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I have a 2007 Ford Edge, it has ~180,000 miles on it. The

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I have a 2007 Ford...
I have a 2007 Ford Edge, it has ~180,000 miles on it. The car was running great, the last couple years the heater has been on the fritz in the severely cold days, but was still pumping out enough heat for me to put off an inevitably expensive repair. I finally took it into a Firestone, they said that the heater was fine, they did a flush on the radiator to make sure it wasn't involved and sent me on my way for $400...I wasn't too happy, because it was still not working at 100% during the last cold days this spring. Then this summer overheated. I got it home after I let it cool with the heater blasted on a 90 degree day, but it got home with a couple stops to let it cool before it got all the way to the red at all. I did my research and found the most probably causes (from what I could find) were either the thermostat: I changed this since it was only a very cheap and easy part to replace, this did not improve the overheating issue. I then found it may be either the A/C or the water pump as the most likely culprits. I knew I couldn't do my water pump living in an apartment with limited space, time and tools and same with the A/C if it was anything beyond using a kit can to recharge it, and I know that you might damage the system more with those if it is under certain conditions. I did more research though to try and narrow it down for the garage and my mind (so I wouldn't get too ripped off), I found that the water pump would be causing it to overheat at idle, more than at speed. The car however, would begin to overheat much more often at high speeds rather than at idle. I then looked at A/C, if I ran the car with no A/C or fans it would rarely begin to overheat, this lead me to believe it was A/C related most likely. I opted to take it into the garage, when I got there I told them what was happening, they said they think it might be the thermostat right off the bat, I told them I had already changed it, I said I thought it was probably the pump or the A/C. They took it for the night and said they would look into it. I won't get into the how or why, as this is a debate on how to get this fixed rather than shop ethics...but they rebuilt my transmission and changed the thermostat I already had changed and claimed it was fixed. As I am sure you can guess my naive self didn't get far before the car overheated again. I took it back to the garage and they ran more tests eventually finding that my lowspeed/idle fan was not working. They accredited it to either a bad assembly or a bad PCM. They investigated to find it was the fan not the computer and replaced that claiming to fix the problem. (Here is question 1: In your professional opinion, if that was the case, would I or would I not have found that specific problem during my testing of water pump failure...during this time I tried to get the car to overheat in Idle which happened only rarely vs much more frequently at highway speeds (like I mentioned with A/C on vs with it off) would the fan not have caused it to overheat during those tests at idle if it was the original problem?) The car however still overheated again today. I am now just wondering what someone else might think it is besides that garage, and I would love a professional opinion...if you can give one on what it might be causing my heater to not work and my A/C to cause overheating of the entire car? And also if indeed a failed fan would manifest itself as overheating a car during idle vs high speeds? Thanks so much!
Submitted: 2 years ago.Category: Ford
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Answered in 21 hours by:
8/9/2015
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 49,094
Experience: 16 years experience
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When you use the AC this puts an extra load on the engine, which incorporates into more heat, it also results in the condenser in front of the radiator getting hot. So if there is a fan issue the AC heat will cause the radiator to get hot. For the dash vent output not putting out heat, see if the heater core hoses at the firewall are hot. They should be above 160 degrees, both of them. If so then the heat concern is the blend door in the dash, nothing under the hood.

Overheating, your water pump test is semi good, the fact is there are just no good tests on a water pump compared to visual inspection. Based on what you have done, I would address the fans and get them working correct, then perform a compression test to make sure combustion pressure is not packing into the cooling system from a head gasket leak, then if its still occurs and the compression test was good, then replace the pump.

You want a excellent 5 star answer & I would like to be rated the same for providing it. Consider I don't know your skill level & I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies. Try your best to respond with good detail so I can do the same. I normally log in at 3pm and work late. A rating is required. Your rating me, what I type. I am not an employee of this website, nor have control over the fees or the time it took to get a response. If you rate negative or not at all you still paid, but I get nothing. I want you pleased with me and my efforts, so let me know if your experience here has come up short.

Thanks Chris

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