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Dash a/c [message #323677]

Sat, 09 September 2017 21:05

Wayne

Messages: 106
Registered: August 2004

Karma: 0

Senior Member

Type 2 a/c on 76 Birchaven.

Temperature switch in the front a/c box. Is the capillary tube supposed to touch the evaporator fins?

http://www.gmcmhphotos.com/photos/data/7085/medium/IMG_20170909_172629.jpg

http://www.gmcmhphotos.com/photos/data/7085/medium/IMG_20170909_172617.jpg

Wayne Lawrence
76 Birchaven
Bellflower CA
w.lawrence@verizon.net

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Re: Dash a/c [message #323687 is a reply to message #323677]

Sun, 10 September 2017 07:12

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

Wayne wrote on Sat, 09 September 2017 22:05

Type 2 a/c on 76 Birchaven.
Temperature switch in the front a/c box. Is the capillary tube supposed to touch the evaporator fins?
<pictures snipped>

Wayne,

In other systems, that temperature control is supposed to prevent evaporator freeze-up. If that is the case here, it needs to be really close but touching should not matter.
Maybe someone else knows the GMC system better than I do.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: [GMCnet] Dash a/c [message #323690 is a reply to message #323687]

Sun, 10 September 2017 07:48

emerystora

Messages: 4442
Registered: January 2004

Karma: 13

Senior Member

It doesn't matter about the tube touching but the bulb at the end of the tube should never touch. There is usually a clip of some kind to keep the bulb away, but close, to the fins. It is supposed to measure the air temperature not the fin temperature.

Emery Stora

> On Sep 10, 2017, at 7:12 AM, Matt Colie wrote:
>
> Wayne wrote on Sat, 09 September 2017 22:05
>> Type 2 a/c on 76 Birchaven.
>> Temperature switch in the front a/c box. Is the capillary tube supposed to touch the evaporator fins?
>>
>
> Wayne,
>
> In other systems, that temperature control is supposed to prevent evaporator freeze-up. If that is the case here, it needs to be really close but
> touching should not matter.
> Maybe someone else knows the GMC system better than I do.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> GMCnet mailing list
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