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Old 04-15-2018, 09:11 PM   #1
RobertGary1
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Default Evap temp sensor thermogrease

Like others I've been seeing an issue in which if you drive for several hours the evap eventually freezes up. I went to pick and pull to grab a couple of the temp sensors (since GM doesn't make them anylonger) and noticed that everyone came out dry. The FSM says that the cavity should be packed with the "thermogrease that comes with the sensor". I'm wondering if the sensor isn't reading correctly because the grease is eventually leaking out.
So what grease should I use? Di-electric? Or get CPU sink grease at a computer shop?

BTW: I just scanned mine. In the garage around 75F the BCM shows 1.2v from the sensor. WHen I turned on the A/C it jumped to around 1.9 and seemed to stay there.The FSM doesn't give much clue on how to map voltage to temp but does say that 2.45-2.55v equals 36-38F.

-Robert

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Old 04-17-2018, 01:58 AM   #2
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Default Re: Evap temp sensor thermogrease

I don't know if thermistors are the same and if one chart serves as a guide line. ons chart does show an inverse relationship between temperature and voltage. The same for temperature and resistance. The coolant sensor chart may be used here if it helps. What might skew things; different thermistor characteristics and incorrect chart.

With all things considered, baseline values should be kept in mind. Evaporator core temps should never go below approximately 35F otherwise hot and humid conditions at lower temps may freeze condensation, turning the hvac box into a block of ice. Can you confirm your evap coils are freezing? Besides the evap low temperature sensor feeding the control head to prevent continued compressor operation by removing power until evap temps rise above freezing, there's also a matter of loss of refrigerant that can contribute to freezing conditions. While its never been proven of faulty thermal expansion valves causing freezing conditions, other factors can cause freezing/low temperature problems. If you can, measure actual evap coil temps with another temperature sensor - infrared gun, hvac dial thermometer probe, meter and thermistor, whatever. Can your scanner display evap temps?

Everything is considered when lower than normal evap temps cause freezing problems; system contamination with excessive moisture, loss of refrigerant either from a leak or under charge after repair, compressor issues, contamination affecting txv operation and debris blocking liquid flow between condenser coil, filter/drier and orifice tube. Does your system use the orifice tube?

Solid state relays in some equipment use white thermal grease between the rear metal plate on the relays making contact to flat sheet metal to conduct heat away. I've replaced them over the years on drive motors using three phase power. After ten years or so, the grease dries out and becomes semi solid. Scraping it off then applying a glop of new grease makes renewing the heat sink compound some guarantee for long life. A small jar or tube lasts forever.

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Old 07-15-2018, 09:02 PM   #3
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Default Re: Evap temp sensor thermogrease

I also have an evaporator that is freezing up resulting in loss of cooling on longer highway runs. System was low but is now charged correctly. The compressor does not cycle leading me to the evap temp sensor which is not available. A trip to the pick and pull is upcoming. Any info on removal or thermal grease? Where are you scanning from?

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Old 07-24-2018, 10:13 AM   #4
RobertGary1
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Default Re: Evap temp sensor thermogrease

Quote:
Originally Posted by guyg View Post
Any info on removal or thermal grease? Where are you scanning from?
I'm scanning with GM's tech2win software. The new (j/y) sensor seems to be a big improvement. No freeze ups yet. I also noticed the resistance was different on my old sensor vs the two I got at pick n pull.
On the 2006 its easy to remove the sensor, it just screws into the side of the evaporator at the firewall. I believe later models it screws into the TXV.

-Robert

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Old 07-25-2018, 06:21 PM   #5
Bruce Rock
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Default Re: Evap temp sensor thermogrease

Quote:
Originally Posted by RobertGary1 View Post
I'm scanning with GM's tech2win software.
Interesting. What is needed to run GM's tech2win software (hardware and subscription)? Are there any sensors it does not report on?

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Old 07-25-2018, 08:09 PM   #6
Bruce Rock
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Default Re: Evap temp sensor thermogrease

I just read the "tec2 gamble" posted on the S series. I think that's about all I need to know.

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Old 07-30-2018, 11:49 AM   #7
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Default Re: Evap temp sensor thermogrease

Is anyone aware of a TSB related to the evap temperature sensor? Applying thermal grease allows better temperature transfer.

There is a TSB for the thermo switch installation on the 2005-2007 Vue. The switch sits in a well, and it is isolated from the refrigerant. It can be changed without discharging the system. The TSB relates to a condition where there was not enough thermal transfer grease placed in the well the sensor sits in. This condition keeps the switch from responding accurately. The fix is simple, pull the switch & add some heat sink grease.

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Old 08-11-2018, 09:58 AM   #8
Tim Rich, Sr
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Default Re: Evap temp sensor thermogrease

I have a somewhat similar situation. My A/C works very well, most of the time, Then it will stop working. I have found several things that seem to restore operation: sounds strange, maybe; on the freeway, flooring the accelerator for several seconds, and in town, shutting the ignition off and restarting.
What is the physical location of this switch, and can it be reached w/o disassembling parts. I just went out to my car and cannot locate the item.

This series of posts has been very informative for me.

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Old 08-11-2018, 02:13 PM   #9
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Default Re: Evap temp sensor thermogrease

Here's an interesting enquiry about evap temperature sensors used in Vues; https://autoacforum.com/viewtopic.php?p=6980#p6980. Below is a reprint from the service manual for replacing one. If drawings help, removing, cleaning off old thermal grease and applying fresh grease may help.
Attached Images
File Type: jpg Evap Temperature Sensor Replacement.jpg (160.1 KB, 11 views)

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Old 09-21-2018, 05:26 PM   #10
Tim Rich, Sr
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Default Re: Evap temp sensor thermogrease

Can anyone tell the resistance value range for the sensor. I understand the inverse relationship (called a neg temp coefficient) of thermistors, but would like to get a sense of the resistance range. Also, getting to the sensor on my '05 Vue v6 is a pain.

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