Fake overheating 2000 V10
Post Fiend
Joined: Jun 2014
Posts: 6,801
Likes: 7
From: DFW, TX-GoldCanyon, AZ
OK guys,
Thank you all for the tips and insight.
Today I had to drive home with the truck, about 140 miles. .............................. I pulled over, let the engine run, checked under the hood again, no elevated temps, so I took the gamble and just drove it home with the gauge pegged red for 50 miles. Truck ran fine the whole way. So I'll go and replace the temp sensor this week and let you know.
Berrie
Thank you all for the tips and insight.
Today I had to drive home with the truck, about 140 miles. .............................. I pulled over, let the engine run, checked under the hood again, no elevated temps, so I took the gamble and just drove it home with the gauge pegged red for 50 miles. Truck ran fine the whole way. So I'll go and replace the temp sensor this week and let you know.
Berrie
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
An easy check would be to monitor the temperature from the OBD port with a Scangauge or other type of scan tool. When the gauge pegs high what temp is the PCM seeing? How fast does it get there?
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Nobody said it was stuck shut.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
That is certainly true. The fact that it showed normal after you restarted it indicates to me that you have an electrical issue with the sensor. I would start by testing the sensor and the associated wiring.
An easy check would be to monitor the temperature from the OBD port with a Scangauge or other type of scan tool. When the gauge pegs high what temp is the PCM seeing? How fast does it get there?
An easy check would be to monitor the temperature from the OBD port with a Scangauge or other type of scan tool. When the gauge pegs high what temp is the PCM seeing? How fast does it get there?
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
Replacing the thermostat isn't expensive and may help, but it might not fix the problem. If in doubt I'd spend the $10 and do it anyway.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
I get that his symptoms are similar to yours, but have you honestly never heard of an electrical short in the sensor or wiring causing a fake overheating condition?
Replacing the thermostat isn't expensive and may help, but it might not fix the problem. If in doubt I'd spend the $10 and do it anyway.
Replacing the thermostat isn't expensive and may help, but it might not fix the problem. If in doubt I'd spend the $10 and do it anyway.
Then I would pull over and it would still be idling but if I shut it off and restarted it would be fine...........for awhile. I could put my hand on the valve cover for a normal amount of time at that time also, and there was no sensation of heat on my face.
Post Fiend
Joined: Jun 2014
Posts: 6,801
Likes: 7
From: DFW, TX-GoldCanyon, AZ
I guess I would tend to believe that the sensor would indicate an UNDER-TEMP situation if it were stuck open..
I have no idea where the temp sensor is on the OP's truck. I suppose I could step outside to my 99 and see where it is, but it may not be in the same location. Yes, sometimes they can be a bear to get at..
I have no idea where the temp sensor is on the OP's truck. I suppose I could step outside to my 99 and see where it is, but it may not be in the same location. Yes, sometimes they can be a bear to get at..
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Cargo Master
Joined: Feb 2011
Posts: 3,450
Likes: 13
From: Forest lake minnesota
That is certainly true. The fact that it showed normal after you restarted it indicates to me that you have an electrical issue with the sensor. I would start by testing the sensor and the associated wiring.
An easy check would be to monitor the temperature from the OBD port with a Scangauge or other type of scan tool. When the gauge pegs high what temp is the PCM seeing? How fast does it get there?
An easy check would be to monitor the temperature from the OBD port with a Scangauge or other type of scan tool. When the gauge pegs high what temp is the PCM seeing? How fast does it get there?
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
He needs to replace the stat AND the cap at a different time than the sensor to find the cause. I made that mistake with a power steering pump and fixing the axle u-joints at the same time one time. What was jerking the steering wheel was a big mystery and never really solved but I am leaning towards the u-joints.
Post Fiend
Joined: Jun 2014
Posts: 6,801
Likes: 7
From: DFW, TX-GoldCanyon, AZ
Okay - I just went out and checked for the temp sensor location on my 99 SD V10.
It is right on the top of the intake manifold coolant crossover about 3" away from the thermostat housing and would take no more than 20 minutes to change including coolant drain and refill..
It is right on the top of the intake manifold coolant crossover about 3" away from the thermostat housing and would take no more than 20 minutes to change including coolant drain and refill..
Postmaster
Joined: Jan 2012
Posts: 2,693
Likes: 3
From: West of Chicago
I had an 00 F350 V10 truck that did the same thing. I had a bad temp sensor that caused all sorts of issues. I replaced the thermostat and cap and the issue remained. I took it to my mechanic at that point since I'm not good with electrical in cars. He cleaned all the grounds and replaced the sending unit. I had no issues after that point.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
I had an 00 F350 V10 truck that did the same thing. I had a bad temp sensor that caused all sorts of issues. I replaced the thermostat and cap and the issue remained. I took it to my mechanic at that point since I'm not good with electrical in cars. He cleaned all the grounds and replaced the sending unit. I had no issues after that point.
Postmaster
Joined: Jan 2012
Posts: 2,693
Likes: 3
From: West of Chicago
Correct, my truck never went into limp mode. I agree with you that there is probably a thermostat issue or cap issue. Rarely the water pump could be on it's way out.
I would start with the cap, any auto parts store will rent a pressure test kit. Test your cap and make sure it holds to the proper psi. I have had thermostats stick partially closed before.
My 03 Crown Victoria only got hot when driving around town and it was at random. I did the old boiling water trick and sure enough it never fully opened.
I would start with the cap, any auto parts store will rent a pressure test kit. Test your cap and make sure it holds to the proper psi. I have had thermostats stick partially closed before.
My 03 Crown Victoria only got hot when driving around town and it was at random. I did the old boiling water trick and sure enough it never fully opened.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Okay - I just went out and checked for the temp sensor location on my 99 SD V10.
It is right on the top of the intake manifold coolant crossover about 3" away from the thermostat housing and would take no more than 20 minutes to change including coolant drain and refill..
It is right on the top of the intake manifold coolant crossover about 3" away from the thermostat housing and would take no more than 20 minutes to change including coolant drain and refill..