Ranger heater problem


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Old 02-24-07, 08:13 AM
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Ranger heater problem

1994 Ranger with a six cylinder.

The temperature gauge goes up and down about 30 to 40 degrees so I replaced the thermostat and it still does it. Plenty of fluid and the radiator cap works fine. I removed the cap and looked at the water flow and in my opinion it wasn't very impressive but was circulating. The heater hose going to the heater was hot but the one coming back wasn't.

Then a strange thing happened. I drove it and there was a little heat coming out and I came to a stop, floored it to 65 mph and now there's absolutely no heat at all!!!!

The previous owner hasn't recently changed the fluid so I'll fllush it and see what happens.

I pulled out the ash tray and inspected the control lever and it is fine but I can't see the valve it's connected to because it's underneath the dash.

Any ideas would be heplful.

Thanks!!
 
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Old 02-24-07, 08:16 AM
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Your heater core is clogged.

BOTH hoses going in and out of the firewall should be hot at all times.

If one is hot, the other cool, it means the core is clogged.

Disconnect those two hoses from the engine side and stick a garden hose in either end and flush it out.
 
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Old 02-24-07, 08:36 AM
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Dunno on a ranger so i guess ill ask if the heater hose has a control valve. Seen this on S10s before
 
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Old 02-24-07, 10:03 AM
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Boomers,

If the the heater control valve was broke, if it has one, BOTH hoses would be cold.
 
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Old 02-24-07, 11:23 AM
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Originally Posted by HotinOKC View Post
Boomers,

If the the heater control valve was broke, if it has one, BOTH hoses would be cold.

Oh, the damn ASE, so they call themselves, mechanics at the dealership say they knew when the flow control valve was bad when the one that lead up to the valve was hot and the one "going out" was "cold". I better let them know both should be cold.
 
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Old 02-24-07, 11:31 AM
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Boomers,
The hose will be hot leading up to the valve is correct, but, the way the poster was saying, the hose going into the firewall which is after the valve was hot, the other was not.
 
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Old 02-24-07, 11:45 AM
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Thanks, Mark....It's great now!
 
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Old 02-24-07, 01:37 PM
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Originally Posted by Chucktkd View Post
Thanks, Mark....It's great now!
Did you actually flush it and did you hose it through one line or did you do it both ways??
 
 

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