Abnormal ECT pattern - Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 1 Old 07-23-2012, 05:42 PM Thread Starter
Compression Ignition Addict
dnf12908's Avatar
Join Date: Aug 2007
Location: northeast B.C.
Posts: 696
Thanks: 24
Thanked 9 Times in 9 Posts
Mentioned: 1 Post(s)
Quoted: 35 Post(s)
Feedback Score: 0 reviews
Abnormal ECT pattern

I just got back from a 6200 km. trip. It was 90+ degrees the whole time. I was towing a 26' TT. The first day my coolant temps were all over the place, going right off the top of the gauge putting the truck in limp mode seemingly on level ground.

Then it would cool right down and be good for a while, then it would happen again. I bought a new thermostat, changed it out in the campsite the next morning and all was good as far as the temps stabilizing, but the overall temps still seemed too high. Cruising at 65 mph, the temp would be around 217. Pulling a slight hill without backing off would send the temps to 230+.

The last day of the trip, this situation got worse. Pulling a hill, my Insight would show 245+! Of course I backed off and cranked up the heater, and that cooled it enough to get over the hill. Most of the time it would cool down quickly once I broke over the top of the hill. The odd time the temp would stay up for quite a while. The fan would come on at 230 but not stay on all the time as the temp climbed. As a side question, is the fan governed by ECT or EOT? My deltas are within the 15 degree spec.

Does this all sound like a water pump failure? Or could it possibly still be a faulty thermostat, even though I just replaced it?

What are the chances of this being a head gasket issue? I don't have any typical symptoms (puking, white smoke, loss of coolant, moisture in tailpipe, etc)

I've got a water pump coming tomorrow but I'd like to be sure what the issue is before I dive into that. Any help would be greatly appreciated.


'03 F-350 6.0L C/C SB FX4 SRW
SCT X3 w/tunes by MKM
MBRP exhaust-turbo back
EGR delete
ARP studs
OEM gaskets
ELC coolant & filter
MTW Stage 1 turbo w/billet wheel
FPR (blue spring)
'04 upgraded front cover
BPD fan clutch adapter/w 7.3 fan
stator delete
All-aluminum intercooler(upgraded OEM unit)
Amsoil bypass oil filter
Edge Insight monitor
Harley headlights w/Gensii LED bulbs
2008 rear diff. cover
EnviroSave powertrain treatment,

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
dnf12908 is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome