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11-21-2009, 11:52 PM
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Learning to use the forums
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Join Date: Nov 2009
Posts: 10
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HELP!!! Weird heater problem!
Okay, so when it gets up to operating temperature my heat is slightly warm...if i'm lucky...if i rev it up or just drive it hard it gets to where it normally used to be...it never did this until i replaced the heater control valve...i dont have the vacuum line hooked up to it but it didnt have it on the other one before...so therefore it's always open...no big deal...but i dont get why i dont have any heat unless i rev it up real high...sometimes it will stay and i'll have heat after i do that but usually it just gets cold again...is there air stuck in my heater core or something?
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11-22-2009, 07:10 AM
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Learning to use the forums
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Join Date: Jul 2009
Posts: 12
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I know with my patrol car that happens when I am low on radiator fluid. If I sit in a spot the heater goes cold, once I drive it is hot, I had the radiator topped off by mobile maintenance and it solved the problem.
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11-22-2009, 07:51 AM
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Blinded by the light
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Join Date: Sep 2009
Posts: 7,674
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Thermostat is sticking open. Prevents the coolant from getting warm. Replace it.
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11-22-2009, 09:04 AM
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GO SHARKS
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Join Date: Aug 2009
Posts: 1,523
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heater control valve... you mean the blend door?
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Jay's
09 XL reg cab
L4 2.3 , 40 series flowmaster , tinted windows 5% back 35% sides ,muffler removed from air box mod ,and ac on off switch mod , blinker mod, avs window vent shades
coming soon! k&n drop in/fiberglass bed cover/bed sprayed liner
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11-22-2009, 02:56 PM
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Semper Paratus
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Join Date: May 2009
Posts: 274
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Quote:
Originally Posted by ballistic
I know with my patrol car that happens when I am low on radiator fluid. If I sit in a spot the heater goes cold, once I drive it is hot, I had the radiator topped off by mobile maintenance and it solved the problem.
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^x2 Double check the coolant level before tearing everything apart again. Need to get the any air out of the system.
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'20 Ranger Lariat FX4 Oxford White
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11-22-2009, 11:06 PM
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Learning to use the forums
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Join Date: Nov 2009
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i tried EVERYTHING to get out the air...no the heater control valve...it controls whether heat goes to your heater core or not...i think i still have air stuck back in the SOB...lol....i just put a new thermostat in....no matter how long i drive it it still stays cold unless i really really get on it....like the water pump just forces coolant through the heater core whether it likes it or not!
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11-22-2009, 11:33 PM
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Semper Paratus
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Join Date: May 2009
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Top the radiator off through the radiator cap and then fill up the overflow bottle. Drive it around for a day and allow it to do a couple of thermal cycles to force the air out and draw coolant back in. Also squeeze the upper radiator hose while it is cold and force any air out of it. Hope that helps.
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'20 Ranger Lariat FX4 Oxford White
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11-23-2009, 01:25 AM
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Learning to use the forums
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Join Date: Nov 2009
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Thanks a lot guys...tried to get some help on rangerpowersports...no replys...this site is a lot better! I'll try that
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11-23-2009, 06:36 AM
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Blinded by the light
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Join Date: Sep 2009
Posts: 7,674
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Again, thermostat is sticking open. Prevents the coolant from getting warm. Replace it.
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12-05-2009, 09:10 PM
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Not as smart as I think
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Join Date: Nov 2009
Posts: 258
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I just had this problem on my 2001 Ranger, it was the heater control valve. My mechanic bypassed it and it heats up great! I will need to replace it in the summer. This valve stops the flow to the heater coil when the A/C is activated.
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2001 Ford Ranger with the flare sides. 4x4 with a 4.0 engine. The only thing I did so far is: F/R Brakes, rotors, drums, F/R shocks, tires, bed cap, cone filter, hanger/shackles, F/P wheel bearing, upper control arm, lower ball joint, filler neck, fuel filter and DPFE sensor, muffler, sway bar links and spark plugs! 
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12-07-2009, 02:49 AM
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Learning to use the forums
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Join Date: Nov 2009
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thats what i replaced when it started doing this....but i think it just had a lot of air trapped in the heater core...it's mostly worked its way out now...it still doesnt get as hot as it used to but it gets better day by day!
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02-04-2014, 05:28 PM
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Learning to use the forums
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Join Date: Jan 2014
Posts: 1
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Re: HELP!!! Weird heater problem!
My 2001 Ford Ranger just blows out cold and the temp gage never moves up to comfort level. We have replaced 2 sensors, the heat module, thermastat and have a new heater core. How do we check the vacuum that goes into the heat module?
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02-19-2014, 10:49 AM
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Learning to use the forums
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Join Date: Mar 2012
Posts: 9
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Re: HELP!!! Weird heater problem!
I dont understand the purpose of the HCV.. Mine hasnt worked properly in years. In fact i had to replace it again last weekend because the two plastic ports blew off the back of the dang valve. LITERALLY, the valve blew up! That'll scare the heck out of you when your crusin down the trail and white smoke starts pouring out from under the hood.
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1998 4wd Ford Ranger XLT 4.0L V6 step side. Stock engine, 3'' body lift, 3'' keys and 2.5'' rear blocks, 33" hercules trail diggers/mickey thompson classicIII rims. CB radio/ Pa speaker, front hitch...
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02-19-2014, 03:15 PM
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**************
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Join Date: Aug 2013
Posts: 934
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Re: HELP!!! Weird heater problem!
Quote:
Originally Posted by Ddavis91
Okay,..i dont have the vacuum line hooked up to it but it didnt have it on the other one before...
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Did you try connecting the vacuum line?
I mean you know, Just for giggles & grins?
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Black '98 XLT 4.0 liter, super/extended cab, 4X4, 5 speed manual
*Mods & Pseudo Mods*
Sony head unit, Expo OHC, Uniden CB, 16" Wheels from a 2002 Expo Sport Trac/255-0R16 tires
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