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  #1  
Old 10-12-2009, 02:42 AM
bultacco40 bultacco40 is offline
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Default Over cooling problem

Hello all...It's good to be here...I'm not sure where to post my question so I hope I'm doing this right. I have a 1994 Ford Ranger, 2.3L, 2wd. I've noticed lately that it's been running a lot cooler temperaturewise lately. It takes a while to warm up to about the "N" in Normal, then when the stat opens, it quickly goes down to a little above Cold. Top hose is warm bottom hose is almost cold.I do have some heat but not nice and hot. First thing I did was to change the t-stat. Same thing happens, I figured maybe I got a little RTV in there so I changed it again, same thing happens. The next week I changed the Water pump, radiator, rad cap, and hoses and both sending units, and fan clutch. Same thing happens, still runs cold. I then tied off the fan with some string to keep it from moving and it warmed up nicely and the heat was great. I let it warm up to about three quarters the way up the gauge before I untied the fan,cooled right back down to a little above the "C". Thanks for any advice!
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  #2  
Old 10-12-2009, 07:19 PM
Clem Clem is offline
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This is strange, most of us are worried about over heating, yours is backwards.
I have read your post at least 6 times, and I am stumped.
Is there anything you might have left out?
How cold is it where you are?
This suggestion is going to sound a bit strange, get a piece of cardboard that will cover the grill in front of the radiator. Drive it that way for a while and watch your temp gauge.
If the temp rises and keeps going up, stop and cut a hole in the center of the cardboard, continue doing that until the temp is where you want it to be.
Another thought, you bought this truck used, correct, how many cores are there in the radiator? Normal now is generally 1, however you can get radiators with 4 cores, the 4 core will be about 3 inches thick. If you have a 4 core radiator,that is probably your problem.
The next question would have to be why you would have a radiator like that, they are for towing purposes mostly.
Look at the radiator, then put the cardboard in place and see what happens.
Post what you find here so we know where you are going next.

Ray
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  #3  
Old 10-13-2009, 02:54 PM
bultacco40 bultacco40 is offline
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Thanks for your input Ray, I did try a piece of cardboard and the thing still ran cold. Someone today mentioned the heater core also, they said that there may be some kind of a shut off valve that closes the flow to the core and it may not be working. When I got home today, just for the heck of it I pinched off the supply hose to the core and sure enough the temp gauge rose right up. When I let it go (C-clamp and two thin pieces of wood) the temp fell right back to cold (the first line after "C"). hmmm...interesting. I am going to look into the function of the core right now and see what I come up with. One thing I do know is this truck was running right about in the middle of the temp gauge when I got it. Right now the outside temp in the morning is around 40 and warms up to 50's. I live in Rhode Island. I like the cardboard test and also someone mentioned getting rid of the fan and fan clutch assembly and installing an electric fan with a toggle switch on the dash. I will let you and anyone else who is interested (and I know I'm not the only one with this problem..lol) know how I make out. I must say, out of all the work I've done with cars and motors, this one has me going nuts. To think I may have overlooked something like a simple valve to make it all well again...Well I hope I did! Thank you again
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  #4  
Old 10-13-2009, 03:43 PM
modelageek modelageek is offline
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Replace the thermostat with the correct "motorcraft" thermostat. Make sure it is in the correct direction and that it is is seated properly in the outlet houseing....... I bet you did not replace it with a a motorcraft i think it MC f8cz-8575-aa but check
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2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #5  
Old 10-13-2009, 03:59 PM
modelageek modelageek is offline
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if the thermostat is correctly installed and it is working and it is the correct thermostat and the engine doesn't heat up .......I am not sure what else it could be maybe a blown headgasket.... I am betting on the wrong t-stat or improper install .keep us posted
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #6  
Old 10-13-2009, 04:21 PM
Clem Clem is offline
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Did you have the heater hoses off before you started having this problem?
For some reason (I don't understand, but it is fact) if you reverse the heater hoses, you do not get good heating in the cab.
But I don't remember it affecting the temperature of the engine like you have. When you choked off the flow though, it warmed up to where it was supposed to.
This is getting better with each reply.
I thought maybe you lived in the north country where the temp has been falling like a brick over the last week or so.
Let us know what happens now.


