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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 12-19-2007
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Thermostat Location

I have a 98 4.0 OHV and...

I'm fixing a few things the previous owner of my truck didn't. My t-stat is stuck open and I was wondering exactly where it is and what all I might have to take off to get to it. A pic would be great.

Then I noticed the antifreeze is almost black! I think it probably has never been changed. How many jugs will I need? I'm gonna use the Prestone 50/50.

I wanna clean the MAF so what is the best spray other than the stuff that made to do it cause my autozone and advance auto parts doesn't have that.

Lastly you should have seen the air filter that was in it! I don't think it was ever changed also. There was SOOOOO much crap in it that the inside of the air box was filling with dirt. I wish I would've taken a picture to show all of you. Needless to say it runs better now with the new filter and I'm sure I'll get better mpgs too.

Thanks!
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Old 12-19-2007
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for the thermostat flow your upper radiator hose at the end of the hose that goes to the engine is your thermostat take that hose off and there it is
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Old 12-19-2007
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Quote:
Originally Posted by mossyoak03
for the thermostat flow your upper radiator hose at the end of the hose that goes to the engine is your thermostat take that hose off and there it is
you got it close.....

follow your upper radiator hose to the engine block. There is 3 bolts that holds the thermostat housing on the block (10mm i believe).

Since you have to drain some of the antifreeze to replace the thermostat, might as well do a complete flush of the cooling system while you are at it.

Tools Needed:
- 3/8" drive ratchet
- 3/8" 10mm socket (don't me to it, but I believe it is this size)
- 3" 3/8" extention
- 3/8" swival socket (not necessary, but makes it easier)
- 5 gallon bucket (to drain anti-freeze)

Parts Needed:
- new thermostat
- 2 gallon anti-freeze (3-4 if you are doing a complete flush and fill)


Steps to Replace:
1. Drain the anti-freeze out of the radiator (this will keep anti-freeze from pouring out the thermostat when you remove it)
2. Remove the intake from the throttle body and lay it out of the way.
3. Take the tention off the drive belt so you can get to all the bolts.
4. Remove those 3 bolts and pop the seal on the housing (no need to remove the hose from the housing).
5. Pop the thermostat out of the block, put a new one in the same way.
6. Re-install the housing and the 3 bolts; do NOT over tighten the housing bolts.
7. Install the drive belt back on the pullies.
8. Fill the radiator up with anti-freeze. If you are doing a complete flush, now is the time to do the flush.
9. Install the intake tube back on the throttle body making sure that all the plugs and vacuum hoses are still attached to the intake tube.
10. Start the truck. Let it warm up to temperature. When it comes up to temperature, shut the truck off let it cool down.
11. Remove the radiator cap and top off the radiator
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Old 12-19-2007
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oh sorry you went into it a lil further than me. hahhahaah
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Old 12-19-2007
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Quote:
Originally Posted by mossyoak03
oh sorry you went into it a lil further than me. hahhahaah
well and you can't just take the hose off.....if you do that, all you will have is the thermostat housing
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Old 12-19-2007
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ya i know just thought he would figure that one out my bad
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Old 12-19-2007
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Quote:
Originally Posted by mossyoak03
ya i know just thought he would figure that one out my bad
its alright.....i never "figure" anything....
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Old 12-19-2007
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guess i should stop doing that to huh
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Old 12-19-2007
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Thanks for the help guys! By the way lifted97 I love your truck, very clean! I'm thinking of getting those same rims also after I crank my t-bars and more money rolls in. Just had a baby and was off work for 2 months so I'm a little broke right now! But thanks alot!!!
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Old 12-19-2007
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not a problem! thanks for the comments...
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