No A/C !!!! - Land Rovers Only

never be over rover · 04-23-2007, 01:08 PM

My A/C hasn't worked since i bought my 96 RR 4.0 last fall. Now that it's spring i wanted to get it ready for the summer.

I checked the r-134a level and the system is charged. When I power the condensor directly it starts up and i get cold air. I didn't want to jerry rig a switch, and i don't fully understand the LR A/C system?

A couple portions of my climate control display dont work should i be looking at that, or is there some computer i should be hunting down.

Any digrams or suggestions of diagnostic procedure would help greatly.

never be over rover · 04-24-2007, 05:49 AM

bump...

Disco Mike · 04-24-2007, 06:22 AM

If you are having other problems with the a/c control unit, it ,ay be safe to assume that is has or is failing. Here is a link to used heads just in case that is the problem,
http://www.roverlandparts.com/index....S&Category=300
Mike

never be over rover · 04-24-2007, 07:40 AM

is the control unit the only module that would determine that? only reason i'm asking is because with these rovers it always seems like theres a million computers between point a and point b.

Elemental · 04-24-2007, 07:57 AM

Operation of the clutch is controlled by the ATC ECU.

After installation of a new ATC ECU, it must be initialized using Testbook or similar from proper operation.

To engage the compressor clutch, the ATC ECU first outputs an A/C request signal to the Engine Control Module (ECM). If the ECM agrees that the compressor can be engaged, it responds with an A/C grant signal to the ATC ECU. The ATC ECU then energizes the compressor clutch via the dual pressure switch. Automatic compressor operation is then governed by the input from the evaporator temperature sensor. If the temperature of the air leaving the evaporator decreases to the point where ice may form and restrict the air flow, the ATC ECU de-energizes the compressor clutch until the temperature of the air leaving the evaporator increases again.

The ATC ECU also de-energizes the compressor clutch if the A/C OFF switch is pressed, or if the ECM withdraws the A/C grant signal (e.g. because of engine overheat or high load conditions).

If you dont have one yet, get a service manual for this truck.

never be over rover · 04-24-2007, 12:53 PM

Thx. Thats the kind of info i need. Which component do you think is the most common culprit?

And do you know where i can download a manual for free (if possible). I got pdf for my yamaha and bimmer, but the rover manuals seem harder to come by.

Elemental · 04-24-2007, 12:57 PM

Nope.... In fact, you may have to *gasp* buy a manual.

never be over rover · 04-24-2007, 12:58 PM

Hey, the best things in life are free.

never be over rover · 04-24-2007, 01:52 PM

AAYYYYYY!!!!! I FOUND THE MANUAL FOR FREE!!!

HERE'S THE LINK:

http://www.landrover.ee/est/varia/downloads/cars.htm

JUST SCROLL DOWN TO THE BOTTOM FOR RANGE ROVER II AND RIGHT CLICK THEN HIT SAVE TARGET!!!

I'LL POST IN NEW THREAD AS WELL!!!!

04-23-2007, 01:08 PM	#1 (permalink)
never be over rover All White Wit' Peanut Butter 96 4.0SE Join Date: Apr 2007 Posts: 31 Gallery: 0	No A/C !!!! My A/C hasn't worked since i bought my 96 RR 4.0 last fall. Now that it's spring i wanted to get it ready for the summer. I checked the r-134a level and the system is charged. When I power the condensor directly it starts up and i get cold air. I didn't want to jerry rig a switch, and i don't fully understand the LR A/C system? A couple portions of my climate control display dont work should i be looking at that, or is there some computer i should be hunting down. Any digrams or suggestions of diagnostic procedure would help greatly.

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04-24-2007, 05:49 AM	#2 (permalink)
never be over rover All White Wit' Peanut Butter 96 4.0SE Join Date: Apr 2007 Posts: 31 Gallery: 0	bump...

04-24-2007, 06:22 AM	#3 (permalink)
Disco Mike Moderator Join Date: Aug 2004 Location: Parker, Colorado Posts: 5,455 Gallery: 0	If you are having other problems with the a/c control unit, it ,ay be safe to assume that is has or is failing. Here is a link to used heads just in case that is the problem, http://www.roverlandparts.com/index....S&Category=300 Mike

04-24-2007, 07:40 AM	#4 (permalink)
never be over rover All White Wit' Peanut Butter 96 4.0SE Join Date: Apr 2007 Posts: 31 Gallery: 0	is the control unit the only module that would determine that? only reason i'm asking is because with these rovers it always seems like theres a million computers between point a and point b.

04-24-2007, 07:57 AM	#5 (permalink)
Elemental Senior Member Join Date: Feb 2007 Posts: 3,149 Gallery: 0	Operation of the clutch is controlled by the ATC ECU. After installation of a new ATC ECU, it must be initialized using Testbook or similar from proper operation. To engage the compressor clutch, the ATC ECU first outputs an A/C request signal to the Engine Control Module (ECM). If the ECM agrees that the compressor can be engaged, it responds with an A/C grant signal to the ATC ECU. The ATC ECU then energizes the compressor clutch via the dual pressure switch. Automatic compressor operation is then governed by the input from the evaporator temperature sensor. If the temperature of the air leaving the evaporator decreases to the point where ice may form and restrict the air flow, the ATC ECU de-energizes the compressor clutch until the temperature of the air leaving the evaporator increases again. The ATC ECU also de-energizes the compressor clutch if the A/C OFF switch is pressed, or if the ECM withdraws the A/C grant signal (e.g. because of engine overheat or high load conditions). If you dont have one yet, get a service manual for this truck.

04-24-2007, 12:53 PM	#6 (permalink)
never be over rover All White Wit' Peanut Butter 96 4.0SE Join Date: Apr 2007 Posts: 31 Gallery: 0	Thx. Thats the kind of info i need. Which component do you think is the most common culprit? And do you know where i can download a manual for free (if possible). I got pdf for my yamaha and bimmer, but the rover manuals seem harder to come by.

04-24-2007, 12:57 PM	#7 (permalink)
Elemental Senior Member Join Date: Feb 2007 Posts: 3,149 Gallery: 0	Nope.... In fact, you may have to gasp buy a manual.

04-24-2007, 12:58 PM	#8 (permalink)
never be over rover All White Wit' Peanut Butter 96 4.0SE Join Date: Apr 2007 Posts: 31 Gallery: 0	Hey, the best things in life are free.

04-24-2007, 01:52 PM	#9 (permalink)
never be over rover All White Wit' Peanut Butter 96 4.0SE Join Date: Apr 2007 Posts: 31 Gallery: 0	AAYYYYYY!!!!! I FOUND THE MANUAL FOR FREE!!! HERE'S THE LINK: http://www.landrover.ee/est/varia/downloads/cars.htm JUST SCROLL DOWN TO THE BOTTOM FOR RANGE ROVER II AND RIGHT CLICK THEN HIT SAVE TARGET!!! I'LL POST IN NEW THREAD AS WELL!!!!

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