on the temp guage...
in the few minutes I had before work today I let her sit and idle and I looked for where the coolant is comming from and the only leak I could find was here:
I couldn't see exactly where its was comming from, but it was dripping on this connector:
it dripped and dripped, but once the engine got to about 1/2 on the temp guage...the dripping seemed to stop, but I could be wrong, I only had a few minutes...
I've searched and the closest answer to my question I can find is this:
Originally Posted by Starmavin
There is a coolant ring on the throttle body that heats up the air from the valve cover vent, Check the hose and the ring, but don't remove the ring cover! It breaks easily and the gasket isn't going to be at the local parts house. I have seen many leaks from here in colder areas where salt is used on the roads.
the timing belt, tensioner pully, water pump, and all the drive belts are less than 12,000 miles old
There are 3 things you can do. One, fix it correctly by getting a new gasket for throtle body heater. Two, get a 180* U shaped piece of pipe and put it in the two hoses to bypass the housing on the TB. Three, get some hose long enough to join the fitting at the back of the block to the one on the thermostat housing to properly bypass the housing. One of the hoses comes from the rear fitting and the other goes to the thermostat housing.
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