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Old 06-04-2009, 05:03 PM
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Default thermostat replacement,2.3 liter,2002

Hello all,any advice on how to do it,and how do you fill up the cooling system when you are finished? Is there a bleeder valve to prevent air lock? Thanks,Jim
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Old 06-04-2009, 08:12 PM
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Join Date: Jun 2009
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Be sure to get the exact temperature thermostat for your engine. Mine was 192 degrees F. I like to use a small amount of high temperature silicone to seal the gasket surfaces on both sides of the thermostat housing. Be sure to point the thermostat in the correct direction too. Check the hoses and if they are bulging or swollen replace them. I always put a small amount of grease inside the hose to make it slide on more easily.

As far as refilling goes. Here's what I do. I mix the coolant 50/50 with water before pouring it into the radiator. I fill the radiator to the top and fill the coolant reservior to the cold fill line. I start the engine and run it to operating temperature, keep it there for a few minutes to insure the thermostat has opened up and the water is circulating in the system. Let the engine cool down for a few hours, then refill the coolant reservoir to the proper level.

Caution: Don't open the radiator cap after filling the radiator and starting the engine. The water will just come back out due to pressure and expansion. If you plan on opening the radiator sure the engine is completely cold.

Hope this helps ! Good luck
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Old 06-05-2009, 07:30 AM
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Join Date: Feb 2009
Posts: 718

I like the run the truck with the cap off while PARKED to help any air get out
Originally Posted by redrumedge View Post
98blown you should be an MD! that's the same stuff my doc asks and ur spot on man!!!
98 4.0 2wd-----supercharger fully build heads cam...all show with go......3 time world of wheels champ 5 time national winner

lots of ranger parts for sale leftovers from my 94/96
96 sitting on the frame, waiting to go lower

custom billet parts by me intake adapters and billet steps for the step sides

please sign my guestbook!!
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Old 06-06-2009, 12:17 AM
Join Date: May 2009
Posts: 302

hahaha definitely emphasize the fact of having the truck parked hahaha... that be pretty funny to see someone driving down the road with the cap off though :ROFL:
93 ranger ext. cab 4.0L auto 6" SJ/custom lift--37" super swamper truxs M/T tires--lock rite locker w/ 4.56 gears up front--warn hubs--exploder 8.8 w/ disc brakes 4.56 gears and detriot locker--one-piece driveline--bushwacker cut-out flares--Bilstein 5150 shocks--2 10" xcite subs w/ 1600W Crunch amp-- tinted windows

waiting for: dual steering stabilizer, put on 3" body lift(in my room), dual shock setup, electric fan, possible SAS with a waggy D44
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Old 04-25-2011, 12:45 PM
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Default Re: thermostat replacement,2.3 liter,2002

I have a 2002 2.3L DOHC and finally got fed up with the lack of temp control from the thermostat with the electric heater (common to 2001, 2002 and 2003 Rangers with the 4 cyl engines). I replaced it with the non-electric assembly used in 2004+ Rangers and paid ~$30 on Amazon. I saved ~$100 and fooled the computer by adding a 1200 Ohm 1/4 Watt resistor across the two connector leads so it doesn't show shorted or open. There is no CEL and the temperature now heats upo quickly and remains constant on the gauge. The old thermostat had failed: the seal around the valve seat had ripped, the plastic directing the heat had cracked and the electric heater was corroded.
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Old 01-06-2012, 10:03 PM
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Default Re: thermostat replacement,2.3 liter,2002

I have a 2001 ranger 2.3, and i just recently found out how expensive a thermostat is for it, i cant believe you have to get the whole housing and everything, i was hoping that i would be able to convert mine from the elcectronic to just a straight thermostat from a new model ranger... what specifically do i need to do. any help will be greatly appreciated.
Thank you
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Old 01-08-2012, 08:41 AM
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Default Re: thermostat replacement,2.3 liter,2002

Wow! Yes, that's an expensive T-stat!

I buy a lot of parts from Rock Auto, they're most of the time significantly less expensive than the regular auto parts.

I looked on there and even there yours was $120!
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Old 12-23-2013, 07:50 AM
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Default Re: thermostat replacement,2.3 liter,2002

Hoping to resurrect an old thread here....

I too was wondering if there is a video, or a guide to more details on how to convert the standard thermostat to a simpler variety and "fool" the computer.... I have a 2001 2.3L with the same problem, a damn expensive thermostat...

I already flushed the heater core, hoping that might be the culprit, but no luck...
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Old 12-24-2013, 11:08 AM
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Default Re: thermostat replacement,2.3 liter,2002

I think I gave all the information you will need in my earlier post. I now have ~50,000 miles on the cheapo thermostat and everything is still working perfectly and I have passed CA smog in the meantime. Just purchase a later model (2004 or later) thermostat from any supplier and add a resistor across the two pins. You can find a resistor from Radio Shack or online including Amazon. Simple and cheap!
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