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Discussion Starter · #1 ·
Hello folks,

The wife has a W reg Astra (1.6) and the heater does not work.

When it is turned on it blows cold air but does not heat up.

From Google I have discovered the common issues are - no coolant, and a broken resistor pack.

Could someone point me in the direction of the coolent tank under the bonnet? Also does anyone know where the resitor pack is on a W reg? I have read they can be in two different places?

Any other suggestions would be great, getting colder in the mornings!
 

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A.O.N - Approved Vauxhall Specialist (Anthony)
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Does the blower work on all speeds? If it does, then it is not a problem with the resistor. A blown resistor would only allow the fan to work on speed 4. This wouldn't affect whether hot air comes out or not.

The coolant reservoir is at the rear of the engine compartment, behind the battery.

Can you hear the airflow change as you move the heat control from cold to hot?

Does the engine actually get hot (temperature gauge raises to the center of its travel within 2 to 3 miles)?
 

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There was an electric valve in the heater circuit that used to fail on these, could be your answer. It was problematic enough for them to do away with them - all you get now is an 'H' shaped bit of pipe to remove the valve.
 

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Discussion Starter · #5 ·
Ok guys,

Last night I had a play, the coolant was empty nigh on so I filled it but nothing changed, I took the glovebox out to get at the pollen filter and it was pretty clean. Gave it a tap out but generally ok.

This is what I have noticed -

The coolant bottle gets hot so water is heating for the heater.
The airflow does not get hot
The pollen filter is clean
Switches work on all 4 setting and there is an audible change when I turn on the heat (When I had the filter out I ran the engine and heater and it didnt warm directly at the fan.

So I am guessing it is the little electrical part (thermostat?) under the bonnet not letting water get to the radiator?

Any tips on changing this?
 

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A.O.N - Approved Vauxhall Specialist (Anthony)
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As Stickman mentions, some models have a solenoid valve behind the heater matrix which controls the flow of coolant through the matrix - stopping it when the temperature control is set to fully cold.

I have changed a heater matrix on one of these in the past, and it is a swine to get to anything in that area, let alone change it.

Does the car have air conditioning? If it doesn't, then I don't think you will have this valve. Have you checked all of the fuses, just in case one is blown and not allowing the valve to open?

Another option is that the coolant was so low that it caused an air lock in the heater matrix when you topped it back up. Give all of the rubber hoses a squeeze to force coolant through the system and flush out any air bubbles.
 

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A.O.N - Approved Vauxhall Specialist (Anthony)
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Hi mate,

It is air-con. I will try the hoses tonight.

Failing that is must be this solenoid then?
Not necessarily - could be heater controls, power supply problem, wiring fault etc.

As I mentioned before, any thought of taking out the solenoid should be a last resort!

Do the hoses leading to the heater through the bulkhead get hot?

Can you feel the heater box in the area of the heater matrix get hot (in the base near the clutch pedal)?
 

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Discussion Starter · #10 ·
Hey folks,

I finally found out that the problem is the heater matrix, I have bought a new one and had most of the centre console out but cant work out how to get to the thing.

Has anyone made a how to guide?
 

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A.O.N - Approved Vauxhall Specialist (Anthony)
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Hey folks,

I finally found out that the problem is the heater matrix, I have bought a new one and had most of the centre console out but cant work out how to get to the thing.

Has anyone made a how to guide?
Not that I have ever seen.

The matrix is in the bottom of the heater box, just above the gearshift shaft that disappears through the firewall.
 
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