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Date:         Tue, 6 Oct 2009 09:30:39 -0400
Reply-To:     mcneely4@COX.NET
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dave Mcneely <mcneely4@COX.NET>
Subject:      Re: Coolant Temp Sensor Test. Generic vs VW.
Comments: To: neil N <musomuso@GMAIL.COM>
Content-Type: text/plain; charset=UTF-8; format=flowed; delsp=no

My mechanic put a Jetta temperature sensor on my camper with 2.1 engine. He said they were the same sensor. Dave Mc

On Mon, Oct 5, 2009 at 9:31 PM, neil N wrote:

> Hi all. > > Temp/resistance graphs in my Vanagon and Mk3 Jetta Bentleys appear to > be the same. Based upon that, it may be that the Mk3 Jetta and Vanagon > sensors have the same specs. If so.... > > My VanaJetta swap has had a long standing intermittent hard start > issue when engine warm. Wasn't really a problem. But twice finding > this engine error: "ECT - Intermittent Short to Ground", finally got > me off my butt to check things out. Since I have the sensor that c/w > engine (Possibly OEM? Has VW stamp. Made in Luxembourg), figured I'd > test and compare it to the suspect no name sensor. > > Heated each in water, 70F to boiling I see ~ 600 to 23 ohm difference. > (below) > > Ironically, since I chose to install a new one at time of swap, the > "VW" sensor seems within spec. The newer suspect one doesn't, but is > close. Since it was close..... > > Do the resistance value differences between the two sensors indicate > manufacturing differences (possibly quality control) or is the No Name > just a failing coolant temp sensor? > > Personally if the differences are due to lack of quality control, I'd > be tempted to spend the $ at the dealership if an OEM part can be had. > > Neil. > > Test pics: > > http://picasaweb.google.com/tubaneil/ECTTesting# > > Results: > > > On stove at "Med" to 80F, then "Max" to boil. At 212F for 1 min. > Converted to Celcius. Water stirred until boiling. Ignore the decimal > point! > > No Name VW > > 21C 2900 Ohms 2300 Ohms > 27 2440 1920 > 32 1940 1550 > 38 1656 1300 > 43 1360 1070 > 49 1130 890 > 54 932 750 > 60 780 640 > 66 666 530 > 71 555 450 > 77 470 380 > 82 400 325 > 88 337 278 > 93 286 240 > 100 217 194 > > > -- > Neil Nicholson '81 VanaJetta 2.0 "Jaco" > > http://tubaneil.googlepages.com/ > > > http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines


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