Heater Core busted can i bypass it

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  #1  
Old 04-06-07, 10:25 AM
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Question Heater Core busted can i bypass it

I have a 1996 Ford Ranger XLT shortbed 2.3 L 4 cyl. I am currently having problems with my heater core by this i mean it is going out. Is it possible to bypass it without harming my engine. And/ Or what is the function of the heater core ?
 
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Old 04-06-07, 10:30 AM
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The heater core is what gives you heat and defrost in the cab of your truck. Pretty much a small radiator.

You can bi-pass it by simply removing 1 of the heater hoses and looping the other between where it comes off the water pump and connecting it where you removed the other one from the engine.

This means you'll have no heat or windshield defrost in the cab of your truck untill you replace the heater core.
 
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Old 04-06-07, 04:35 PM
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How do you know the core is bad? Is it leaking? If it is NOT leaking, I suggest doing a good flush of the system.

Disconnect both the heater core hoses coming out the firewall and stick a garden hose in one end to flush it out. This usually clears problems up.

If the water flows freely through the core, then you have a blend door problem in your airbox.
 
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Old 04-09-07, 11:30 AM
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Heater Core

Is this universal advice? I have a 68 Dodge Dart; while driving over the weekend, coolant started dripping into the front passenger footwell. I found the 2 hoses that lead into the firewall but since this is the 1st classic I've had, I wanna make sure I'm not screwing anything up before I alter it.
Also, anyone know of a site or book that has all the parts under the hood listed as to what they are? I know the basics like alt, distrib cap, carb, etc. But there's some smaller things that Chiltons and Haines don't display in their diagrams.
 
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Old 04-09-07, 11:46 AM
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Yes this should work for all cars and trucks. Basically you are bypassing the heating system. The heater fan will still work - just no heat. The heater core is a minature radiator so if the entire cooling system isn't up to par it may run a little warmer - usually nothing to be concerned with.

The haynes manual should show everything. Towards the back of the manual there are wiring diagrams that should list what the engine page doesn't cover.
Is there something in particular you need to identify?
 
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Old 04-09-07, 11:58 AM
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There's 2 hoses coming out of the firewall for the heater core. The left hose, I assume this is the out going coolant from the core, leads into a black circular thing (it looks like a vertical flying saucer about 5" in diameter). From that thing, I don't have the car in front of me so I'm going by memory of what I looked at over the weekend, there were 2 smaller/thinner metal hoses leading down towards the bottom of the engine compartment (they kinda look like crazy straws since they're twisted as they go down).
I don't know if this helps, but the car had A/C but doesn't have a compressor.
I wanted to know what that was so I know if I should also bypass that when I bypass the heater core or if I should keep it in the loop.
 
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Old 04-09-07, 12:11 PM
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I don't remember exactly how AC interacts with the heater but the 2 hoses that come out of the heater core should both terminate at the engine. Disconnect either one from the motor and just make a loop with 1 hose the coolant goes directly from 1 outlet to the other.

AC systems are under pressure and you can't simply unhook them without loosing the freon but since there is no compressor the system should be dead.

The heater hoses are somewhat flexable and are connected with hose clamps. AC lines have a threaded fitting.
 
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Old 04-09-07, 12:19 PM
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If I can figure out how to add pictures to my posts, it might be easier than me trying to explain the part, but the posting rules say I can't add attachments. Anyway, with your description of AC lines, that sounds like what I'm talking about. Can that be bypassed as well when I bypass the core or should it stay in the coolant loop?
 
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Old 04-09-07, 12:59 PM
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No need to bypass the AC since it isn't operational - you can remove it if you desire. The heater works off of engine coolant, the AC works off a gas - they are totally seperate of each other.

Photos can be supplied thru sites like photobucket.com. I'm not very pc literate but basically you supply the photo thru them and then provide the link in your post.

btw - welcome top the diy forums!
 
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Old 04-09-07, 01:12 PM
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One last set of questions (please pardon the ignorance of it but I just wanna make sure), do I need to drain the coolant system before I do the bypass? Since the core hoses are kinda high on the firewall, I didn't know if gravity would keep the cooled coolant level below where the hoses would be unhooked.
If I do need to drain it, I assume that's done at the bottom of the radiator.
Thanks for the welcome and advice.
 
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Old 04-09-07, 03:06 PM
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I took some pix of that part I was telling you about and stored them on photobucket.

http://s170.photobucket.com/albums/u279/in2theknight/Dart/

I put a red circle around the part. You can see in the 001 and 002 pix where the hoses comes out of the firewall into the part. I haven't seen that listed in my Haines book.
 
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Old 04-09-07, 03:12 PM
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Bypass

The part is the vacuum control valve that allows water to circulate through the heater core and provide heat to the interior of the car.
 

Last edited by jmm706; 04-09-07 at 03:32 PM.
  #13  
Old 04-09-07, 04:25 PM
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No need to drain any coolant. You will lose a little [depending on how slow/quick you are] so be sure to check the coolant level when you are done.
 
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Old 04-09-07, 05:51 PM
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Did you get a chance to look at those pix I took and posted at
http://s170.photobucket.com/albums/u279/in2theknight/Dart/
Any idea what that part is circled in red?
 
  #15  
Old 04-09-07, 07:01 PM
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Pretty sure it's the heater control valve.

You don't want that old Dart do you ? I'll come take it off your hands for you. Looks like it sports a V8. Does the rest look as good as the little we've seen??
 
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Old 04-09-07, 08:28 PM
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Cool

Yup, 340 V8.
I try to stay humble when people talk about how the car looks so I'll let you judge that for yourself...



 
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Old 04-10-07, 05:42 AM
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That's really nice. Do you get to have the top down much in Seattle ?
 
  #18  
Old 04-10-07, 08:26 AM
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Not over the winter but the spring and summer will get less rainy days so I'll open it up more. Last wkend was great so I droped the top and took a ferry ride to some of the islands around here.
 
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