300 I6 Running Cool, problem?
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300 I6 Running Cool, problem?
Well heres whats up. I changed my oil and Spark Plugs before I went on a 4.5-5 hrs trip to inlaws. After about an hr, I noticed my temp was lower than what it was running at before the services. (this is the first time I changed the plugs in 3 yrs. bought truck June of 04.) Unfortunately my guage doesn't have numbers, onlt the word NORMAL. Before I would normally see the needle around center of the word. However now it's not even over the "N". I know that it's good to have a cooler engine, but can it be too cool? Should I be concerned? On the way back it was cool too, and I was loaded down a bit. I wasn't Mountain driving but I still had a few good sized hills, the warmest I saw it was just the corner of "N". Hope this is a good thing! Any thoughts are welcome.
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I don't see any connection between what you did and the different temperature.
I guess it just picked NOW to act up.
If this is fuel injected, cooler is BAD because the computer senses the engine still needs a rich mixture = poor gas mileage.
If carbed, not a biggie.
The first component we always suspect in this scenario is a faulty thermostat...theyre cheap and prone to failure.
I guess it just picked NOW to act up.
If this is fuel injected, cooler is BAD because the computer senses the engine still needs a rich mixture = poor gas mileage.
If carbed, not a biggie.
The first component we always suspect in this scenario is a faulty thermostat...theyre cheap and prone to failure.
Elder User
Joined: Jun 2005
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From: northeast, KY
My father bought his 95 new with no miles on it, and since the day he's had it the thermostat has read right on the N. It hasn't ever went any farther after it has warmed up and he has 168K miles on it and still runs like a top.
I don't know if it was messed up when he bought it or not, but he's added a couple thermostats an it hasn't changed.
I don't know if it was messed up when he bought it or not, but he's added a couple thermostats an it hasn't changed.
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Joined: Jul 2002
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From: torrance
Originally Posted by inline6/91f150
It is EFI. SO I should have my thermostat checked out? How can I do that myself?
Post Fiend
Joined: Mar 2002
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From: Bonita Springs FL
A thermostat is like $6 - if there's any doubt, just replace it.
Every EFI Ford truck I've ever had has sat right on or a little before the N. I actually think that halfway up the gauge is too hot.
Every EFI Ford truck I've ever had has sat right on or a little before the N. I actually think that halfway up the gauge is too hot.
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Posting Guru
Joined: Apr 2005
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From: Hawkeye Country
Both my 82 and 86 hardly see the middle of the gauge. In my 96 the gauge moves quite a bit. when its warm it'll climb to about halfway, thermostat opens and it drops to below "N", climbs back up and drops again. Dose this maybe twice a minute when warm.
I'm with andym on this one, thermostats are cheap try a new and see what it does.
I'm with andym on this one, thermostats are cheap try a new and see what it does.
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Joined: Jan 2007
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From: Milltown, NJ
When you replace the thermostat be REAL carefull and make sure the new 'stat is laying correctly in the block housing. I don't know why Ford made it fit against the front of the block instead of on top of it like an 8 cyl.
Put a LITTLE black silicone on it to hold it in snugly.
I was stupid and tried to replace the housing piece on and the 'stat slipped down and I cracked my housing. That was without the silicone.
Put a LITTLE black silicone on it to hold it in snugly.
I was stupid and tried to replace the housing piece on and the 'stat slipped down and I cracked my housing. That was without the silicone.
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