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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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Old 02-23-2019, 08:53 AM
vnadonza vnadonza is offline
Location: san francisco
Join Date: Jun 2010
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Mein Auto: m3
98 bmw m3 heating

help with my BMW 98 m3 heating. N0 heating inside but sometimes heating comes on and works. Anybody have this problem and was able to fix problem. Appreciate the help especially with weather.
Bimmerologist vnadonza 98M3
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Old 02-23-2019, 09:25 AM
spyderg0d spyderg0d is offline
Screamin demon
Location: oneida, ny
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Mein Auto: 1995 325ic
Heater valve is stuck.
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Old 02-25-2019, 04:52 PM
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ZeGerman ZeGerman is offline
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If the temp gauge is even a millimeter lower than 12 o'clock after about ten minutes of driving, your lack of heat is due to a thermostat that's stuck open. Very common in these cars.

If your temp gauge struggles to get to 12 o'clock or sometimes gets there but goes back down a bit, you need to replace your t-stat, not the heater valve.

1998 BMW 328is
1966 Pontiac GTO
2007 Subaru Impreza 2.5i 5-door
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Old 02-25-2019, 05:35 PM
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drivinfaster drivinfaster is offline
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Originally Posted by spyderg0d View Post
Heater valve is stuck.
heater valves usually fail to "heat all the time".

first things first, check the coolant level. if it is fine, then proceed with karl's suggestions. an infra-red thermometer gun is a great way to get quick, accurate readings, and wil also work for ac diagnostics....

if you check the coolant level and it is low, then find and repair the leak.

please note, the plastic components are notorious for breaking, so if something like a connector is damaged, deteriorated, cracked, or otherwise in poor condition, replace *everything*.

these engines can be difficult to bleed, but it is possible. i use a funnel set up for bleeding the cooling system, others like to raise the front end. regardless, always double check after cooldown to ensure the coolant level is correct.

yes, it will be costly, but you will no need to worry about it for quite some time. otherwise, it's a ticking time bomb,....lots of links and hints in the diy sticky, even of you are not a diy'er.

good luck.

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Old 02-28-2019, 01:59 AM
spyderg0d spyderg0d is offline
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Location: oneida, ny
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Mein Auto: 1995 325ic
Says not my last 3 beaters. Lol
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