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Author Topic: Cold sometimes inside, sensor problem?  (Read 216 times)

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Jan Suhr

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Cold sometimes inside, sensor problem?
« on: 18 November 2019, 14:25:22 »

In my winter Omega the heating is not working properly.

It sometimes heat up and stay warm, but most often it blows half cold air. If I raise the temp setting it blows warm air but then go back to cold after a while. If I turn it up to max I get hot air. Same thing if I turn up the fan to max it blows hot for a while.

It seems like it has problem to keep the temperature to the value I set.

Could it be the interior temp sensor?

Engine is running at approx 88°C and gets warm with in a few minutes, Thermostat is recently changed. Coolant level is OK.
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Jan Suhr
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Re: Cold sometimes inside, sensor problem?
« Reply #1 on: 18 November 2019, 15:53:17 »

Heater matrix air lock or blocked...

1. Cap off, engine on, heater set to Hi both sides, fan set to 1 bar. Run until fans kick in. Check and top up coolant. Repeat. Refit cap and call it done.

2. If 1. Doesn't work. Replace matrix.
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Jan Suhr

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Re: Cold sometimes inside, sensor problem?
« Reply #2 on: 18 November 2019, 16:57:37 »

Might be an air lock.

After I had changed the thermostat and driven it for a while the expansion tank was empty, topped it up and it is now at its proper level. Could have been an air lock then. I'll try your suggestion.


thanks


Jan
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Jan Suhr
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Re: Cold sometimes inside, sensor problem?
« Reply #3 on: 18 November 2019, 18:23:13 »

It's the only way to bleed it properly ;)
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Re: Cold sometimes inside, sensor problem?
« Reply #4 on: 18 November 2019, 21:54:07 »

I have had good results from reverse flushing the matrix. However I agree with Dr Gollum for best results change the matrix. Sounds like just airlocks, though you may be lucky.
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Jan Suhr

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Re: Cold sometimes inside, sensor problem?
« Reply #5 on: 19 November 2019, 16:49:54 »

It's the only way to bleed it properly ;)

Heat is on!

The method you  suggested seems to have done it. Drove a trip today, 250 km roundtrip, and it was warm and nice as it used to be.

Thanks  :y :y

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Re: Cold sometimes inside, sensor problem?
« Reply #6 on: 19 November 2019, 17:57:40 »

No problem :y

They can take some bleeding, but that method is the most effective way of getting it done. Check the level again in a day or so just to be certain there's no leaks anywhere ;)
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Re: Cold sometimes inside, sensor problem?
« Reply #7 on: 19 November 2019, 23:55:27 »

Good good. When the weather is nice again next summer I'd definitely recommend reverse flushing the matrix. As a rule once they're blocked, they've had it, really, as said above, and replacing them is a paint - even the easier method. ('proper' Opel method is to remove the whole dashboard!)

if you do flush it, and get some old rusty water out, then you've done some 'preventative maintenance' and possibly added  couple of years to the lifespan of the matrix, which can only be a good thing.  :y

When the weather is warmer!
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Jan Suhr

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Re: Cold sometimes inside, sensor problem?
« Reply #8 on: 20 November 2019, 22:01:14 »

I don't think I have any problem with the matrix. This car is only driven in the winter and before I took it out on October 1st I changed the thermostat since the engine temp took for ever to come up to normal. So apparently I didn't fill it up properly after the draining, I did also change the water pump, so I got an airlock. Last year i didn't have any problem with the heating  (when the engine eventual came up to temperature).

Now when the air lock is gone it gets up to temperature a lot quicker than before and it stays warm all the time. We have had above 5°C the last weeks, even up to 10°C some times which means that the AC kicks in when I lower the temp setting.

Everything work as it should and when puting the temp setting to HI it is hot as h*ll, almost burn the skin.


Thanks

Jan

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Jan Suhr
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Re: Cold sometimes inside, sensor problem?
« Reply #9 on: 21 November 2019, 00:24:35 »

That's fine.

I sometimes forget that most other Omegas work better than mine  :D ;D
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Jan Suhr

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Re: Cold sometimes inside, sensor problem?
« Reply #10 on: 21 November 2019, 07:28:15 »

That's fine.

I sometimes forget that most other Omegas work better than mine  :D ;D

 ;D ;D
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Jan Suhr
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