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The BMW Range
5 Series
E34
E34 520 vs. 525
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<blockquote data-quote="seech" data-source="post: 197159" data-attributes="member: 4572"><p>integramania, just take a look at the black plastic area next to radiator cap. there should be a plastic screw there used to bleed rad. Usually ppl do not use proper coolant so the water is usually rusty. If it is leaking you can see rust colored stains so check that area. If got rust color then it is probably leaking. In any case, if rad has never been changed before I guarantee you will need to change soon. Plastic parts become brittle and start to break off. When I got my car I changed the hoses first. A part of the top plastic bit broke off then my mechanic removed the upper rad hose. Furthermore plastic expansion tank cannot be changed so need new rad. I wouldn't bother with used one as you don't know how old it is and it could be suffering same prob. New rad is from Behr. </p><p></p><p>Another thing. Make sure you ONLY use BMW coolant which is blue color. If you see green or any other color coolant it would be adviseable to flush it all out and replace with blue BMW coolant. There have been cases of failures associated with other types of coolant. Also, make sure you DO NOT overfill the expansion tank. You should only fill to COLD level indicated at the side of the tank. You will need to fill to max when you first install new rad to get rid of air but after that use cloth or something to remove excess until proper level. Too much water can lead to too much pressure and may cause new leaks.</p><p></p><p>I bought my car with 340k km. The previous owner changed the engine in 2004 so I thought it would be ok. As long as you are happy with the condition then I say go for it. Worn out parts can be changed. Problems can be fixed. I would definately make sure interior plastic bits are all ok as they can be difficult to find. Air con also expensive to fix if not working. For me, I wanted the car body and interior to be in excellent condition. The other parts not so critical to me as I already decided to replace and fix what is required.</p><p></p><p>Hope this helps. I oso not expert but learn a lot before buying my E34. Still learning....</p></blockquote><p></p>
[QUOTE="seech, post: 197159, member: 4572"] integramania, just take a look at the black plastic area next to radiator cap. there should be a plastic screw there used to bleed rad. Usually ppl do not use proper coolant so the water is usually rusty. If it is leaking you can see rust colored stains so check that area. If got rust color then it is probably leaking. In any case, if rad has never been changed before I guarantee you will need to change soon. Plastic parts become brittle and start to break off. When I got my car I changed the hoses first. A part of the top plastic bit broke off then my mechanic removed the upper rad hose. Furthermore plastic expansion tank cannot be changed so need new rad. I wouldn't bother with used one as you don't know how old it is and it could be suffering same prob. New rad is from Behr. Another thing. Make sure you ONLY use BMW coolant which is blue color. If you see green or any other color coolant it would be adviseable to flush it all out and replace with blue BMW coolant. There have been cases of failures associated with other types of coolant. Also, make sure you DO NOT overfill the expansion tank. You should only fill to COLD level indicated at the side of the tank. You will need to fill to max when you first install new rad to get rid of air but after that use cloth or something to remove excess until proper level. Too much water can lead to too much pressure and may cause new leaks. I bought my car with 340k km. The previous owner changed the engine in 2004 so I thought it would be ok. As long as you are happy with the condition then I say go for it. Worn out parts can be changed. Problems can be fixed. I would definately make sure interior plastic bits are all ok as they can be difficult to find. Air con also expensive to fix if not working. For me, I wanted the car body and interior to be in excellent condition. The other parts not so critical to me as I already decided to replace and fix what is required. Hope this helps. I oso not expert but learn a lot before buying my E34. Still learning.... [/QUOTE]
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E34 520 vs. 525
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