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1990 BMW 735

Tiny
JACKX1962
  • MEMBER
  • 1990 BMW 735
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 197,000 MILES
Hello. I was wondering what would cause the water not to cerculate thru the radiator. I just changed the thermastat. All the hose. Everything gets hot exept the radiator. What would you recomend?

thankyou john
Thursday, April 9th, 2009 AT 9:25 AM

40 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
HI there,

get the radiator cleaned & flow tested, it may be part blocked and restricting flow, have you bleed the system of all the air, including the heater?

Mark (mhpautos)
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Thursday, April 9th, 2009 AT 9:28 AM
Tiny
JACKX1962
  • MEMBER
  • 29 POSTS
I flushed the system it is still doing it. I am thinking it is the waterpump because everything gets hot exept the radiator and the lower hose. And even the hose going from the waterpump to the heater core. Could this be the trouble. And how would you bleed it from air?
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Thursday, April 9th, 2009 AT 11:41 AM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Marks' suggestion is correct and if you have checked the bypass line that runs from the expansion tank to the radiator along the left side of the car for blockage then you should proceed with the inspection of the remaining componants in the cooling system. If the bypass line is blocked it will build pressure in the system and block coolant flow.
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Thursday, April 9th, 2009 AT 11:45 AM
Tiny
JACKX1962
  • MEMBER
  • 29 POSTS
I checked that hose when I diconected it. It was alittle clogged. I dont know how but how do I bleed the system. But why would the radiator stay cold the lower hose is cold and the top hose is really hot
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Thursday, April 9th, 2009 AT 4:41 PM
Tiny
DOCHAGERTY
  • MECHANIC
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The radiator may be full of "muck" (for lack of a technical term) and when the deposits form on the inside of the radiator, they block thermal conductivity. If this is the case, it may call for replacement of the radiator. To bleed the cooling system, open the screw on top of the thermostat housing and fill the system until there is a steady stream from the pee hole, then close the screw and top off the coolant, start the car and turn the heater to hot and idle the engine until operating temperature is achieved. Let cool and recheck coolant level.
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Monday, April 13th, 2009 AT 12:33 PM
Tiny
JACKX1962
  • MEMBER
  • 29 POSTS
Ok now that I have connected my battery back up. My radio is asking for a code how do I get this.
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Wednesday, April 15th, 2009 AT 1:23 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

if you don''t have the code in your radio hand book or owners manual, your BMW dealer will be able to advise the number, you will have to give them the VIN number, thats is how it works here in Aust. If its different there the Doc will pick up on this and let you know.

Mark (mhpautos)
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Wednesday, April 15th, 2009 AT 5:24 PM
Tiny
JACKX1962
  • MEMBER
  • 29 POSTS
Yes it is different here they want me to bring it in and charge me 150.00 . I was wondering if there is an easier way.
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Wednesday, April 15th, 2009 AT 8:10 PM
Tiny
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Post the serial number and I will try to get your code. BTW, thanks Mark.
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Wednesday, April 15th, 2009 AT 11:49 PM
Tiny
JACKX1962
  • MEMBER
  • 29 POSTS
Here is the vin # WBAGC431XLDC2666O that you for your help
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Thursday, April 16th, 2009 AT 7:32 AM
Tiny
DOCHAGERTY
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I need the serial number from the back of the radio.
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Thursday, April 16th, 2009 AT 1:35 PM
Tiny
JACKX1962
  • MEMBER
  • 29 POSTS
How do you take the radio out. I dont have a removal tool. I am new to the bmw world.
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Thursday, April 16th, 2009 AT 8:35 PM
Tiny
JACKX1962
  • MEMBER
  • 29 POSTS
I will take out the radio and post the serial number
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Sunday, April 19th, 2009 AT 8:28 PM
Tiny
JACKX1962
  • MEMBER
  • 29 POSTS
Oh and I bleed the system and checked the bypass it worked thanks for your help on that.
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Sunday, April 19th, 2009 AT 8:30 PM
Tiny
DOCHAGERTY
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It takes a special tool or a small Allen wrench. The flaps at the sides open up and expose the screw heads.
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Sunday, April 19th, 2009 AT 8:31 PM
Tiny
JACKX1962
  • MEMBER
  • 29 POSTS
I got the radio out. Here are all the numbers on the back BMW model ke-83 fccidajd4dike-83zbm spec# kh-us pkc0164797 I hope this helps
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Friday, April 24th, 2009 AT 1:48 PM
Tiny
JACKX1962
  • MEMBER
  • 29 POSTS
I got the radio out. Here are all the numbers on the back BMW model ke-83 fccidajd4dike-83zbm spec# kh-us pkc0164797 I hope this helps
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Monday, April 27th, 2009 AT 10:55 AM
Tiny
DOCHAGERTY
  • MECHANIC
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I am still working on it, back soon.
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Monday, April 27th, 2009 AT 11:02 AM
Tiny
JACKX1962
  • MEMBER
  • 29 POSTS
How did you make out with the code. And also I just found out my oil pan gasket leaks. How hard is it to change this? Does it mean lifting the motor?
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Wednesday, April 29th, 2009 AT 5:53 PM
Tiny
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It requires some special equipment and is often quite messy. Good on ya if you want to take it on, I would start with getting it CLEAN, nothing worse than working on a greasy, oily mess.
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Thursday, April 30th, 2009 AT 11:26 AM

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