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Bottom radiator hose cold


YogiTheBear

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Hey guys.

 

Recently refitted my B4 with a closed deck block after its factory one died. 

Replaced everything wear and tear in the process including new water pump and thermostat.

Have road tested it twice so far, once around town for about 30 mins and once on the motorway about 25 mins to work.

On the road test around town the bottom radiator hose warmed up somewhat, not as much as the top hose.

On the road test on the motorway to work this morning the bottom hose remained pretty much cold.

During both tests the temp gauge stayed stable at temp.

Is this normal or could there be an underlying problem that is going to lead to a cooked block?

The bleeding procedure I used was jacking the car right up at the front and filling it through the top radiator hose, Refit Radiator hose and fill through main radiator cap, burbed the top hose until no more air bubbles came out, started the car and burbed/bled it further until again no air bubbles came out.

 

Thanks in advance.

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On the motorway there is a lot of air going through the radiator and the thermostat might be mostly closed... I've had a temp gauge on my top and bottom hoses at the same time, and the temperature drop through the radiator on the motorway is surprising... 90 degrees down to 15 at the bottom sometimes.

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3 hours ago, YogiTheBear said:

I haven't checked the heater hoses specifically but the heater is blowing hot air which would mean they are right?

Does it blow hot consistently? If you try bleeding again, just check that the heater hoses are getting hot as well during the process. i had that issue once in getting rid of an airlock

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8 hours ago, blitzd808 said:

Does it blow hot consistently? If you try bleeding again, just check that the heater hoses are getting hot as well during the process. i had that issue once in getting rid of an airlock

Yea it blows nice and hot constantly. Just saw 3 air bubbles escape via the coolant reservoir when I got home and checked it. Hope that is just trapped its finding its way out and not the start of something more sinister?

The thermostat is definitely opening though as I went through some more urban streets before getting home and the bottom hose did warm up.

10 hours ago, Loren said:

On the motorway there is a lot of air going through the radiator and the thermostat might be mostly closed... I've had a temp gauge on my top and bottom hoses at the same time, and the temperature drop through the radiator on the motorway is surprising... 90 degrees down to 15 at the bottom sometimes.

My original thoughts were that might be the case. I took a more urban route home and bottom hose warmed up. I saw 3 bubbles escaping through the coolant reservoir though when I checked it so hoping that is just trapped air leaving and not air finding a way in elsewhere...

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