Evaporator Temperature Sensor

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Sep 12, 2009 | 02:06 PM

lane_a

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From: Houston, Texas 77095

Evaporator Temperature Sensor

I installed a Griffiths serpentine evaporator about 2 years ago in my ‘96 993. Since that time I’ve had a problem with the evaporator freezing up which, with the help of this forum, have traced to bad evaporator temperature sensor. I am now in the process of replacing the sensor and have pulled out the old one and see that I had put a bend in it for the serpentine evaporator installation. I vaguely remember this was in the installation instructions.

It's obvious to me that I broke the temp sensor when I did this bend 2 years ago and I don’t want to do the same thing again. So, my question is there a safe way of putting this bend in the sensor element without endangering the sensor itself? Obviously and in hindsight the element will need a nice smooth bend with no buckles.

If anyone has any suggestions here, it would be greatly appreciated.

Sep 12, 2009 | 05:27 PM

TMc993

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From: Dahlonega, Georgia

I'm assuming the sensor element is the copper tube type? If so I've had success bending those by wrapping the element around a cylindrical shaped object like a wooden dowel, screwdriver handle, piece of stout hydraulic hose, etc....The key is taking the time to accomplish gradual shaping and avoid kinking the element....If the bend required is a 90 degree bend, that will be pretty difficult to accomplish without kinking the element.

Sep 12, 2009 | 06:22 PM

lane_a

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From: Houston, Texas 77095

The material could be a plated copper tube. Anyway, thanks much for the advise, I'll try this.

Thanks again.

Sep 12, 2009 | 06:49 PM

axl911

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From: Dallas, TX

How do you remove the evap temp sensor? I recalled an article somewhere with pics on how to do this, but I can't find it.

--anthony

Sep 13, 2009 | 11:44 AM

lane_a

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From: Houston, Texas 77095

Here is the very helpful DIY that was previously posted on the forum. You'll find it a few pages inside the document.

http://ozarkpca.org/docs/injectors/2009_03.pdf

Sorry, it's not showing up as a hyperlink, so you'll have to copy and paste in your web browser.

Sep 13, 2009 | 03:15 PM

axl911

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From: Dallas, TX

Lane,

That's the exact article I am looking for. Thanks!!!

Sep 14, 2009 | 02:44 PM

trojanman

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From: Orange County, So Cal

When I installed my Kuehl evaporator recently, I was a little concerned about the fit of the temp probe as well. Even with the prescribed bend, I could not get the probe to insert all the way flush with the airbox. I used a mirror and flashlight to see where the probe was entering the evap fins, but still hit resistence before the base was flush.

After several tries, I just used the sticky sealant that came with the core and sealed the airbox hole as best I could.

Here's hoping the probe's in the right place and I don't have freeze-up problems in the future!