Heater Booster Above 10c?

[g4hlf]

Hi all,

 

I mentioned sometime back my heater booster was unreliable on my 2002 Ford Galaxey 1.9TDI Ghia.

 

I eventually got the heater booster and the metering pump replaced under warranty and now there is no problem with the unit firing up.

 

What concerns me now is it always seems to fire up and I cannot remember if this is normal? I appreciate the external air temp sensor is under the wipers somwhere and is not related to the temp indicated on the instrument cluster or air con unit but I hear the booster heater fire up when these sensors indicate 15c!

 

My understanding is that the water should be below 77c AND the external air temp should be below 10c

 

Not had a really hot day yet do verify over 15c.

 

Are there more then one type of booster unit and could they have fitted the older type?

 

Regards,

 

Paul

[g4hlf]

any ideas anyone? Edited May 2, 2006 by Masked Marauder

[johnb80]

Mine usually starts up at less than 11.5 deg C so maybe yours is the same.

 

Regards - JB

[NikpV]

Coincidence or what - Started mine today temp 11c and lo and behold - taxing aircraft noise under passenger wheelarch :blink:

[chromedome]

Same here, the temperature sensors are probably very low tech with a high degree of tolerance either way.

[Masked Marauder]

This is the first time I have seen anyone complain about the heater starting up.....

 

Anyone would think diesel was over

[NikpV]

This is the first time I have seen anyone complain about the heater starting up.....

 

Anyone would think diesel was over

[g4hlf]

This is the first time I have seen anyone complain about the heater starting up.....

 

Anyone would think diesel was over

[Guest 3.5bullet]

[

 

Can anyone tell me where the C311 connector is located please?

 

Regards,

 

Paul

 

from looking at the wiring diagrams it's the larger of the two plugs on the heater unit under the car, 8 pin plug?

[NikpV]

may be a silly question but have you tried disconnecting a wire from the temp switch on the wiper arm to check if its that??

[sanjsanj]

may be a silly question but have you tried disconnecting a wire from the temp switch on the wiper arm to check if its that??

 

Could you please take a picture of where the sensor is located please? I couldn't find anything obvious when i looked.

 

Also, as someone has already mentioned, R.T.F.M :D it states that the aux heater switches on when the temperature is below 5 C "*or the coolant temperture is below 75 C*"

 

"*not entirely sure about the coolant temperture (75) and whether its an or or an and

[g4hlf]

may be a silly question but have you tried disconnecting a wire from the temp switch on the wiper arm to check if its that??

 

Also, as someone has already mentioned, R.T.F.M :D it states that the aux heater switches on when the temperature is below 5 C "*or the coolant temperture is below 75 C*"

 

"*not entirely sure about the coolant temperture (75) and whether its an or or an and

 

10C in my manual and on the Ford technical document I was sent ! In any case my problem is the heater booster is ALWAYS on until the water temp is reached. the external air temp can be 5C, 10C 25C... it will happily come on regardless :-)

 

The suggestion regarding the wire for the temp switch on the wiper arm is what I want to do but I would really appreciate how to locate it. My Galaxy is a Feb 2002 model.

 

Regards,

 

Paul

[Masked Marauder]

It is inside the bonnet clipped to the passenger side of the wiper linkage

 

http://www.bigtrucker.co.uk/images/heaterswitch.jpg

 

A common trick in the winter is to unplug it and put a 10A mini-fuse into the connector, you can see that to the right of the picture. So if we assume they have done something like this to make sure it works after they fixed it, and then forgot to undo it, then that may be the problem.

[sanjsanj]

It is inside the bonnet clipped to the passenger side of the wiper linkage

 

http://www.bigtrucker.co.uk/images/heaterswitch.jpg

 

A common trick in the winter is to unplug it and put a 10A mini-fuse into the connector, you can see that to the right of the picture. So if we assume they have done something like this to make sure it works after they fixed it, and then forgot to undo it, then that may be the problem.

 

urm, MM, the thing you've circled looks like a bolt screwed though the air intake? is that an air intake? is that a bolt?

[Masked Marauder]

No that is the temperature switch clipped to the wiper linkange and it is in front of the pollen filter.

[sanjsanj]

the attached thumbnail says that the heater should come on below 5C or until 75C has been reached by thw water coolant.

 

now i've only had this car for 3 weeks, so i'm asking you guys: does this mean that it wont work in the winter as well?

