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Vauxhall Astra 1.4, cooling fan problem.... ***FIXED.....sort of***

Posted By Hammond_Auto 4/12/2008 6:24:56 AM
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Vauxhall Astra 1.4, cooling fan problem.... ***FIXED.....sort of***

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Hammond_Auto
 Posted 4/12/2008 6:24:56 AM
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hi all, bear with me, this is a saga.......

Vauxhall Asra 1.4, V reg (99) X14XE engine, with air con, it is a courtesy car for a garage, customer took it and put it into the back of another car, the garage purchased it back from the insurance company and repaired themselves without puting new air con parts in, they left out the condensor and fan, reciever/drier and pipe work to the compressor, as the A/C is controlled by an ECU the warning lamp was on and the cooling fan runs all the time the engine is running, I went to look at the car to sort out the warning lamp and fan running faults and found that the system needed to have a condensor fan pluged in and a system pressure sensor, these were purchased and fitted, as there is no pipework the pressure sensor just sits in the engine bay at atmospheric presure, now that these parts have been put on I can erase any fault codes and make the warning lamp go out but the cooling fan and condensor fan still run at full speed all the time, I have tried swapping the ECU with an identical one and get the same fault, the engine coolant temperature sensor is also new.

What am i missing? does the pressure sensor need to see some sort of pressure to turn off the fans? if so can i put some resistors accross the terminals in the plug?

Help..... please......

Dave.

4/28/2008 2:44:37 PM by Hammond_Auto
Speedy
 Posted 4/12/2008 5:55:14 PM
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Sure its not a problem with the engine cooling module under the nearside front bumper causing the fans to run
Hammond_Auto
 Posted 4/13/2008 9:45:10 AM
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i have already tried substituting the control unit for a another that i know to work, is there an overheat switch that i have missed?
Chuck_Wagon
 Posted 4/13/2008 4:48:32 PM
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Dave,

The easiest option is to restore the AC system to it's original spec. You're already half way there, why not continue?

Chuck


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Hammond_Auto
 Posted 4/13/2008 6:29:25 PM
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Hi Chuck, thanks, does the pressure sensor need to have some sort of pressure acting on it to turn the fans off then?

The owner does not want to spend any more money on the car so we are just looking for a quick fix to stop the fans from running all the time.

Speedy
 Posted 4/13/2008 6:48:49 PM
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Really stupid suggestion probably but the air con switch is turned off

Have took air con off cars in the past and its never made the fans run ........................perhaps its an engine temp sensor or the wiring for it or the engine ECU at fault and not the aircon

Hammond_Auto
 Posted 4/14/2008 9:21:21 AM
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Hi speedy, no sugestion is ever stupid, but the a/c is turned off lol, I have checked the wiring to the ECU and all is ok as far as i can see, the car did have a nasty crunch and i expected the wiring to be damaged but it was ok, the engine collant temp sensor is new and so is the system pressure sensor, the fans were not running before the crash and i was told that the a/c system didnt work pre crash either (no gas)...
Speedy
 Posted 4/14/2008 2:32:56 PM
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Have you changed the engine cooling ECU or the main engine ECU ?

It could be a fault in the engine ECU or damaged wiring to it from the coolant sensor

Or it could be a nipped wire near the cooling ecu from the smash ...................sounds like a nightmare

Chuck_Wagon
 Posted 4/14/2008 4:58:23 PM
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Dave,

"the fans were not running before the crash and i was told that the a/c system didnt work pre crash either (no gas)... "

You are really throwing wobblies at us here mate!

I must admit to having no idea as to how to make the system operational if some of the critical components are missing.

My only input on this is to restore everything to the normal working condition and then take it from there.

Chuck

 


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K And R
 Posted 4/14/2008 5:31:00 PM
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Dave.

Would be nice to know what you are using to read this Wink I can get live data for the Fan module, can you.

Kev.

"If you dont KNOW how it works, don,t try to test or fix it"


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