Not getting up to running temp
Fleet Owner
Joined: Oct 2005
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From: Kentucky
Run the Key On Engine Off tests and stored code (CM) display to find out why the CEL is turning on.
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Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
What temperature is the gauge reading?
Where is the gauge attached to the engine?
When did this problem start?
Where is the gauge attached to the engine?
When did this problem start?
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Joined: Nov 2011
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From: SW Florida
pinkpantherusmincus, I read your reply to mean that OBD1 has a hard time reporting on whether or not the coolant temperature is within normal operating range. If that's what you meant, it's incorrect. OBD1 systems accept a direct input from a coolant temperature sensor just like OBD2 does, and would certainly not have any trouble using the reported value for diagnostics.
OP, yeah check codes but how long has it been since the t-stat was last replaced? If it ain't ever been changed then it wouldn't surprise me to pull the thermostat housing off and find the 'stat in pieces. They do wear out and break just like everything else mechanical.
If it were my truck the first thing I'd do is hit the thermostat housing with an IR temperature scanner.
OP, yeah check codes but how long has it been since the t-stat was last replaced? If it ain't ever been changed then it wouldn't surprise me to pull the thermostat housing off and find the 'stat in pieces. They do wear out and break just like everything else mechanical.
If it were my truck the first thing I'd do is hit the thermostat housing with an IR temperature scanner.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
It would not be the first time a "new" thermostat was bad out of the box. Pull it out and test it with hot/boiling water and a thermometer.
Postmaster
Joined: Nov 2011
Posts: 3,533
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From: SW Florida
Don't bother with the "fail-safe" thermostats either. Most people say they open once and stay that way. They're supposed to lock open if the engine overheats but apparently they tend to lock open even at normal temperatures, in which case you might as well have just not bought a thermostat in the first place.
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