94 heater core change

94 heater core change

Postby alexalexanders [OP] » December 22nd 2010, 2:25am

How hard is this to do? Is there a write up on this? A friend gave me a heater core that new had left over from his van, and mines needs flushed so i was just gonna replace it instead since i have a brand new one. Btw its the front heater core on a no rear air van.
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Re: 94 heater core change

Postby Phantom » December 22nd 2010, 3:17am

Try the search function , I remember someone giving instruction on this , like a panel on the right side that comes down making it easy
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Re: 94 heater core change

Postby offroad safari » December 22nd 2010, 3:36am

i did it on my 90 safari, it took about 30 minutes. remove the glove box, remove the black cover near the passenger's footwell, unbolt the heater core, remove the hoses and pull out the heater core. then reverse the process. the bigger problem is getting the air pocket out of the heater core.
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Re: 94 heater core change

Postby alexalexanders [OP] » December 22nd 2010, 4:01am

Uhhh...dumb question but what do you mean about air pocket?
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Re: 94 heater core change

Postby offroad safari » December 22nd 2010, 4:12am

I have found that when the cooling system is drained or taken apart in this case, air tends to get trapped in the heater core because its the highest part of the cooling system.
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Re: 94 heater core change

Postby gtkane » December 22nd 2010, 4:18am

If it just needs to be flushed, why don't you just flush it?
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Re: 94 heater core change

Postby alexalexanders [OP] » December 22nd 2010, 4:47am

gtkane wrote:If it just needs to be flushed, why don't you just flush it?


Well i havent decided for sure which ill do, i was thinkin if it was a super easy fix, id just throw the new heater core in but it seems that a flush would just be easier and to just keep the new core to replace later if it need/when it needs it.
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Re: 94 heater core change

Postby fast68 » December 26th 2010, 8:38am

make sure heater control valve isnt stuck, under hoods in heater hose

or blend door isnt stuck or broken, inside heater box under dash


both will cause low or no heat

when engine is hot are both core hoses same temp, both hot?

if not then core is plugged or valve is stuck shut

if are both hot then core is not plugged and valve is not stuck shut

door in box stuck or control panel not changing positions, check vacuum source from engine to control panel assembly, black small hose line
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