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Subject Topic: Thermal control amplifier (ac issue) (Topic Closed Topic Closed) Post ReplyPost New Topic
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purenole
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Posted: Sep 24 2008 at 8:44pm | IP Logged  

Just looking fo an answer to the same problem.  I knew it was a control issue as the pressures are right where they should be when the compressor runs.  just wont run when the engine compartment is hot.  it runs even on hotdays until you shut it off and restart after it sitting for a while.  I will try the solution and let you all know how it works out.

I had a similar problem with a chrysler product and the dealer wanted to replace the compressor.  I got a used part and did the work myself and still had the problem.  found a former dealer mechanic who diagnosed the problem in 30 seconds, The same dealer that suggested replacement had over 200 of the defective switches in stock!  Angry

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kam1
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Posted: Oct 02 2008 at 9:25pm | IP Logged  

is their not a obd code for this sensor?
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baykahz
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Posted: Oct 28 2008 at 2:22am | IP Logged  

I had a problem with my wifes xterra's A/C compressor clicking off and on then after  5 minutes or so A/C comes really cold. I thought it was low refrigerant so I took it in to an A/C shop and they found that my high pressure line was no good. so it was replaced & recharged. The next day my wife drove it same thing it starts clicking off & on. I then I started to do research online and found this forum page and read about THERMAL CONTROL AMP. I have since changed that $48.00 Part and now the A/C functions normal, Ice cold. So I thought since this forum helped me out. I wanted to give some visual help to others. With pictures of the (TCA) First I removed the 4 screws holding the glove box and the 2 holding the latch for the glove box door. Then I removed the 5 screws holding the housing together see pics.
There is also one screw on the back of the housing on the right side. Not shown.
Then you spread the two half's very carefully and then I inserted a small piece of wood to hold the two half's apart while you stick a long flat head screwdriver along the inside of the TCA and push it away from the core and it will pop right out. out.
This is what a new TCA looks like.
Then finally I put the new TCA between a new wooden chopstick that was not pulled apart and taped it to have some pressure on it so it will not come off easily. I then insert it to the same area it came out and with the long screw driver I push the TCA back into the core.


Now your ready to put the two half's and your glove box back together. Hope this help someone else out. And may you all have a GREAT DAY!


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lakota
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Posted: Oct 28 2008 at 2:20pm | IP Logged  

..

 ..

baykahz;

You are indeed a scholar and a gentleman! Welcome to the group.

Have a good one while you can still laugh about it.. Don S..

Obama’s plan to reduce income tax on the middle class and expanded health care is a farce! It is by increasing corporate taxes and expenses. The corporations simply pass these expenses and that tax straight back to us… the consumer, thank you, you will be paying for my problems!



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PLEASE >>> A SIG similar to mine can be VERY HELPFUL to all the members!
'99 4x4 3.3 Frontier Se KC Auto, 48,000 miles
'76 4x4 401 Wagoneer QT
'04 FWD 1.8 Sentra '08 FWD 2.4 Camry LE
Fort Worth
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jsanderson
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Posted: Nov 10 2008 at 12:31pm | IP Logged  

not as painful as I thought it was going to be. I took the bottom part out just to look it over and then put it all back in.

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www.fquick.com/jsanderson
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Anse
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Posted: Nov 30 2008 at 7:20pm | IP Logged  

The local dealer charged me $435 to replace that $40 sensor. I later removed the evaporator coil and found that they just pried open the box, cut the wires from the old sensor, dropped the remaining wires into the box, plugged in the new sensor and just dropped it into the box, not in the original location. Imagine my surprise at finding two sensors in the box and being charged that amount for a 20 minute job. Lost a customer permanently!

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pbody
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Posted: May 05 2009 at 9:54pm | IP Logged  

Me and my lovely girlfriend just gave the TCA replacement a go and it
went fairly easy with 4 hands, 2 large and 2 small.   

Once we got as many screws unfastened as we could, I held the box apart
while she slid in her left hand and easily slid the red sensor out of the
radiator-like wall. Then to get it back, same thing, no use of
screwdrivers or chopsticks, but that sure looks like a good backup plan.

After intermittent a/c issues and several misdiagnoses by dealers and
shops, my GF called her brother who lives across the country and within 5
seconds said to check the TCA sensor under the glovebox. He is a Dealer
Technicial Specialist Instructor. Why all dealer techs do not know about
this is beyond me.

We went to the internet for a little additional illustrative help and she now
has cool air to get her through the hot summer. So lucky to find forums
like these and people to share their stories.

Thanks all!
AP and LR
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Boatbuilder306
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Posted: May 06 2009 at 7:19am | IP Logged  

Update from the guy who ratted out Nissan for either not being aware of this well known, now highly documented problem, or for knowing about it and still charging customers $400+ to flush their customers' A/C systems and dawdle around for another 2 hours before putting a new little red TCA plug in: It's almost summer again here in NC, and as soon as the temperature outside got above 90, my less than 1 yr old "new" TCA started acting up again. I suspect that these sensors are made in China, and, well, crap. I have A/C on cooler days and there's no indication of the switch going on and off unexpectedly; but when it's REALLY hot outside (and inside the car) and you REALLY need that A/C, and the car is not running at highway speed (like when you're in a traffic jam or baking at a stop light), THEN the little bugger craps out. Anyone else having similar problems with their "new" $45 TCAs? My car was 6-7 years old before the first TCA failed, so if it's possible, the TCA part quality appears to have actually gotten worse! 

UPDATE: No need to panic! Just low on coolant...The "new" TCA is behaving just like it should and I have plenty of ice cold air.

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bizz716
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Posted: May 13 2009 at 7:27pm | IP Logged  

hey guys i also joined because of the great info you all have provided!! i also have this problem, just wondering one thing. when i charge it it lasts for 2-3 days then dies. sometimes its in and out. would this be a leak or the tca? also is this a dealer part? 

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cannabliss
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Posted: May 20 2009 at 5:56pm | IP Logged  

Boatbuilder306 wrote:
Update from the guy who ratted out Nissan for either not being aware of this well known, now highly documented problem, or for knowing about it and still charging customers $400+ to flush their customers' A/C systems and dawdle around for another 2 hours before putting a new little red TCA plug in: It's almost summer again here in NC, and as soon as the temperature outside got above 90, my less than 1 yr old "new" TCA started acting up again. I suspect that these sensors are made in China, and, well, crap. I have A/C on cooler days and there's no indication of the switch going on and off unexpectedly; but when it's REALLY hot outside (and inside the car) and you REALLY need that A/C, and the car is not running at highway speed (like when you're in a traffic jam or baking at a stop light), THEN the little bugger craps out. Anyone else having similar problems with their "new" $45 TCAs? My car was 6-7 years old before the first TCA failed, so if it's possible, the TCA part quality appears to have actually gotten worse! 


Sorry to hear that Boatbuilder.  I actually just registered to THANK YOU for the great info.  I was having problems with my a/c for over a year.  No one could figure it out; spent at least $300 on the damn thing.  Forty dollars and one hour's worth of elbow grease later and I've got cold air blowing again!  Apparently it's even fixed the overheating problems I was having.  THANKS AGAIN for the help bud, hope you get this new problem resolved fairly easy.
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