Heater not working

**p8ence** · 19-04-2011, 07:00 AM

Hi Guys,

I put another heater/fan switch into my VS but the heater is not working, I am only getting cold air out and it only comes at the feet. Even I change from face to demist still only comes at the feet... I switch on the air con and the light comes on, no change in the revs/taco and the same temp air comes out. There is also a distictive hissing noise when the unit is turned off... not sure, can anyone help me on this?

Thanks
Daz

**justbad4you** · 19-04-2011, 07:13 AM

did you have hot air b4 you did the change>>>>the hissing sounds like vacum

Originally Posted by p8ence

Hi Guys,

I put another heater/fan switch into my VS but the heater is not working, I am only getting cold air out and it only comes at the feet. Even I change from face to demist still only comes at the feet... I switch on the air con and the light comes on, no change in the revs/taco and the same temp air comes out. There is also a distictive hissing noise when the unit is turned off... not sure, can anyone help me on this?

Thanks
Daz

**p8ence** · 19-04-2011, 07:24 AM

no mate, that is why I changed it, also the fan don't turn on till number 3 and it turns on blowing at the strenght with number 3, old and new this happened... No for old and new no hot air, fan did not turn on till number 3, did not change direction from face to demist...

Thanks
Daz

**justbad4you** · 19-04-2011, 07:37 AM

Sounds like your fan amplifier could be stuffed. The fan amplifier is like the resistor in the models without climate control, and is located in the same place. I had mine replaced last year, was about $140 for the part. as for the heat side im not sure...have you just brought the car?

**p8ence** · 19-04-2011, 08:03 AM

yes I just got the car 3 weeks ago... so where is this fan amplifier located??

Thanks

**magnetvh** · 19-04-2011, 08:56 AM

Your heater and air con control panel is vacuum operated. There is about 5 vacuum hoses behind it and if any come off it makes a hissing sound. Neva heard of a fan amplifier but if the other bloke has changed 1 b4 he must know wot he's talking about. Also ur heater tap might b ###d. It's located under bonnet with heater hose going to and from it. I'm pretty sure they too have 1 of 2 vacuum hoses goin too it aswell. Very easy to fix heater tap. They cost about $40 to $50.

**p8ence** · 19-04-2011, 09:27 AM

Thanks for that, I will look at the hoses... all new education for me

I found the resistor and pulled it out, seems to look ok, all the springs are attached and no signs of breakage there...

**justbad4you** · 19-04-2011, 12:05 PM

ok this may sound silly? check under the hood and see if the heater has been disconected b4 you got it....it may have the a buggered heater core and who sold the car to you closed off hoses in the engine bay to stop coolent leaking into the cab via the stuffed heater core,,,,,,i had a mate who brought a car with the sam prob as you state. althogh his fan worked on all speeds also so explians why you dont get cooler air when aircon is on as heeat and cool come go thru the heater core,so i got a feeling from what you say that you heater has been cut off from under the bonnet,,,if so you will have to replace the core and reconect the heater hoses under the hood

Originally Posted by p8ence

yes I just got the car 3 weeks ago... so where is this fan amplifier located??

Thanks

**hako** · 19-04-2011, 09:30 PM

Definitely a vacuum problem....follow the vacuum line from the back of the inlet manifold to the vacuum ball and then thru the firewall and where it connects to multiple places....just a matter of elimination. This may take time but it is the only way. You don't have an amplifier - they are on climate control models. see attached pix for heater tap.