Heater core back flush question
01-30-2014, 07:24 AM
#1
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Year: 1996
Model: Cherokee
Engine: 4.0
Heater core back flush question
Howdy everyone,
Since it's going to feel like summer this weekend (it's going to hit 46 degrees!), I'm going to back flush the heater core. I found some videos on YouTube; it looks simple enough. I know I remove the upper hose on the t-stat housing and the hose that's the same size connected a little further back on the engine. My question is, which hose do I put the garden hose in? The one from the t-stat housing or the other hose?
Thanks
Since it's going to feel like summer this weekend (it's going to hit 46 degrees!), I'm going to back flush the heater core. I found some videos on YouTube; it looks simple enough. I know I remove the upper hose on the t-stat housing and the hose that's the same size connected a little further back on the engine. My question is, which hose do I put the garden hose in? The one from the t-stat housing or the other hose?
Thanks
01-30-2014, 07:32 AM
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Year: 2000
Model: Cherokee
Engine: 4.0 I6
Howdy everyone,
Since it's going to feel like summer this weekend (it's going to hit 46 degrees!), I'm going to back flush the heater core. I found some videos on YouTube; it looks simple enough. I know I remove the upper hose on the t-stat housing and the hose that's the same size connected a little further back on the engine. My question is, which hose do I put the garden hose in? The one from the t-stat housing or the other hose?
Thanks
Since it's going to feel like summer this weekend (it's going to hit 46 degrees!), I'm going to back flush the heater core. I found some videos on YouTube; it looks simple enough. I know I remove the upper hose on the t-stat housing and the hose that's the same size connected a little further back on the engine. My question is, which hose do I put the garden hose in? The one from the t-stat housing or the other hose?
Thanks
01-30-2014, 08:52 AM
#3
CF Veteran
If you look closely, you will see that both heater hoses have differetn diameters.
The larger one in the heater inlet, the other the outlet.
For reverse flushing (you want the crud flushed out, not further in), put the garden hose in the smaller one. Flush till clean water comes out, than put the garden hose in the other one, repeat a few times till happy.
The larger one in the heater inlet, the other the outlet.
For reverse flushing (you want the crud flushed out, not further in), put the garden hose in the smaller one. Flush till clean water comes out, than put the garden hose in the other one, repeat a few times till happy.
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Dave Maloney (08-17-2023)
10-21-2016, 03:06 PM
#7
hi, I have no heat in my jeep and i have never flushed it. can someone list exactly what i need to do to backflush my heater core? Do I still flush my radiator since I just changed out the whole thing this last spring? Also what is a heater control valve?
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10-21-2016, 03:36 PM
#9
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Year: 1999
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You're probably low on coolant. Top off your radiator and overflow tank and see if that helps. The heater control valve opens to let coolant in the heater core when you turn your heat on. Back flushing your heater core is just running water through it in the opposite direction coolant normally runs. It gets all the gunk out.
10-21-2016, 07:51 PM
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Year: 2000 and 1998
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be careful not to apply full pressure or you can blow the core. use a "leaky connection at least to start ,. if its plugged bad you may blow it.
use a slow flow to start.
i used a piece of plastic water pipe to couple the hoses, 1/2 in
use a slow flow to start.
i used a piece of plastic water pipe to couple the hoses, 1/2 in
Last edited by nujeepguy; 10-21-2016 at 07:54 PM.
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