1992 BMW 525i engine gets hot

Tiny
CWESTON142
  • MEMBER
  • 1992 BMW 525I
Hello I had a problem with my heat blowing out inside my car and I let the wrong person look at it and they decided it was my coolant tank which I ended up having to replace the radiator and my engine got hot so I replaced the thermostat and im still having a problem with the engine getting hot and it putters I have no idea what the problem is next and im no where in an area that has bmw mechanics?
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Monday, September 2nd, 2013 AT 8:30 PM

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Tiny
CARADIODOC
  • EXPERT
That is one major sentence! With no punctuation it can read at least three different ways, but I can't make sense of it no matter how I read it. First of all, what led the mechanic to the coolant reservoir? Was it leaking? What led you to replace the radiator and thermostat? Apparently whoever did that was also the wrong person to work on the car. The thermostat is a very low-failure device but given the age of the car, the radiator could have corroded cooling fins. The clue is the overheating will be worse in hotter temperatures and at highway speed, and running the heater on the highest temperature and one of the higher fan speeds will bring the engine temperature down?

On many engines you have to bleed the air out of the cooling system after the thermostat or radiator are replaced. If that isn't done an air bubble can form under the thermostat. Thermostats don't open in response to hot air. They must be hit with hot liquid. If it doesn't open, the air can't bleed out to the reservoir. Look for a bleeder screw on or near the thermostat housing. If there isn't one there, look for a sensor that can be unscrewed while you fill the system.

If no other cause of the overheating can be found, have your mechanic perform a chemical test at the radiator for a leaking cylinder head gasket. That will also introduce air into the cooling system that will prevent the thermostat from opening.
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Monday, September 2nd, 2013 AT 10:35 PM
Tiny
KNOWLEDGE IS POWER
  • EXPERT
Don't let the previous post bother you. Your post was fine. Anyway, if your having to add coolant you may have a blown head gasket. I say that because you say the car putters. The exhaust will smell sweet but burn your eyes if theres coolant burning off in there. As the coolant enters the combustion chamber, it's not supposed to do that, it causes a misfire or putter as you call it
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Wednesday, January 29th, 2014 AT 3:51 PM
Tiny
CWESTON142
  • MEMBER
Thank you! That answered my question. I figured it was the head gasket set, but I wasnt forsure. Now I know what I need to do next!
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Thursday, January 30th, 2014 AT 8:30 AM
Tiny
KNOWLEDGE IS POWER
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Youre very welcome!
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Thursday, January 30th, 2014 AT 3:10 PM

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