Ranger heater

Tiny
RGPARKER
  • MEMBER
  • 1994 FORD RANGER
  • 6 CYL
  • 2WD
  • MANUAL
  • 200,000 MILES
Dear 2Pros,
I have a 1994 Ranger 3.0L w/AC with low heater output. Fan blows fine. Rad is full. Top rad hose is hot. Temp gauge reads normal. I blew out heater core both ways, no blockage there. Prior to blow out, heater hoses were cold at core and no heat in cab. After, one is hot and only luke warm air in cab. My body shop friend thinks it's a problem with an electrical switch behind the dash.
Suggestions?
Thanks,
Bob
rgparker@wcnet. Org
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Tuesday, December 14th, 2010 AT 7:55 PM

15 Replies

Tiny
RASMATAZ
  • MEMBER
Check and test the air blend door/actuator
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Tuesday, December 14th, 2010 AT 8:09 PM
Tiny
RGPARKER
  • MEMBER
I have yet to buy a manual.
Please lay out the check/test for blend door.
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+1
Tuesday, December 14th, 2010 AT 8:34 PM
Tiny
RGPARKER
  • MEMBER
Prceedure?
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Tuesday, December 14th, 2010 AT 8:42 PM
Tiny
RGPARKER
  • MEMBER
I am not receiving/seeing your reply.
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Tuesday, December 14th, 2010 AT 8:48 PM
Tiny
RASMATAZ
  • MEMBER
You'll be needing a repair manual to show you how to get behind the dash to get to all the mode/blend/recir doors to check its functions could very well be the HVAC control module itself-If you haven't done such work I suggest you bring it in-it can get complicated and also time consuming

with low heater output

Did you meant not hot enough if so have your replace the thermostat if so-Time to open it up and investigate or bring it in
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Tuesday, December 14th, 2010 AT 9:16 PM
Tiny
RGPARKER
  • MEMBER
Thanks.
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Tuesday, December 14th, 2010 AT 9:20 PM
Tiny
WRENCHTECH
  • EXPERT
Everything you are describing indicates a plugged up heater core. It may appear clear when flushing but not be. These are bypass type cores so you can have as much as 80% restriction and still appear clear when flushing. The slight improvement you experienced reinforces that theory.
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Saturday, December 18th, 2010 AT 1:39 PM
Tiny
RGPARKER
  • MEMBER
Thank you for the additiional review and reply.
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Saturday, December 18th, 2010 AT 3:27 PM
Tiny
FIXITMR
  • MEMBER
So the trucks with have a heater cor
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Sunday, December 26th, 2010 AT 6:59 AM
Tiny
FIXITMR
  • MEMBER
So the trucks have a heater core bypass (hose) like the cars? Find it and pinch it off is the answer! This will force all coolant thru core resulting in good heat?
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Sunday, December 26th, 2010 AT 7:03 AM
Tiny
WRENCHTECH
  • EXPERT
I don't know what the previous expert is referring to but there is nothing like a "bypass" hose for the heater core. There is an "in" hose and an "out" hose to the heater core and the system is bypass in nature as nothing is "forced" through the core. If it's clear, it will flow, otherwise it will not.
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Sunday, December 26th, 2010 AT 12:44 PM
Tiny
FIXITMR
  • MEMBER
The 99 up taurus actually has a bypass HOSE for some reason? I thought when the 'bypass type' was mentioned that maybe other fords had this system in place? Of course why they use it at all is a mystery to me?
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Sunday, December 26th, 2010 AT 7:45 PM
Tiny
WRENCHTECH
  • EXPERT
I'm not sure what your seeing but here is the layout for a 99 Taurus and there is not bypass nor have I ever seen a system set up with one. There would be no reason for it.

https://www.2carpros.com/images/external/78046836.gif
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Sunday, December 26th, 2010 AT 7:53 PM
Tiny
FIXITMR
  • MEMBER
Here's what i'm referring to. Its from a 2000 taurus.
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Monday, December 27th, 2010 AT 7:28 PM
Tiny
WRENCHTECH
  • EXPERT
Closing out question
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Monday, March 28th, 2011 AT 6:47 PM

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