Question about 2002 Ford Ranger Regular Cab

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HEATER ISN'T BLOWING HOT AIR

IN LINE HOSE VALVE IS OPERATABLE AND IN HOSE IS HOT BUT OUT HOSE IS COOL

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Sounds like a restricted heater core. Remove the hoses and back-flush the heater core system with a water hose. You may want to do a complete cooling system flush while you're at it.

If you can't flush the heater core clean with a water hose, it may be time to replace.

Posted on Jan 06, 2013

  • 3 more comments 
  • Tim Sharpe Jan 06, 2013

    I was thinking that and thanks for the 2nd opinion. Another question I had was the blend door. It is cable operated and from the looks of it it seems to be opening and closing all the way. Is the heat controled ONLY by the in-line hose valve?

  • wrenchmon574
    wrenchmon574 Jan 06, 2013

    The heat flow through the core is controlled by the in-line hose valve. If you're getting hot water to one side of the core, but not the other, it's almost certainly the core (POSSIBLY the output hose, but unlikely. Worth flushing the hoses both directions as well, just to be sure, but 99 times out of a hundred, it's the core. If you had heat to both sides of the core, but no heat out the vents, it would probably be a blend door.

  • Tim Sharpe Jan 06, 2013

    Thanks much for the help. I'll flush the core both ways first. I really don't want to pull the core out. Thanks again

  • Tim Sharpe Feb 05, 2013

    Did what you suggested and flushing did the trick. Sorry it took me so long to reply.

  • wrenchmon574
    wrenchmon574 Mar 02, 2015

    Terrible advice. Don't run 100% antifreeze that doesn't get very cold OR very warm. Most jugs of antifreeze will have a chart that indicates ratios that are safe for specific temp ranges. 100% antifreeze will actually freeze at a much warmer temp than a strong mix. 100% antifreeze can freeze at 10 degrees F. as compared to doing 70% antifreeze and 30% water bringing the freezing point down to an incredible -72F!

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Try flushing or blowing high pressure air through the heater core lines. its sludge build up and need to be flushed through heater core only. check antifreeze fluid level. only put in straight antifreeze, do not mix. most people do not know what mixture should be, so be safe and add straight, it will not hurt it, i run 100% straight antifreeze and never had a problem or worry about it ever freezing and cracking my block, heads or radiator cracking.

Posted on Mar 02, 2015

  • 2 more comments 
  • wrenchmon574
    wrenchmon574 Mar 02, 2015

    Terrible advice. Don't run 100% antifreeze that doesn't get very cold OR very warm. Most jugs of antifreeze will have a chart that indicates ratios that are safe for specific temp ranges. 100% antifreeze will actually freeze at a much warmer temp than a strong mix. 100% antifreeze can freeze at 10 degrees F. as compared to doing 70% antifreeze and 30% water bringing the freezing point down to an incredible -72F!

  • wrenchmon574
    wrenchmon574 Mar 02, 2015

    Terrible advice. Don't run 100% antifreeze unless you're in a climate that doesn't get very cold OR very warm. Most jugs of antifreeze will have a chart that indicates ratios that are safe for specific temp ranges. 100% antifreeze will actually freeze at a much warmer temp than a strong mix. 100% antifreeze can freeze at 10 degrees F. as compared to doing 70% antifreeze and 30% water bringing the freezing point down to an incredible -72F! The cooling efficiency of 100% antifreeze is also terrible, so in hotter climates, or during summer months, it's going to suck at that too.

  • wrenchmon574
    wrenchmon574 Mar 02, 2015

    Terrible advice. Don't run 100% antifreeze unless you're in a climate that doesn't get very cold OR very warm. Most jugs of antifreeze will have a chart that indicates ratios that are safe for specific temp ranges. 100% antifreeze will actually freeze at a much warmer temp than a strong mix. 100% antifreeze can freeze at 10 degrees F. as compared to doing 70% antifreeze and 30% water bringing the freezing point down to an incredible -72F! The cooling efficiency of 100% antifreeze is also terrible, so in hotter climates, or during summer months, it's going to suck at that too.

  • Jay Strukel
    Jay Strukel Mar 02, 2015

    100% antifreeze is just fine, do not listen to idiots that say its not ok to run 100% antifreeze, they are book mechanics and do not know what antifreeze is~!

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