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Old 06-10-2017, 10:32 PM   #1
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Over heat on the SVTF, help diagnose?

So my 04' SY SVTF was taken up the canyon road today. So was staying in higher rooms but only. Going 45-50 Mph. It was about 70* F outside, so not a hot day but also had the AC on.

The oil temp gage was started going high and the water temp also made its climb. It almost seemed like there was air in the system. When I dropped down gear and had higher revs the water temp sensor started dropping down. But as soon as my revs stayed low it started climbing again.

The car has performed flawlessly. The 1500 mile trip from MI and UT. The 7 months I have DD the car, and the 60 miles back down the canyon and home it was sold.

Thoughts on what could be causing this? Coolant level is where it should be. Clean new coolant from when I did the timing belt in December. PO had replaced the thermostat housing I think 30-40k back because it was leaking so it has a relatively new thermostat but belive stock temp. (on the SVT is that the same as the regular Zetec?)

Oil is a bit over the fill line (would an over filled condition cause it to overheat?)

When at the top I turned the car back on after I check coolant levels and with max AC both fans turned on and at high speed. So the relay and resistor are working. Guess there could be a reason the signal from the ECU would not be turning on if the AC was not on?

Likely going to drain the fluids and swap out the thermostat with a 180. I have all the stuff for a header wrap, just need a day to do the work. That should help drop down engine Temps?

Could a clogged cat cause this? I am not getting codes.

I have a Xcal2 (married to my ZX3) , does that allow for data logging on the SVT ECU?

Thanks for any help you can provide.


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Old 06-11-2017, 10:06 AM   #2
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Chris the fan resistor and/or the pigtail needs to be looked at or replaced.

It sounds like one of your fans is not coming on is my guess.
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Old 06-11-2017, 10:10 AM   #3
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And to test it just let it idle without the AC on.

Your oil and water temps will jump. Don't do it too long or you'll cook the oil and maybe more.

When rolling and air hitting the motor the temps will drop back to normal.

In traffic stop and go the temps jump because the fan's not kicking on.
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Old 06-11-2017, 10:35 AM   #4
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I have never had a problem at idle. I know the aluminum head and small nature of the engine makes it difficult to heat up. Mt ZX3 would take about 20 min of filing before a fan would kick on. (that may have been done during the winter though... )

I will. Try the idle with the AC off, stop and go traffic around
town while DD have not shown any spikes in themp. Oil color is still a nice light amber from oil last oil change about 3k miles back (Mobil 1 w/ Motorcraft oilfilter). Thanks for the help and will provide some updates.

I am not sure on the type of radiator the PO('s) may have replaced as it does not fit quite right in the isolator posts. I am going to try to see if I can find the brand or part number for the radiator also.
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Old 06-11-2017, 10:48 AM   #5
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Here is the radiator number from the one I put in my SVT.

Purchased through my dealer for 100 bucks.
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Over heat on the SVTF, help diagnose?-svt-radiator-001-40%25.jpg  

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Old 06-11-2017, 11:10 AM   #6
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From your dealer are you referring to the Ford service department? Looking on rock auto the 2296 part number matches up for some of the brands.

The SVTF used a larger radiator (increased thickness? ) but read that basic after some point they reduced inventory costs by just using the same radiator for all Foci regardless of motor type.

Wonder if the PO some how got a non SVT one? I will check out part number (if still possible) and idle Temps (Xcal2 should data log right?) this out after the Canadian grand prix.
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Old 06-11-2017, 11:39 AM   #7
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Yes purchased from Ford service department. Onlu difference I saw was the drain plug.
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Old 06-11-2017, 11:50 AM   #8
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I have seen some have the plug will stay in vs just a butterfly plug and also a combo of a side drain port to "control" the drain. Looking on line a number of the radiators have different size by just a 1/2" or less. Likely just spec differences from.. I clouding a flange or a port on the over all size?

Likely call up the dealer and pick one up that way if it's in the $100 price tag still.
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Old 06-11-2017, 12:02 PM   #9
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I got mine at cost. Was a gift from the GM because I was still waiting for the RS to show up lol.

They still give me discounts when I buy stuff for the SVT.

I bet Steve at Tasca or Village Ford has them cheaper.
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Old 06-13-2017, 10:59 PM   #10
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When I had my ford ranger I had this same issue, the vanes on my water pump were rotted off so it wasn't pumping very well in the lower rpm ranges (while under load) at idle it was fine because it's a light load and not generating much heat. Coolant levels good?
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