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Discussion Starter · #1 ·
I hope I'm not talking about something thats already been covered. I
have a 1994 Tarago, an Australian version. The heater blows warm air
from all vents when the temp is set to cool. I think the vent temp
should be the same as the outside temp but it's at least 15 to 20
degrees warmer. On a cold day this isnt too much of a problem but on a
warm day when all you want is some ventillation from outside, it's
like having the heater on and I have to use the air con to compensate.
The Aircon works fine though, even on the hottest day.
The Toyota dealer says that because the air intake is at the rear of
the bonnet right over the engine, the air is heating up in the intake.
If this was the case I should be able to rectify it by using the
recycle feature and get air from inside the car but it's still warm so
I dont think its being heated up by the intake pipe. Has anyone seen
or heard of this before?. Thanks in advance.
 
G

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Discussion Starter · #2 ·
On Wed, 31 Jan 2007 09:53:26 +0000, BumHead wrote:

> I hope I'm not talking about something thats already been covered. I have
> a 1994 Tarago, an Australian version. The heater blows warm air from all
> vents when the temp is set to cool. I think the vent temp should be the
> same as the outside temp but it's at least 15 to 20 degrees warmer. On a
> cold day this isnt too much of a problem but on a warm day when all you
> want is some ventillation from outside, it's like having the heater on and
> I have to use the air con to compensate. The Aircon works fine though,
> even on the hottest day. The Toyota dealer says that because the air
> intake is at the rear of the bonnet right over the engine, the air is
> heating up in the intake. If this was the case I should be able to rectify
> it by using the recycle feature and get air from inside the car but it's
> still warm so I dont think its being heated up by the intake pipe. Has
> anyone seen or heard of this before?. Thanks in advance.



Ah..a Previa... ;)

I would look under the hood, and be looking for a valve that is connected
to a hose going into the firewall. There are a few former Previa owners
here, maybe they can help more, since I don't really know if this valve is
controlled by a cable or by vacuum. I would be looking for a valve
attached to a heater hose going into the firewall, and make sure the vavle
moves when the temp control is moved.

Sorry, just generic troubleshooting, but I believe this is the cause of
your problem!

If you don't get any further responses, repost with the name 'Previa' in
the title!

Good luck!
 
G

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Discussion Starter · #3 ·
On Wed, 31 Jan 2007 13:58:51 +0000, BumHead wrote:

> Thanks for the suggestion I'll check it out, but it's my understanding
> that there isnt a water control valve as such, the temp is controlled by a
> flap that seperates the hot side from the cold side, if that makes sense.
> All the heater flaps are working ok and without actually pulling the dash
> out to physicaly check if one is leaking, it's hard to pinpoint the prob,
> but I'll have a look at what youve suggested. Thanks


Hmmm...usually, these are located behind the glove box. Try removing the
glove box and see if you can discern what's going on back there!



>
> On Wed, 31 Jan 2007 13:39:15 GMT, Hachiroku ???? <[email protected]> wrote:
>
>>On Wed, 31 Jan 2007 09:53:26 +0000, BumHead wrote:
>>
>>> I hope I'm not talking about something thats already been covered. I
>>> have a 1994 Tarago, an Australian version. The heater blows warm air
>>> from all vents when the temp is set to cool. I think the vent temp
>>> should be the same as the outside temp but it's at least 15 to 20
>>> degrees warmer. On a cold day this isnt too much of a problem but on a
>>> warm day when all you want is some ventillation from outside, it's like
>>> having the heater on and I have to use the air con to compensate. The
>>> Aircon works fine though, even on the hottest day. The Toyota dealer
>>> says that because the air intake is at the rear of the bonnet right
>>> over the engine, the air is heating up in the intake. If this was the
>>> case I should be able to rectify it by using the recycle feature and
>>> get air from inside the car but it's still warm so I dont think its
>>> being heated up by the intake pipe. Has anyone seen or heard of this
>>> before?. Thanks in advance.

