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Top Radiator Hose is HARD and HEATER is Blowing Cold Air

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BUELLRIDER
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Top Radiator Hose is HARD and HEATER is Blowing Cold Air

Post by BUELLRIDER » Thu Nov 28, 2019 4:45 pm

I dont get it the Heater is Blowing Cold Air when on HOT and on High and I noticed the top Radiator Hose gets Hard when the motor is Hot.
1981 635 German FRANKEN6ER gray market RIG, 1988 635,91 Nissan 240SX , 1993 Harley 1340ccFXR Super Glide, 2000 M2 Buell 1200cc.

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86_6series
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Re: Top Radiator Hose is HARD and HEATER is Blowing Cold Air

Post by 86_6series » Fri Nov 29, 2019 1:19 pm

Make sure your heater valve is working, opening to let hot water into heater core.

#1

https://www.realoem.com/bmw/enUS/showpa ... Id=64_0091

When the engine warms up and the thermostat opens to let hot water to the radiator the hose will feel hard

because it's under presser.

Pod
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Re: Top Radiator Hose is HARD and HEATER is Blowing Cold Air

Post by Pod » Mon Dec 02, 2019 12:16 am

If the valve is working, then you must have a blockage either in the heater matrix or one of the hoses.

85MSteinway
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Re: Top Radiator Hose is HARD and HEATER is Blowing Cold Air

Post by 85MSteinway » Tue Dec 03, 2019 3:24 pm

I've recently dealt with similar symptoms, mine were intermittent though. Heater valve failed. there is a rebuild for about 15 dollars on one of the parts stores. Pelican maybe? beats the 300 dollars asked for the whole valve. easy rebuild too.
L6
85 M635

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86_6series
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Re: Top Radiator Hose is HARD and HEATER is Blowing Cold Air

Post by 86_6series » Tue Dec 03, 2019 6:12 pm

I've owned my 6 for almost 32 years. I tried repair kits twice with little longevity.
Since I knew I would never sell it, and sometimes I would drive it in the dead of winter,
I went with the OEM part way back when and never looked back.

Just saying that be prepared if the repair kit doesn't last that long.

Bob V

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Re: Top Radiator Hose is HARD and HEATER is Blowing Cold Air

Post by BUELLRIDER » Wed Dec 04, 2019 2:05 am

Is there a Fuse to it. Maybe I can bypass it.Is there a RELAY to it????
1981 635 German FRANKEN6ER gray market RIG, 1988 635,91 Nissan 240SX , 1993 Harley 1340ccFXR Super Glide, 2000 M2 Buell 1200cc.

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