Question about 1997 BMW 328

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Series 3 1997 2.8 i have a problem with water leak but not visible it feels like water is not going round the system where is the water pump

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The hardest leak to see is the weep hole on the bottom of the water pump. You won't know for sure that it is leaking out the weep hole until the fan is off, the serpentine belt is off, and the pulley is off so you can see the bottom of the water pump.
The water pump is in the front of the engine block, directly behind the fan.
A 1997 328 is due for virtually every component in the cooling system unless you know for a fact that the component has been recently replaced. For example, you must be on at least your second radiator, so if the current radiator is less than 5 years old, it probably has a few more years in it. However, on a '97, you should be on your second overflow reservoir, your second set of hoses (and that means ALL the hoses, including the tough to reach ones behind the engine and under the intake manifold), your second thermostat and housing, your second water pump, and your second radiator.
Not part of the cooling system, but if you have not replaced the rubber boot on the throttle body, you might as well order one of those while you are at it because I promise you it is cracked.
I own two '97 328s, one with 175k miles and one with 275k miles, and they both have had everything in the cooling system replaced at least once.
If you want to do this yourself, you will have to buy or make a tool to hold the pulley still while you loosen the fan. The fan nut is left-handed thread. Oh yes, if it has not been replaced, you are probably due for a fan clutch as well.
If you have an automatic transmission, I find it easier to leave the transmission cooler in the car when I pull the radiator, but be careful not to inadvertently pull the transmission lines out of it or you will dump transmission fluid all over the floor. Refilling this transmission and getting the level correct is a hassle.

Posted on May 18, 2011

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    • 1 Park your car overnight and put a large white piece of paper underneith your car. In the morning check the paper. If the paper is wet with liquid, you could have a water pump leak.
    • 2 If the paper has green (in most cases) fluid on it, there is a good chance your vehicle is leaking coolant (sometimes refered to as "water"). In many cases, when you are leaking coolant it could be coming from the water pump.
    • 3 Turn the engine off and open the hood.
    • 4 Locate the water pump pulley. The pulley is the round part that the belt is attached to. To find it, look for the belts. You will see more than one pulley. Your car will have an alternator with a pulley and perhaps an air conditioner, power steering and smog pump pulleys. If you are unsure, ask your mechanic to point out the water pump pulley.
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A LEAK IN THE RAD. SYSTEM. LOOK FOR WATER LEAKS. RUN YOUR CAR UNTILL IT IS HOT THEN FEEL THE RADATOR ON THE INSIDE AT THE BOTTOM IF IT IS COLD THE RAD. IS STOP UP... CHECK THE FAN CLUTCH MAKE SURE IT IS WORKING .......
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I have 1998 740i BMW that is overheating. 1) What are the warning signs of a bad water pump? 2) What are the warning signs of a blown head gasket? 3) What are the warning signs of bad timing?


Timing - engine is not sounding right or back firing.
Head gasket - water and oil mixing, see inside water bottle. or open bottle. rev engine when cold, if starts spitting water out while cold like a fountain.
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Remember - Block radiator lines can also cause over heating problems and lack of water circulation.

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Water pump replacement-putting it back in and setting the timing.


  1. Step 1 Park your car overnight and put a large white piece of paper underneith your car. In the morning check the paper. If the paper is wet with liquid, you could have a water pump leak.
  2. Step 2 If the paper has green (in most cases) fluid on it, there is a good chance your vehicle is leaking coolant (sometimes refered to as "water"). In many cases, when you are leaking coolant it could be coming from the water pump.
  3. Step 3 Turn the engine off and open the hood.
  4. Step 4 Locate the water pump pulley. The pulley is the round part that the belt is attached to. To find it, look for the belts. You will see more than one pulley. Your car will have an alternator with a pulley and perhaps an air conditionermag-glass_10x10.gif, power steering and smog pump pulleys. If you are unsure, ask your mechanic to point out the water pump pulley.
  5. Step 5 Grab opposite ends of the round pulley and check for "play" (looseness): Try to rock it back and forth. There should be no give. If there is, the bearings are going and it's time to replace the water pump. By the time you can feel play in the water pump pulley, you may also be able to hear the bad bearing when the engine is running - there may be a low-pitched grinding noise coming from the water pump pulley.
  6. Step 6 Visually check the water pump (it's located behind the pulley) for signs of a coolant leak. If the water pump gasket is leaking, it must be replaced. This is a good time to get a new water pump, too, unless it was just recently replaced

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if you're adding water...it's leaking somewhere. Have the cooling system pressure tested. if no visible leak, it's probably leaking internally (head gasket). very expensive to fix

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There is a low (refrigerant) pressure switch in series with the A/C clutch control - if the gas pressure is too low, it inhibits clutch control.

Get the system topped up with refrigerant and checked for leaks.
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