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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

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  #1  
Old 12-20-2012, 06:46 PM
bimmernewbie719 bimmernewbie719 is offline
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Location: BUFFALO NEW YORK
 
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Mein Auto: 95 325I
heat issues=/

Okay so i live in wonderful buffalo, and of course we all know the winters here are harsh, i just purchased me 95-325i about 3 weeks ago, with it being cold here i obivusly need heaty, the thing is i only get heat if the car is in motion, if i am not moving the air is as freezing cold as it is outside, now i dont know much of the history of this car except the pervious owner restored it to decent condtion from what some punk kid did to it before, but anyway about week one into owning the car i was sitting idle for about 20min waiting for my girlfriend to get out of work and i noticed the car over heated, it hasnt done it since that day but since then i have this heat issues, now ive searched the fourms for somthing similar to this and found nothing so my question is, is it the blower motor or a heater core, any help will be apperciated, thank you very much guys, if you need more info please let me know!
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  #2  
Old 12-20-2012, 07:45 PM
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jonesin jonesin is online now
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Mein Auto: '96 328is Cosmos
1. When was the entire cooling system last replaced? If the answer is either "I don't know", or "More than 75k miles ago", then replace it all. (Yes, all of it.) Radiator, upper rad hose, lower rad hose, bleeder screw (replace with brass one), expansion tank, radiator cap, thermostat, thermostat housing (replace with aluminum one), fan, both serpentine belts, water pump (replace with one with metal impeller). Make sure to use only BMW (Or Zerex G-05) coolant mixed 1:1 with distilled water.

2. For the current heat issue, odds are you have air trapped in your cooling system.

3. Google "Bleeding E36 Cooling System + Pelican DIY" and follow the procedure they describe and you should be good to go.
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  #3  
Old 12-20-2012, 07:47 PM
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drivinfaster drivinfaster is online now
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check your coolant level, if you are low you have a leak. find it, fix it. hope you didn't do any damage when it ran hot.

there are lots of threads to service the cooling system, so read up them if you are a diy'er.




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  #4  
Old 12-20-2012, 08:47 PM
tchavera tchavera is offline
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well of course replaced cooling system blablabla.. you're gonna get attacked on this site until you do so. (of course if you did replace you wouldn't have this problem). but i couldn't agree with df more. sounds like low coolant!!
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  #5  
Old 12-21-2012, 03:25 PM
john kaminski john kaminski is offline
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Could be broken/stuck thermostat, like I had with my 94 325i
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  #6  
Old 12-22-2012, 09:41 AM
monko141 monko141 is offline
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Location: sutherlin oregon
 
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Mein Auto: 94 325is,91 318is x2
If you have heat in motion and your heater starts blowing cold when you are sitting at an idle it is this valve. http://bmwfans.info/parts/catalog/E3...ve_water_hose/ Part #1
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  #7  
Old 12-22-2012, 11:10 AM
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ZeGerman ZeGerman is online now
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Quote:
Originally Posted by monko141 View Post
If you have heat in motion and your heater starts blowing cold when you are sitting at an idle it is this valve.
Given the symptoms described, rather than the heater valve, it's actually much more likely to be due to low coolant, trapped air, or t-stat stuck open as mentioned above.
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Last edited by ZeGerman; 12-22-2012 at 11:12 AM.
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  #8  
Old 12-22-2012, 11:18 AM
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E36 Phantom E36 Phantom is offline
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If the air keeps blowing, but cold, it's not your blower motor.

The heater core is the easiest place for air bubbles to get trapped and never get out. Tough to bleed. You need to get the car on an incline, turn the HVAC to full hot, and bleed from there.

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  #9  
Old 12-27-2012, 03:13 AM
N:CR41G N:CR41G is offline
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Mein Auto: 1997 BMW 318is E36
Still here Chad? Jeez... Its been years!
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  #10  
Old 12-28-2012, 12:23 PM
BimmerBoy1986 BimmerBoy1986 is offline
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Mein Auto: 2007 335i Sedan
Could be a host of problems. Here's a list had an overheat myself last month.
Check the two tubes coming from your radiator one should be cold the other should be warm.
If not you water pump has prob failed. Make sure to change the t-stat while under there.
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