 

if it should work and i decide to fix it, will it be beneficial (and by this i mean the main point being the bank account! :D ) to do so at this time of year(hot weather)?

[Masked Marauder]

The benefit is that the engine and heating will warm up quicker. Other than that there is not much benefit. It is purely a comfort item.

 

And the manual is wrong, it only comes on if both the conditions are true, temperature below 5 degrees (later models are 10 degrees) and coolant below 75 degrees.

[sanjsanj]

The benefit is that the engine and heating will warm up quicker. Other than that there is not much benefit. It is purely a comfort item.

 

And the manual is wrong, it only comes on if both the conditions are true, temperature below 5 degrees (later models are 10 degrees) and coolant below 75 degrees.

 

right now it makes sense!

in the winter, would you recommend it be on or off?

 

and how can i change to 10 degrees?

[Masked Marauder]

In the winter it is worth making sure it works, I would not bother at the moment though.

 

The best way to make it work is to take the connector of the back of the switch and put a mini fuse in it's place. It will always come on then if the coolant is below 75 degrees and the engine is running.

 

EDIT: Does the later model have the switch on the wiper linkage, I can't see it on the parts catalogue!

[sanjsanj]

In the winter it is worth making sure it works, I would not bother at the moment though.

 

The best way to make it work is to take the connector of the back of the switch and put a mini fuse in it's place. It will always come on then if the coolant is below 75 degrees and the engine is running.

 

You can change to 10 degrees by changing the under bonnet switch.

 

which connector are you talking about? where can i get a minifuse? whats the difference between a fuse and a minifuse?

[NikpV]

whats the difference between a fuse and a minifuse?

 

:blink: :blink:

 

size???

 

try a google search

[g4hlf]

Hi all,

 

After another visit to the garage today they have removed the ambient air temperature sensor and claim the booster heater does not come on anymore! I will be able to confirm this tomorrow morning.

 

They also told me they placed the temp sensor in a fridge, let it get cold then stuck a meter across the contacts and claim when cold it is open circuit and when warm closed circuit. This is arse about tit as far as I can see from the wiring diagram.

 

This then raises the question did they replace the temperature sensor with the correct component, they first changed it in Jan 2006, later they replaced the complete booster heater and then changed the ambient temp sensor again a month ago so ago.

 

The part number on this item is as follows.... it is a VW part no 1J0 959 625

 

Just to refresh memories my original problem was the booster heater often failed to come on in the winter even when external temp was -4 etc. After finally replacing the complete booster heater assembly and the metering pump it comes on all the time (until water temp reaches 75c) even in the recent 37c heat.

 

Could there be two types of temp sensor, one which is NO and one NC?

 

My Galaxy Ghia was manufactured in Nov 2001, around the time of some subtle changes?

 

Regards,

 

Paul

[g4hlf]

Any ideas anyone?

 

 

 

 

Hi all,

 

After another visit to the garage today they have removed the ambient air temperature sensor and claim the booster heater does not come on anymore! I will be able to confirm this tomorrow morning.

 

They also told me they placed the temp sensor in a fridge, let it get cold then stuck a meter across the contacts and claim when cold it is open circuit and when warm closed circuit. This is arse about tit as far as I can see from the wiring diagram.

 

This then raises the question did they replace the temperature sensor with the correct component, they first changed it in Jan 2006, later they replaced the complete booster heater and then changed the ambient temp sensor again a month ago so ago.

 

The part number on this item is as follows.... it is a VW part no 1J0 959 625

 

Just to refresh memories my original problem was the booster heater often failed to come on in the winter even when external temp was -4 etc. After finally replacing the complete booster heater assembly and the metering pump it comes on all the time (until water temp reaches 75c) even in the recent 37c heat.

 

Could there be two types of temp sensor, one which is NO and one NC?

 

My Galaxy Ghia was manufactured in Nov 2001, around the time of some subtle changes?

 

Regards,

 

Paul

[sanjsanj]

I would like to disconnect the temp sensor.....can i do this by pulling out some wires from the aux heater itself (its getting colder and thought it would be a good idea to see if it works before the winter months)

[gazza007]

I would like to disconnect the temp sensor.....can i do this by pulling out some wires from the aux heater itself (its getting colder and thought it would be a good idea to see if it works before the winter months)

 

The best way to make it work is to take the connector of the back of the switch and put a mini fuse in it's place. It will always come on then if the coolant is below 75 degrees and the engine is running.