2000 Expy overheats now...
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5th Wheeling
Joined: Aug 2023
Posts: 27
Likes: 2
That doesn't 100% mean it's not clogged up but I haven't seen any other signs of foreign material suspended in the coolant. The old thermostat was clean. Inside of the old hoses are clean too.
I was running a new but very cheap temp sensor from Amazon that might be suspect. Yesterday morning it was reading 130 deg and I hadn't even started the engine yet! (truck was parked in the shade)
I'm going to change that sensor out for the $100 MotorCraft one that I picked up this morning. Hopefully it reads cooler. (and hoping the engine is running cooler than the computer thinks it is...)
thx,
Jim
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5th Wheeling
Joined: Aug 2023
Posts: 27
Likes: 2
I fixed it!
It was the cylinder head temp sensor the whole time.
I'm not sure how I came up with the part number I ordered the 1st time but it was wrong.
I bought another one today at a local parts store. I compared the 2 sensors with an OHM meter and they were way different. The newest one had a lot more resistance.
The lower resistance made the computer "think" it was a lot hotter than it was. It also caused the oil light to come on and threw it into limp mode several times yesterday.
I thought it was odd that the oil light was on but the oil pressure "gauge" in the dash remained at normal.
I put the new sensor in the truck and it runs great. I actually can't get the engine to operating temp! (no thermostat installed)
Tomorrow I'll flush out and refill the coolant system, install the thermostat, and I'm good to go.
thx,
Jim
It was the cylinder head temp sensor the whole time.
I'm not sure how I came up with the part number I ordered the 1st time but it was wrong.
I bought another one today at a local parts store. I compared the 2 sensors with an OHM meter and they were way different. The newest one had a lot more resistance.
The lower resistance made the computer "think" it was a lot hotter than it was. It also caused the oil light to come on and threw it into limp mode several times yesterday.
I thought it was odd that the oil light was on but the oil pressure "gauge" in the dash remained at normal.
I put the new sensor in the truck and it runs great. I actually can't get the engine to operating temp! (no thermostat installed)
Tomorrow I'll flush out and refill the coolant system, install the thermostat, and I'm good to go.
thx,
Jim
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