LS / MKZ :: 07 Overheating - Car Doesn't Get Up To Speed Going Up Hills


Sep 20, 2013

The engine light comes on and the wrench. Car doesn't get up to speed going up hills when this happens. One time it would not go over 30 without a whining noise. It's happened now 3 x's in 10 days.

First time the radiator cap was not on securely. Apparently that must have been from the shop because I have only had it for 10 weeks. Which is 2 weeks over the warranty and 2K miles over warranty also. Just my luck.

Doesn't happen every day, appears to be on hot days. When it's cool in the 50's or 60's I'm fine. First happened when it was high 90's. Then today its about 80.

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$2000+ later I have new tires, a 4 wheel alignment, new rotors and pads fore and aft, a new tie rod end and a car that goes whoop whoop whoop when I accelerate or climb a hill.

The car has 125,000 km. (78,000 mi.) on it and has been very well maintained. Detonation maybe?

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Based on the collective wisdom of this forum, does this is a failing water pump, or a partially opening thermostat? This past winter it seemed to take longer for it to get warm. I'm leaning to thermostat.

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The dealer told my wife there could be a bad connection on the battery and they tried tightening the connections and the second time they replaced a battery cable, which was not cheap, and how either of those could affect engine heat is beyond me. I am at times almost suspicious that perhaps I just have a temperature gauge that goes psycho every now and then, but it goes psycho consistently. I don't think it's a warped temp gauge. The dealer hasn't mentioned the thermostat as a possibility and I'm thinking of pulling it out and testing it myself.

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This morning in traffic for 45 minutes and no overheating of any kind, temp didn't move from full vertical... That being said, when i got to my office, I popped the hood and tossed the AC on while parked, only 1 fan (pass side) was running, aren't they both supposed to be going with the AC on?

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I was thinking I would make an appointment with the dealer to check it out. But didn't want to do that if this is normal behaviour.

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Now my question is, how to dismantle the speedometer cause I want to take out the speed gauge from my old one a replace it with the new one i know its much easy to change the whole thing but I don't want to play with the mileage I have on my car.

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I noticed recently that my car has been running a little sluggish lately and can't figure out why. What I mean by sluggish is that when I press the gas the car is relatively slow to get up to speed. Getting onto the freeway for example, or just trying to take off "quickly" (it's a Hybrid so not trying to race anyone) just not noticing the car doesn't seem to get up to speed as quickly as before.

This is with ECO mode on or off, just more noticeable with it on. Just got the oil changed this morning, still noticing it.

The car has only about 35K on it so really puzzled as to what might be causing this problem.

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the fluid is burnt now but wasn't that bad until the trans started doing this. I have pulled off the pan and inspected the filter and it does have metal debris in it, pulling the valve body off tonight before work (work 3rd shift) to inspect that, i think it has something to do with the solenoids or valve body because it actually moves but then quits until i restart the truck. Also does the transfer case use fluid from the transmission? or are the fluids separated between the 2.

Truck has 4.0L SOHC with a 5R55E in it 4WD...

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So whats left? I never hear my fan clutch......should I? I've had other trucks and the fan roared when first started for a few seconds, and then again when you were hot...they really roared.

Is it possible for the egr port where it goes into the throttle body to be plugged? guess I should've checked that when I had the egr off. Would an aux. fan be a waste of time?

This is pulling a 3500 lb camper trailer up moderate hills.

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