>>
>>
>>Ah..a Previa... ;)
>>
>>I would look under the hood, and be looking for a valve that is connected
>>to a hose going into the firewall. There are a few former Previa owners
>>here, maybe they can help more, since I don't really know if this valve
>>is controlled by a cable or by vacuum. I would be looking for a valve
>>attached to a heater hose going into the firewall, and make sure the
>>vavle moves when the temp control is moved.
>>
>>Sorry, just generic troubleshooting, but I believe this is the cause of
>>your problem!
>>
>>If you don't get any further responses, repost with the name 'Previa' in
>>the title!
>>
>>Good luck!
 
G

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Discussion Starter · #4 ·
"BumHead" <[email protected]> wrote in message
news:[email protected]
> Thanks for the suggestion I'll check it out, but it's my understanding
> that there isnt a water control valve as such, the temp is controlled
> by a flap that seperates the hot side from the cold side, if that
> makes sense. All the heater flaps are working ok and without actually
> pulling the dash out to physicaly check if one is leaking, it's hard
> to pinpoint the prob, but I'll have a look at what youve suggested.
> Thanks
>


There is a heater control valve somewhere that controls the amount of hot
colant going to the heater core. I never looked for it in a Tarago/Previa
but it is probably on the firewall in front of the passenger compartment.

Make sure the lever on the heater control valve moves when the temperature
control lever is moved inside.


--

Ray O
(correct punctuation to reply)
 
G

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Discussion Starter · #5 ·
I think I stuffed up, I said it was a 94 but it's actually a 2004. In
any case it sounds like there isnt any common faults in that model
that I can find. I'm currently looking for a schematic diagram of the
heater so i can see what each of the flaps do, but at this stage I'm
at a standstill with it.
Thanks for your help.



On Wed, 31 Jan 2007 09:53:26 GMT, BumHead <[email protected]> wrote:

>I hope I'm not talking about something thats already been covered. I
>have a 1994 Tarago, an Australian version. The heater blows warm air
>from all vents when the temp is set to cool. I think the vent temp
>should be the same as the outside temp but it's at least 15 to 20
>degrees warmer. On a cold day this isnt too much of a problem but on a
>warm day when all you want is some ventillation from outside, it's
>like having the heater on and I have to use the air con to compensate.
>The Aircon works fine though, even on the hottest day.
>The Toyota dealer says that because the air intake is at the rear of
>the bonnet right over the engine, the air is heating up in the intake.
>If this was the case I should be able to rectify it by using the
>recycle feature and get air from inside the car but it's still warm so
>I dont think its being heated up by the intake pipe. Has anyone seen
>or heard of this before?. Thanks in advance.
 
G

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Discussion Starter · #6 ·
On Thu, 01 Feb 2007 14:00:36 +0000, BumHead wrote:

> I think I stuffed up, I said it was a 94 but it's actually a 2004. In any
> case it sounds like there isnt any common faults in that model that I can
> find. I'm currently looking for a schematic diagram of the heater so i can
> see what each of the flaps do, but at this stage I'm at a standstill with
> it.
> Thanks for your help.


LOL! Yeah, a bit of a difference there! In that case, you are correct in
that the heating is controlled by flaps! But, there may be a valve still.
At least on a Caravan (Dodge..NOT a 'camper'!!) I had there was still a
vavle that would close when the lever was moved fully to Cold.



>
>
>
> On Wed, 31 Jan 2007 09:53:26 GMT, BumHead <[email protected]> wrote:
>
>>I hope I'm not talking about something thats already been covered. I have
>>a 1994 Tarago, an Australian version. The heater blows warm air from all
>>vents when the temp is set to cool. I think the vent temp should be the
>>same as the outside temp but it's at least 15 to 20 degrees warmer. On a
>>cold day this isnt too much of a problem but on a warm day when all you
>>want is some ventillation from outside, it's like having the heater on
>>and I have to use the air con to compensate. The Aircon works fine
>>though, even on the hottest day. The Toyota dealer says that because the
>>air intake is at the rear of the bonnet right over the engine, the air is
>>heating up in the intake. If this was the case I should be able to
>>rectify it by using the recycle feature and get air from inside the car
>>but it's still warm so I dont think its being heated up by the intake
>>pipe. Has anyone seen or heard of this before?. Thanks in advance.
 
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