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Old 01-17-2012
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Ranger never seems to warm up?

I have an 89 2.3l ranger that never seems to warm up. The outside temperature is around 30 degrees here but even after driving the truck for about 10 to 15 minutes the temp gauge just barely comes off the C. Also the air from the heater is cold as well. I replaced the coolant and thermostat recently and everything looked ok.

I cant seem to figure out what could cause this, if the heater core wasnt working the gauge would at least read normal. And if the gauge of temperature sensors werent working the air would be hot after a short drive. And the water pump is good and lines are clear or else the truck would be overheating.

Any help or suggestions are appreciated.
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Old 01-17-2012
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If you have enough coolant, the only thing I can think of is that your thermostat is stuck open.
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Old 01-17-2012
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Which is what I thought too. But after replacing that and having the same exact problem it leads me to believe its something else im missing.
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Old 01-17-2012
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My friend just replaced the thermostat on his Mazda 2.3L(05) and it didn't help his.He's having the same problem.
I feel bad because I suggested that is what it was but ,then again I changed it for him.That's what friends are for.
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Old 01-17-2012
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Its nice to know im not alone with this problem. Let me know if he figures anything out.
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Old 01-17-2012
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Pull the thermostat out and put it in some boiling water on the stove. If you don't have a thermometer that reads high enough, watch for the little bubbles and see if it stays shut or open even to the point of boiling.

If your gauge is wrong (temp) see if your radiator hoses are getting warm. If they are, then there may be a valve that controls water to the heater core. If no valve, your heater core may be plugged up. I recommend a flush and then refill with new anti-freeze.

I really do help you find out what it is. When you do, please post it just in case someone else runs into this problem.
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Old 01-17-2012
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Thanks for the tips. Ill try pulling it out this weekend and see what it does. I know its rated for 195 which is what the truck needs but ill test it either way. Also another question, If I have a line plugged up or the pump is not working to its full potential would the temp gauge read high or low? Im not sure where they are positioned on the motor and if they read the coolant or actual engine. If they read coolant only I would make a guess that i have a plugged line or pump. If they read actual engine temp I really dont know whats wrong.

Thanks again!

Last edited by RangerDanger89; 01-17-2012 at 12:39 PM.
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Old 01-21-2012
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Something about Rangers and thermostats. I put two in my truck recently and the second one worked. One other thing, make sure the thermostat is pushed back and seated well in the housing. If the housing is not clean and the thermostat not seated all the way back, water will seep around the thermostat.
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Old 01-21-2012
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its a 4 banger it takes time to get warm
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Old 01-21-2012
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Definitely check for trash in the system. If a line was plugged it would get hot because the coolant isn't circulating. Sounds a lit like a stuck thermostat
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Old 01-25-2012
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Im gonna go with water pump. Impellers could be rotted off and just has enough force to keep engine "cool". The temp sensors are inline with the heater core circuit, so if the water pump is too week to push coolant through the heater core, the coolant becomes stagnant, thus not much of a temp increase.
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Old 02-11-2012
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I have a 94 b2300 with 220k +, my temp guage has never worked right. It barely reads above C when warm. A couple months ago my heater stopped blowing warm air, and my engine began over heating when idling. I bought a new thermostat, but decided to try flushing my radiator first when I saw what a pain the *** it was to get to the thermostat. Now my heater blows hot again, and my truck stopped over heating.
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Old 02-11-2012
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I'm also having a similar problem to a degree. my temp guage is not reading right most of the time. it takes a while for it to warm up via the guage though it is about thirty or below out side but even before it got cold it took a while. but the heat blows warm. I'll be driving and eventually it goes up but when I gas it a little whilst driving it will drop and take a while to rise to normal. I have a new water pump newer antifreeze the hoses get warm, nothing over heats still drives fine just worried about the fluctuating temp guage.
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Old 11-29-2013
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My 99 XLT 4.0 temperature gauge has stopped working. Check engine light came on. Diagnostic said to replace engine coolant sensor. Now the heater is starting to blow warm air but not hot air. Could it be the thermostat
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Old 11-29-2013
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I have the same issue with my Ranger. It will warm up but as soon as I start moving and air flows over the rad it cools right down to COLD.
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