Ray
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K&N CAI 77-2529KP
Jet Chip
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“If you do not know where you are going, every road will get you nowhere.”
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  #7  
Old 10-13-2009, 06:55 PM
Clem Clem is offline
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I think you and adrenalinemotion have something in common, why don' you read his post
http://www.fordrangerforum.com/6-cyl...ctuations.html
I am going to refer him to you also.

Ray
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White 2002 Ranger XLT Extended Cab 4.0 4x4 4.10 LS
5 spd,/BW1354e
K&N CAI 77-2529KP
Jet Chip
2 1/4" Exhaust
Explorer Dome Light
IN THE WORKS:
Sable Electric Fan


“If you do not know where you are going, every road will get you nowhere.”
—Henry Kissinger
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  #8  
Old 10-15-2009, 01:52 PM
bultacco40 bultacco40 is offline
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Thanks again for your help. What I've done for now is squeezed off about half the flow going into the core via the heater hose. I'm getting good heat and a steady reading on the gauge. I'm also getting better coolant pressure and bottom hose is now nice and warm instead of cold. I haven't gotten into how my heater core system works yet, as far as switches or doors and things. I know this is not a permanant fix, but it will do for now till this weekend. I will def. keep this thread posted on my findings. I'm sure once I see how this whole system operates, it won't be such a mystery anymore. Well at least she's got a new rad, rad cap, fan clutch, two sensors, hoses, serpentine belt, thermostat, flushed, new coolant, and water pump. lol....
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  #9  
Old 10-15-2009, 02:02 PM
modelageek modelageek is offline
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What brand t-stat did you use and are you sure it was installed properly
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #10  
Old 10-15-2009, 02:12 PM
modelageek modelageek is offline
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Scraching my head. With all that work you did I wish it would work without squeezing the hose off. I am not sure about what valve you are talking about. Your truck should warm up and you should get heat without blocking anything off. I am still going with something is wrong wirh the t-stat
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #11  
Old 10-25-2009, 10:20 AM
bultacco40 bultacco40 is offline
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Thank you everybody! I am going to pick up a Motocraft thermostat and try it again. Since my last post I disconnected the two hoses to the heater core on the firewall and looped them. I figured If I eliminated the heater core entirely and if the truck still did the same thing, then I can eliminate the heater core being the issue. Well the truck ran the same way with the hoses looped. I will chance the t-stat with a Ford motocraft one and let you know how I make out. Thanks again!
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  #12  
Old 10-25-2009, 12:58 PM
blueovelboy blueovelboy is offline
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glad you posted this thread i to am having a similar problem with mine no heat and she runs cold? have an appointment to get it looked at on Monday at the stealership due to its only got 1847 on the clock and warranty is still fresh ink might as well use it lol
all the boys at mvft ( mission valley fort trucks ) are good friends with me and if thay find any thing out ill pass it on!
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  #13  
Old 10-25-2009, 01:08 PM
modelageek modelageek is offline
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keep us posted , it is probably a bad tstat
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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  #14  
Old 10-25-2009, 02:47 PM
FireRanger FireRanger is offline
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The heater core does not transfer anywhere close to enough heat to be the cause of this or any other over-cooling type problems. The thermostat is basically the only thing that can and will cause the engine to not warm up and rapidly cool off like that.
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  #15  
Old 10-27-2009, 06:00 PM
pepper809 pepper809 is offline
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Default Mine FUBAR too

I have a 1999 Ranger 2WD 2.5L 4 cyl and I have a similar problem. The lower hose does not heat up, the top part of the radiator is warm and the bottom is cool, I have heat, and the temp guage fluctuates between the midway mark to the lower portion of the normal range. I backflushed the system, replaced the T-stat to no avail. Let me know what you find out.

Mike
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