Having problems with your 2002 Ford SVT Focus ?
Temp gauge up and down, why? 1/4 on a run and upto 1/2 in traffic??? mondeo 2002 tdci
There could be many causes for this to happen. The thermostat could be sticking and only opening enough during higher engine rpm. The fan may not be coming on. The system could be clogged and not allowing much coolant to circulate until higher rpm. If this is something you want to tackle on your own I would suggest changing the Thermostat and thoroughly flushing the cooling system, then see how it acts and go from there.
These gauges are not accurate, however they do give a general idea of engine temp. A faulty Thermostat or broken electric fan can also cause a increase in temp. But under normal conditions the coolant temp will be around 180 - 220 degrees.( be careful performing this test) If you have a thermometer before the car is started you can remove the radiator cap and insert the temp probe, then start the car and let it run until the thermostat open. You will know when it open because you should see water moving in the radiator. If the temp is in this range you should also hear or see the electric fan come on. If the temp is greater then this you may have a partially obstructed radiator that needs flushed, a bad thermostat or water pump.
Repair Help & Product Troubleshooting for 2002 Ford SVT Focus
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.