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Old 05-22-2013, 11:22 AM   #1
zzzzz
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04 focus - temp sensor in red & loss of power - electrical problem?

Hey guys ford nooby here!
Recently brougt a ford focus lx - 1.6 petrol - 48000 mileage - 2004 reg

car was working fine then i had it serviced including radiator flushed out with radflush & new anti-freeze.

At first car was fine but on the motorway the temperature warning light appeared & the needle jumped into the red.
No pressure or water loss but the needle kept on jumping from halfway in to the red (but never below halfway).

Local garage who gave it the once over & eliminated the following: blocked radiator/water pump/air lock/radiator fan working
heaters blow hot air, no pressure or water loss except two main water pipes once is hotter than the other.

Following day after a 20 mins drive the temp light appeared again, needle in red & engine management light appeared which triggered the engine cut out safety feature; so the car would stop accelerating.
3 codes appeared - P0420 catalyst system/ P0340 camshaft position sensor/ P1299 manufacturer control - all codes cleared.

Back to the garage who changed the water/temperature sensor (orgional ford part) & thermostat - result: car stopped cutting out
but temp needle still jumps in to the red after 20 mins & going above 50 mph -ish

i dont have much money left to spare & i im not too confident the mechanic can sort the problem without bankrupting me! I would apppreciate any help
from you guys


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Old 05-22-2013, 11:39 AM   #2
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I wouldn't immediately disregard the temp warning as false until I took readings with other tools to verify coolant temp.

Without further data, you might want to check the ground wires, they are just as important for the electronics as the positive wires.

Are the radiator fans turning on?
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Old 05-22-2013, 11:43 AM   #3
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yes i forgot to mention the fan is working also.
can you tell me where are the ground wires located plz?
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Old 05-22-2013, 01:02 PM   #4
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Quote:
Originally Posted by zzzzz View Post
except two main water pipes, one is hotter than the other.


Right there is the answer.
Replace the faulty Thermostat.
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Old 05-22-2013, 01:28 PM   #5
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sorry i did mention in op the the thermostat was also replaced
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Old 05-22-2013, 01:32 PM   #6
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Well then, make sure it wasn't installed backwards.
The cycling hot/cold really sounds indicative of a faulty one.
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Old 05-22-2013, 01:45 PM   #7
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Moved to "General Technical Chat".
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Old 05-22-2013, 05:10 PM   #8
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ok understood but now that the part has been fitted is there anyway of checking what direction the thermostat was installed in? apart from asking the mechanic?
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Old 05-23-2013, 01:47 PM   #9
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Definitely could be the thermostat. I've even bought brand new ones from autozone that were faulty. Also, your water pump may be locking up or if it's ever had pure water in the cooling system and had the motor started while temps outside are freezing, it coulda snapped all the little plastic veins off in the pump. Also, as crazy as it sounds, check for a collapsed coolant hose. I've seen it before!
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