Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

Reply
 
Thread Tools Display Modes
  #1  
Old 12-10-2007, 11:19 PM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
Heater control valve ?

How can you tell if your heater control valve is bad? Where is the relay for this valve located and how do you test it?

Thank You

RLG4675
Reply With Quote
Advertisement
  #2  
Old 12-11-2007, 12:05 PM
GacAttack GacAttack is offline
Registered User
Location: Twin Cities, MN
 
Join Date: Dec 2007
Posts: 17
Mein Auto: 1998 BMW M3 Convertible
no hijack intended, but I'm curious to see the answer, too. My front winshield defroster blower doesn't seem to work. I can hear it switch and move, but no air comes out. Rest of the HVAC works fine, just the upper vents.

Is this similar to the actual problem you're having?
Reply With Quote
  #3  
Old 12-11-2007, 04:28 PM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
No, I just bought the car and drove it 8 hours home with no heat at all! The heater,vent and defroster all blow cold air with no heat at all. I live in a area that gets snow so I really need heat. the temp guage reads in the middle and the engine is warm. I am stumped , the car has a new thermostat in a box in the trunk so I will install that and see if this fixes the problem first. I also read that air in the cooling system can cause problems as well, so I will bleed the cooling system at that time as well. The heater control valve still has me wondering ; How to check it and which of the relays is it's?
Reply With Quote
  #4  
Old 12-11-2007, 04:46 PM
rkrug rkrug is offline
Registered User
Location: new york
 
Join Date: Oct 2007
Posts: 20
Mein Auto: 318 ic
I just changed the heater control valve on the 318.
It was stuck in the open position , which means lots of heat . It is under the master cylinder on the left side of the car . You can unplug the electrical connector and use a multi meter to see if you have resistance between each coil and the common . I think the front pin was common for the 2 coils . Was your temp gauge straight up ?? Was the fan blowing air ??

Pretty easy to bleed the system , just loosen the little black screw on the radiator till fluid comes out .
Reply With Quote
  #5  
Old 12-11-2007, 08:52 PM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
Will this tell you if its open or closed? with the ohm meter. My temp guage is staight up and the fan blows air . the air is cold.
Reply With Quote
  #6  
Old 12-12-2007, 04:01 AM
rkrug rkrug is offline
Registered User
Location: new york
 
Join Date: Oct 2007
Posts: 20
Mein Auto: 318 ic
the ohm meter will tell you if the circuit is O.K. if the circuit is open then the valve is bad . I would think the valve would fail in a open position, thats what mine did . You may want to disconnect the connector and see if you get heat that way . If that works then you may have a control module problem . On my 96 ,voltage closed the valve and no voltage let the valve spring open .
Reply With Quote
  #7  
Old 12-12-2007, 05:10 AM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
Ok ,I will give that a try. Thank You and Happy Holidays.

RLG4675
Reply With Quote
  #8  
Old 12-12-2007, 11:19 PM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
I tested the valve to the best of what
I know. I tested the valve with a ohm meter and the prong closest to the motor is the only one showing continity. I dont know if that is good or bad? How did you get your hands in to that area ? On a 325i it's very tight in that area.
Reply With Quote
  #9  
Old 12-13-2007, 10:05 AM
rkrug rkrug is offline
Registered User
Location: new york
 
Join Date: Oct 2007
Posts: 20
Mein Auto: 318 ic
it has continuity between that pin and each of the other two correct ?? If so the valve sounds like it is good . On my valve it had continuity between the front pin and only one of the other .. the valve was always in the open position .... heat all the time . yes very tight .
Reply With Quote
  #10  
Old 12-13-2007, 04:18 PM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
No the continuity was only on or present when I touched the pin closest to the motor and a ground , not either of the other pins .So I guess the valve is bad?
Reply With Quote
  #11  
Old 12-13-2007, 04:54 PM
rkrug rkrug is offline
Registered User
Location: new york
 
Join Date: Oct 2007
Posts: 20
Mein Auto: 318 ic
you want to check continuity betweenn the pins ... hold one probe on the front pin and touch one of the other two pins to test , then try the third . your meter should give you a resistance value for each solenoid . If no value then the circuit has a open ... not good .
Reply With Quote
  #12  
Old 12-13-2007, 07:37 PM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
Ok I will try that , I think I have a bad thermostat as after I warm the car up I felt the hoses and the top one was warm/hot and the bottom is ice cold. Could the end resistor be at fualt as well?
Reply With Quote
  #13  
Old 12-13-2007, 07:56 PM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
Oops I ment the final stage resistor not the" end " resistor. Sorry about that!
Reply With Quote
  #14  
Old 12-14-2007, 08:30 AM
rkrug rkrug is offline
Registered User
Location: new york
 
Join Date: Oct 2007
Posts: 20
Mein Auto: 318 ic
Try disconnecting the connection to the heater control valve ... See if you have heat then .You stated before the temp gauge was straight up and you could feel air blowing out the ducts...
Reply With Quote
  #15  
Old 12-14-2007, 07:01 PM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
Yes the blower blows cold air . I unplugged the connector and still no heat just cold air.
Reply With Quote
  #16  
Old 12-14-2007, 09:22 PM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
I just checked the valve again and I have resistance on all 3 pins so I guess its good.
Reply With Quote
  #17  
Old 12-14-2007, 09:57 PM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
I spoke with a independant BMW shop owner and he thinks it is the final stage resistor . He said the resistor controls more than the heater fan.
Reply With Quote
  #18  
Old 12-15-2007, 10:25 PM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
Smile

Well I have solved the problem . I flushed the cooling system,changed the t-stat. And replaced the radiator(cracked where the top hose mounts). Then I discovered the water valve (secondary waterpump/ heater valve) is bad. I took it off and found the rubber plungers are bad and stuck shut.

