92 4.0 water sound heard from inside cab?

[Fookie Bookie]

When I drive and apply gas I hear a water sound. Its hard to describe but I'd like to know what the possible cause is so I could go ahead and fix it. Thanks for the help ahead of time TRS!

 

[PlumCrazy]

Sounds like the drain on the evaporator housing is plugged. Pull the passrnger inner fender and look just under the blower motor for a short plastic nipple sticking out of the firewall. It may be plugged not letting condensation drip out.

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[hopster]

could be an air lock in the heater core

 

[wildbill23c]

I agree with hopster, my grandfather's 93 ranger had the same water noise, until the heater core failed and was replaced, after getting the air purged out of the coolant system the noise never occurred again after that. Not necessarily saying your heater core is bad, just my grandfather's had a leak. I'd definitely look at purging the coolant system and then go from there before tearing anything apart.

 

[Fookie Bookie]

Actually that sound very possible because I'm having antifreeze disappearing also but I replaced my radiator not to long ago.

 

[Lil-Pony]

Actually that sound very possible because I'm having antifreeze disappearing also but I replaced my radiator not to long ago.

pressure test?

 

[RonD]

On my '94 4.0l the heater core is part of the coolant by-pass system, there is no heat control valve on either heater hose in the engine compartment, so coolant is circulating thru the core all the time.
Heat inside is controlled by a blend door.

If you do not see a heat control valve on the heater hose then yours is probably the same setup.
Good news is that the heater core is cheap, about $25, and very easy to change, 4 screws and 2 hose clamps, no pulling the dash apart.
Took me 20min.

My symptom was a temp gauge that would go up and down randomly, not hot or cold just up and down in the normal range, core was partially blocked but not leaking.
Heat was warn/hot but not hot/hot, if that makes sense

 

[adsm08]

Ron, an air locked heater core will not be fixed by replacing the heater core. That would probably make it worse.

The best way I have found to get air out of a cooling system without an air lift or radkit is to pop a heater hose off at the heater core, hold it up high, and pour coolant in until it comes out the heater core.

 

[PanamaExpat]

I just bypassed the heater on mine with a chunk of heater hose on the engine output to return. But where I live.... The heater isn't needed.

 

[RonD]

Yes, my heater core wasn't air locked it was partially block, back flushing helped but still didn't have good flow.

Person that had the '94 before me had a flush/fill connection on the longer/higher heater hose, so getting the air out was much easier.

 

[wildbill23c]

I've done what adsm08 has done many times, it works for me every time. Having that heater core air locked can cause overheating and of course no heat LOL.

 

[Fookie Bookie]

I will take a look at my heater core and also pump air from the line also. Thanks a lot everyone!

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