Welcome to part 2 of this repair on the cooling fan system on a 2003 Ford Focus. To see part 1 please click here.
I consulted the wiring diagrams further and found that there was a fan resistor located in the fan housing. After unplugging the connector this is what I found. One terminal was badly damaged on the harness connector.
The resistor was damaged as well.
I spliced in a new harness connector. The connector part numbers are Ford#4U2Z-14S411-DA Motorcraft# WPT822, The Electric Connection #4071
Installed a new resistor.
Hooked the connector to the resistor.
Retested the system and all is well. My guess is that the resistor and its connector were the original problem and poor test methods by the previous shop had pushed the terminal for the relay out of position.
Does it over heat as in boiling over or does the gauge go higher than expected? What is the ambient temperature? Does the a/c work properly on the car?
I am working on a 2003 Ford Focus with the single cam motor. I have replaced the head gasket and the thermostat. I next replaced the cooling fan relay and all was good. The car is still running hot for the customer but not for me. I drove the car for 11 miles in traffic and stop and go scenarios. I give her the car back and it it overheats in less than 10 miles. Help needed
Thanks for this post, after wondering why this car was overheating and the cooling fans would not come on if the AC was off, I pulled out the resistor and the plug and BINGO, it looked the same as your picture. Saved me an expensive trip to the shop! thanks bunches.
There are a lot of variables involved in these systems. One of which is the engine temperatures are higher than what most of us are used to. Does the cooling fan come on around 230F? Has it actually overheated, pushed coolant out? Do you have a scan tool or other tools to test with?
hello, i found your blog post while having almost the exact same problem. what happens is the car will try to overheat when i leave my house to go to work. it never actually overheats, the highest it has gotten is 120c this is going by the temp sensor reading when i put the car in diagnostic mode. when i was diagnosing the problem everything matched what you posted here. the relay was blown to hell the plug and resistor was also shot. i have replaced all of this and it is still doing it. i am about at the end of my sanity, any suggestions? please and thank you