goblinish15

Any pics, diagrams, or examples? help! haha i gotta get my heater to heat up faster so i gotta flush it and clean it. Its always cold here so i gotta get this done!

1987XJ

there on the firewall on the passenger side

goblinish15

Where is the firewall?!?!

Abovetimberline

Here this should help,this is a pic of an 99 so there is no heaater control valve,but the 2 rubber hoses is where they are at on the firewall.

goblinish15

So where abouts is the hose that i want to clean out?

Abovetimberline

Just follow the hose from the water pump to the firewall,the hoses ar the only ones going through the firewall,they are the black rubber ones next to the brass block,that block is for your ac.
The 2 with the red kines are to and from the heater core. If you disconnect those,cold of course and use a garden hose and make sure you have flow through the heater core.

goblinish15

you are talking bout the ones i have my hands on in this pic? k sweet. So do you think that will help heat my jeep faster if i clean it out?

5-90

Your entire cooling system may benefit from a flush. If it's been some time, use something like the Prestone Two-part flush (it's a pair of powders - a flush and a neutraliser. Follow the instructions precisely, except for one thing - do an extra flush after the neutraliser, using clear water. Drain as much water as possible, then refill using mixed coolant and distilled/purified water. Reverse-osmosis filtered water is acceptable, tap water is not.)

As far as which way water flows through the heater core, it's easy to tell. Find your water pump up front, or locate your thermostat housing. Follow the small hose back to the firewall (bulkhead between the engine bay and you.) If you followed the hose from the water pump, that is the hose going IN. If you followed the hose from the thermostat housing, that is the hose going OUT. If you need to flush the heater core specifically, disconnect both hoses, then run the flush water in through the hose that normally flows OUT (this will break up more scale than would running water through in the normal direction.)

NB: It is possible that you can get small leaks from the heater core on an older vehicle after a flush (ditto the radiator.) This isn't erosion caused by the flush chemical - this is a pinhole leak that was plugged up with system deposits - you simply cleaned out the crud that was blocking the leak. Solder/braze closed or replace the component.

goblinish15

this sounds like a way bigger pain in the *** then i thought!!! dam!well wish me luck

goblinish15

I can't get the dam hoses off!!!!! erg! its like impossiple to pull off!

4.3L XJ

Take a pair of pliers and grip the hose where it goes on the core inlet. Don't crush it. Give the hose a twist. You will hear it break loose.

goblinish15

I replaced allll the heater and a/c hoses and a bunch of others and the little box looking thing that lets the collant out into the heater inlet i replaced that little thing so therefore my problem is solved!