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Vent temp,Does it matter which vent i put the thermometer in

jezzer on Sat June 27, 2009 3:44 AM User is offline

Model: ZS
Country of Origin: United Kingdom

Hi

Ive been told the vent temperature should go down to 40f in my car but all im getting is 45f i know its not much different but i just want to make sure im doing the reading right,At the moment ive been putting the thermometer in the drivers side vent closer to the window,Sould it go in the centre vent?

daman on Sat June 27, 2009 10:59 AM User is offlineView users profile

All my FSM 's tell me to use center vent...

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'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

fonebone on Sat June 27, 2009 12:08 PM User is offline

Hi jezzer; Most vehicles have the evaporator centralized, or near center in the cowl, so putting the thermometer there gives you the lowest temp reading. Having to route the cooled air through the ducting picks up dash heat, so obviously the shorter the path from the evaporator to the nearest vent will be the coldest reading.

jezzer on Sat June 27, 2009 4:25 PM User is offline

Hi
Well im not to sure where the evaporator is in my ZS ill have to find out but im sure it cant be any different form other cars,I now see why they say the middle vent i never thought about the heat from the dash,So when would it be best to do a test would it be better to do it in the morning when the sun hasn't been out? Or would this give a false read as its allready cool outside and cool inside the car.

Karl Hofmann on Sat June 27, 2009 5:22 PM User is offlineView users profile

Jezza... Measure at the centre vent... Your evaporator is behind your glove box. It doesn't really mater what time of day you test in the UK but run the engine at about 1500rpm

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Never knock on deaths door... Ring the doorbell and run away, death really hates that!

jezzer on Sun June 28, 2009 6:48 AM User is offline

Cheers now i know where it is,So if its behind the glovebox wouldn't the airvent on the passengers side be the coldest? Just a thought?

Edit:

If i got a differrent reading doing it in the morning and in the day when its hot what would that say about the aircon,I know it cant be the gass because thats just been done,I still dont think its as cold as it should be.

Edited: Sun June 28, 2009 at 6:54 AM by jezzer

jezzer on Sun June 28, 2009 10:51 AM User is offline

Hi

Its not been a nice day dull and has rained a couple of times but its been very muggy,Because it has been a bit muggy i put the air-con on and tested the centre vent temp it got down to 42f wouldn't go any lower,if i had it in the side vent it wouldn't go below 45f.

I have found having the blower directed on the windscreen and feet feels very nice and the car seems to cool down,Having it on feet and face vents wasn't to good because i could hardly feel it on my feet unless i turned off my face vent on my side,But the best setting has got to be set to windscreen you can really feel the cold air comming at you and seemed to get the car cold alot faster.

Karl Hofmann on Sun June 28, 2009 4:01 PM User is offlineView users profile

Jezzer, although the evaporator is behind the glove box, it still has to run to te heater box which is located centrally so the centre vents will always be the shortest route for the air.... If the air flaps aren't travelling as they should then chances are the air is't going to where it should and some may even be passed through the heater matrix so unless the flap issue is sorted, then the aircon will never run to it's true potential..... The aircons on the older Rover 400 and 45... which were all the same car were alwys very good in my opinion because it was essentially a Honda system

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Never knock on deaths door... Ring the doorbell and run away, death really hates that!

jezzer on Sun June 28, 2009 6:30 PM User is offline

Cheers now that has made it easy to understand,I have sent a letter to vospers so we shall see what they will say i sent a letter on wednesday and got letter on friday saying the complaint has been logged and i should have a answer in 72Hours

Edited: Sun June 28, 2009 at 6:31 PM by jezzer

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