Ranger Operating Temp and Thermostat Question - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 04-04-2012
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Ranger Operating Temp and Thermostat Question

My truck has had a few problems since i've started driving it again after a long winter! First was the clutch issue, which i just had fixed..and now i've noticed i have no heat!

So heres my questions..can anybody with a scangauge tell me what their normal operating temp is on their ranger..i have an 08 2wd xl...im sure they all run about the same temp anyways. Im running at 81 degrees celsius which is about 177 degrees F

This will help me realize if the truck is not getting hot enough..then i can try swapping out the thermostat. I've also read about the heater blend door being a common problem, but thats more so for the older rangers. I doubt its the heater core..and i havent checked the hoses under the hood to see if they're getting hot. Over the winter i would start the truck up every few days and run it...and just about a week ago i started up the ranger and ran the heat on full blast since we had some frost in the morning. Everything was working then..so i dont know what the issue could be! Any help would be appreciated!
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Old 04-04-2012
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Average is 192ish on my truck. You may hit 200s every once in a while, I hit 212 and then it instantly dropped to 185 when the thermostat opened and back to 190 range

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Old 04-04-2012
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I would definitely check your hoses first since you said that you haven't. On the day that you ran it with the heater full blast, did you drive it? If not, it could take a while to get warmed up. You could do a flush on your system and see if you get any debris to come loose.
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Old 04-04-2012
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Check the themorstat. My truck took a lot to reach regular operating temperature. Turns out the themorstat on my truck was stuck open. I removed it from its housing and sanded it down with some sand paper and a wire brush, and it has worked fine since. That was 3 years ago. I did flush the coolant while fixing the thermostat. Just my .02 cents.

Last edited by 03crewcabranger; 04-04-2012 at 02:58 PM. Reason: Wrote some stuff wrong...
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Old 04-04-2012
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Mine usually runs right aroun 190. sometimes will jump to 194.

but pedro/jim/bob/doug and I have the 4.0 so not totally applicable here...
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Old 04-04-2012
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So I just drove the truck for about 45 minutes. The truck hits ~180F on average..I'm thinking that's about right for the 4 banger. The temp gauge shows just about half..so I think the thermostat isn't the issue. I touched the hoses leading into the cab after the 45 minute drive..and they were both hot. Hopefully the issue is minor and not the heater core. Can anybody elaborate on what the issue might be??
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Old 04-04-2012
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Coolant test good? Cap? any leaks?
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Old 04-05-2012
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Everything's good. I'm thinking blend door. Anybody deal with this on a newer ranger??
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Old 04-05-2012
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You might need to flush your antifreeze. but if both hoses were hot coming out of the heater core, then it seems like heat is getting into the cab.
So i second the blend door. Start with the switch however, to rule that out. Make sure all options work on your *****, (heat and cold, vent, defrost..etc) just to make sure you just don't have a bad Hvac panel.
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Old 04-05-2012
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the whole hvac panel works....although when i switch from hot to cold i dont hear any motorized sound coming from under the glove box..kinda like when you switch from floor heat to upper vents..you hear a motorized sound. im gonna give it a look tomorrow morning and see what it is.
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  #11  
Old 04-06-2012
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Well..I thought it was the blend door but after cutting a hole I see that the blend door works!


That's a video of the door working.


So...door works...hoses going into cab are hot..could it be the core? Or possibly the t-stat? Maybe the hoses are not hot enough???
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Old 04-07-2012
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Bump
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Old 04-07-2012
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Could try and flush maybe somethings came through and gotten stuck, I was gunna say blend door until I saw your other post as thats the same issue I'm having with mine only vise versa, hot not cold
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Old 04-09-2012
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so this morning all of the sudden the heat started pumping out...and then this afternoon when i drove home after classes...no more heat. Does this sound like something stuck in the rad/heater hoses? I just want to have a clue before i start flushing the system. I dont want to do it if i dont have to. im still leaning towards tstat...i just havent had any time to take the tstat out and test it!
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