This took more time and money than expected but now I have heat.

Thank You all for the help . I wish you all Happy Holidays

RLG4675
Reply With Quote
  #19  
Old 12-16-2007, 11:50 AM
rkrug rkrug is offline
Registered User
Location: new york
 
Join Date: Oct 2007
Posts: 20
Mein Auto: 318 ic
Is this the heater control valve you are talking about .. If not please explain .
Thanks
Reply With Quote
  #20  
Old 12-16-2007, 02:11 PM
rlg4675's Avatar
rlg4675 rlg4675 is offline
Officially Welcomed to the 'Fest
Location: Reno, NV
 
Join Date: Dec 2007
Posts: 141
Mein Auto: 1994 BMW 325 i, F350
Yes ,its the heater control valve . I found an article on Pelican Parts about removing the valve and cleaning it.
Reply With Quote
  #21  
Old 02-11-2008, 07:03 PM
Lance19 Lance19 is offline
Lance19
Location: Panama City Beach, of the Florida Panhandle
 
Join Date: Feb 2008
Posts: 11
Send a message via AIM to Lance19
Mein Auto: 1996 BMW M3
what exactly does the heater control valve do? i got a 96 BMW M3 with 56k miles and my heater sometimes doesnt turn on (at all) fuses are good, fan works fine, i live in hot ass FL, but its cold right now, sometimes i cant turn the heater on until the car is up to temp. and sometimes it doesnt matter. It never used to matter, long story short, it cut in and out for no reason, seems to act like the heat works a LITTLE when driving and taking off, but stops completely when slowing down or coasting. This is All ut sudden, Most the time it just seems to work when it wants to most often not even powering on or the heat will slowly come out but the gauge unit orange lighting goes out and green (buttons) stay on if i had previously pressed them. im not sure what the deal is, if that makes sense at? Can you Help? Q&A trouble shoot me? -Lance
Reply With Quote
  #22  
Old 11-17-2008, 06:24 PM
paddling_man paddling_man is offline
Registered User
Location: Indy
 
Join Date: Nov 2008
Posts: 2
Mein Auto: E36, 94 325i
Sorry for resurrecting an old thread but... very similar problem.

Blasting heat from the driver side - cold on the passenger side. (I could overcome this by pushing the driver side to the max heat detente.)

The sensor for the cabin and both sides of the heater (behind the computer) check out fine. Each rheostat for the dual climate control has variable resistance depending on position.

The heater control valve:

I've got 12 volts (higher when the alternator is on) between pin 1 & 2 and pin 1 & 3. I can make the voltage drop to zero if I turn the driver temp control to max heat.

Resistance between pin 1 & 2 and pin 1 & 3 is zero ohms.

After plugging all this back together (it sucks getting that temp control wedged up and down from the console!) I've found that the passenger side can now be modulated. I did do a bit of tapping on the top of the heater control valve. The driver side is still blasting heat.

I'm guessing I've got a driver side HCV plunger stuck in the open position, flooding the driver side of the heater core with warm coolant. Rebuild/unstick or replace... we'll see. Opinions?

Here's my confusion: What is appropriate across pin 1 & 2 and pin 1 & 3 on the HCV. Zero ohms of resistance? Some measurable resistance? Which means OK and which means a valve stuck...

Thanks in advance!
Reply With Quote
  #23  
Old 11-29-2008, 09:21 PM
lenparky lenparky is offline
Registered User
Location: Virginia
 
Join Date: Nov 2008
Posts: 2
Mein Auto: bmw 540i and 740i
Smile heater control valve was clogged near valves

symptons - only had some on drivers side, none on passengers side. 740IL diagnosed problem by feeling hoses 1 hose (feed to valve) was real hot, others were warm (drivers side) and cold (passengers) and realizing that either the heater control valves were malfunctioning, no juice to valves from climate controls or some other issue. removed heater control valve and quickly realized previous owners must have used radiator stop leak or some other crap and clogged it bad. reamed the gunk out through water hose ends and Now heat works great. the repair didnt cost me a nickel

hope this helps some people - its my first post. http://www.bimmerfest.com/forums/ima...ile3453453.gif
Reply With Quote
  #24  
Old 11-30-2008, 05:03 AM
jason_recliner's Avatar
jason_recliner jason_recliner is offline
Don't ask me, I'm a sofa.
Location: Lovely Tropical Melbourne
 
Join Date: Apr 2007
Posts: 1,181
Mein Auto: Bostongrün 1995 320i
Hi lenparky
Welcome to bimmerfest.
It's VERY rare here that people are helping on their first post rather than asking questions, so congratulations!

My HCV went a few months ago too, and is the only "problem" I've had so far. (My fault; the coolant was full of crap)
I tried to clean it up but it was a lost cause. Turned out the pistons were all jammed up, the rubbers were shot.
__________________

"The Reclinermobile" - 1995 320i Boston Green
A word on our sponsors: Iridium sparks thanks to NGK. Wheels will shortly be dressed once again by Yokohama C-Drive. Road is lit by Eagle-Eye 6000K HID, supplemented by 7000K CCFL Angel eyes. HB/Fog have selected to go with Philips 4000K BlueVision. Engine parts choose to slip with Castrol's 20-50 GTX2 dinosaur slime, renewed every 10,000km.
Reply With Quote
  #25  
Old 11-30-2008, 03:19 PM
paddling_man paddling_man is offline
Registered User
Location: Indy
 
Join Date: Nov 2008
Posts: 2
Mein Auto: E36, 94 325i
HCV replaced. Shredded forearm but regulated heat now. Sweeeeet...

Thanks
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump


All times are GMT -7. The time now is 09:58 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms