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Vauxhall Zafira cooling fans ***FIXED***

Posted By Kev50 7/9/2011 1:20:30 PM
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Kev50
 Posted 7/9/2011 1:20:30 PM
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Hi Guys

2002/02 plate Vauxhall Zafira 1.8 club Z18XE

The problem is the cooling fans keep running and the coolant warning lamp comes and goes. So done a scan and no codes in engine management if I go in to instrument panel I get code 166 (engine coolant temperature circuit high input)

The weird thing is if I disconnect the cooling fans and start from cold and allow the engine to get to about 70 degrees and plug the fans in everything works ok until I switch off and allow things to cool then the fault re occurs.

So far changed the coolant sensor for new genuine vx and changed the control box under the front bumper for a good second hand unit removed the dash clock assembly  checked all the connections and nothing obvious.

Has anyone had this problem before,

Any help much appreciated.

Kev. 

8/17/2011 7:07:03 AM by Kev50
K And R
 Posted 7/9/2011 1:27:21 PM
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Kev50

You need to read the cooling module !!! Tech 2 will do this Wink

Kev.

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

Kev50
 Posted 7/9/2011 1:52:35 PM
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Is the cooling module the unit under the bumper?
K And R
 Posted 7/9/2011 2:44:36 PM
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Kev50

Yes N/S/F and Tech2 will supply lots of live data as well as it,s own fault codes.

Kev.

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

7/9/2011 2:46:04 PM by K And R
Kev50
 Posted 7/26/2011 5:04:48 PM
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Hi Guys

Managed to get hold of opcom and the codes are,

Coolant module

163 coolant temp no signal

Instrument panel

166 coolant temp circuit high input

sometimes get 164 incorrect signal

Im guessing its another dodgy Simtec 71 ecu

Dcspringlane
 Posted 7/26/2011 5:18:12 PM
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Unlikely to be ecu more likely to be broken wire !!check plugs/wiring carefully!!
K And R
 Posted 7/26/2011 5:43:05 PM
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DC

Yeap Wink

Kev 50

You need to load test the circuit.

Kev.

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

Kev50
 Posted 7/26/2011 5:49:43 PM
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Ive had the dash out and checked/cleaned all connections

Changed the coolant sensor for genuine vauxhall traced the wires back to ecu and seem ok

Changed coolant module for good second hand and opened up the loom about six inches up from each multi plug all seems ok with no signs of corrosion or damage but I have not got involved with the ohms meter and pin data, Maybe thats the next step !!!

What puzzles me is it all works ok when its cold and once its warmed up but its the bit in the middle thats the problem.

One other thing, If I go into engine managment live data and scroll down to ambient temperature its showing -40 but on the dash its a normal reading so not sure if this is clue. 

Kev50
 Posted 7/26/2011 6:02:45 PM
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Kev

How do i load test a circuit without causing any damage?

K And R
 Posted 7/26/2011 6:09:09 PM
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Kev 50

" scroll down to ambient temperature its showing -40 but on the dash its a normal reading so not sure if this is clue." w00t

Do you understand what ambient temp is ?

As for load testing check out "testlit" .  Can also be done using a bulb

Kev.

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


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