Question about 1994 GMC Sierra

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Just flushed cooling system. Now I have sloshing water sounds. 1994 GMC C1500 5.7L V. Is there a way to flush the air out of the system? It does not have the bleeder valve on the thermostat housing.

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  • jkw0 Jul 27, 2009

    Where is the temp switch located?

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Remove the temperature swich and leave the water run untill no air bubbles are visable.hope that was helpfull,.

Posted on Jul 27, 2009

  • Philip Long
    Philip Long Jul 28, 2009

    on the top of the cylinder head.,If you cant find it you can also remove the feed back pipe to your expantion tank and point it down until the water runs freely That will also bleed your system.Hope that was helpfull.

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Hi this dan....temp is hovering around 220 on 97 gmc 5.7. Thermostat, water pump temp sensor, and flush has been done already. dont see any leaks anywhere. when first started the temp goes to 240 then back to a steady 210-220 and runs good. It still bothers me. why running so hot?? any suggestions. How do I find a blockage within the engin? Head gasket soes not appear to be leaking either.....thanks....

Posted on Nov 15, 2009

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Posted on Jan 02, 2017

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Does anybody have a video link on how to flush the cooling system on a GM 3.1L SFI OHV 6cyl motor? I need a vid for this particular motor cause mine is still overheating & i have looked everywhere.


flushing a cooling system is the same method as any other motor

do it without the thermostat fitted
or water pump opening

sacrifice an old radiator hose to adapt a garden hose fitting
for radiator flush

air in system fix
your thermostat housing has no air bleed valve
no top radiator cap

old school way
heater on full
run motor till thermostats fully open
burp radiator hoses
wait till water is running up into over flow bottle without bubble
replace cap
turn off heater
correct level in over flow bottle

why still over heating
you fitted everything i would have ... yet still overheat
possibles
leaking inlet manifold gaskets
hose clamps loose
cooling fans spinning too slow
thermostatic fan switch faulty
aluminum radiator is a big one
air ..fins bent or some water channels blocked

or possible head gasket leak




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Nov 02, 2016 | Cars & Trucks

3 Answers

Little heat when car is heated


when vehicles get this old and maybe there fluids havent been kept perfect over the years then yes due to sedaments in the cooliing fluid the heat core tends not to get as hot as it did when new , you can try a coolant flush , run heater while proforming a "hot" flush but do use all the normal precausions when dealing with hot engines

Feb 20, 2015 | 1994 GMC Sonoma

1 Answer

Heater blowing warm and cool air


Try flushing the cooling system. The heater core us probably clogged. A flush may clean it out. Good luck.

Nov 18, 2013 | 1994 Oldsmobile Ninety Eight Regency

1 Answer

Heat not working in 2006 mdx acura


The whole system is very simple. There is a valve that opens and closes on one of 2 hoses that come from the engine. If the heater core is not getting water, the valve itself is the problem. If they did the flushing properly they should have checked to see if that valve was fully open to allow the flushing process to clean out the heater core too. If there is sloshing in the heater core (check it by listening under the dashboard when heat is turned on) then there is AIR in the core stopping the antifreeze mix from going through its coils. Remove the heater switch on the heater hose and check it for proper action first. Next have a compressed air test of the heater core to see if it is clogged. If you fix this, try to do regular maintenance on your beautiful MDX!

Jan 12, 2013 | 2006 Acura MDX Touring

2 Answers

HEATER ISN'T BLOWING HOT AIR


Sounds like a restricted heater core. Remove the hoses and back-flush the heater core system with a water hose. You may want to do a complete cooling system flush while you're at it.

If you can't flush the heater core clean with a water hose, it may be time to replace.

Jan 06, 2013 | 2002 Ford Ranger Regular Cab

1 Answer

I have chevy impala 2002 and lately I have been hearing water sloshing (sounds like it s coming from the dashboard...), any idea what is it? and can be fixed?


Sounds like air in your heater core. That's the only place fluid comes into passenger compartment. To eliminate, make sure coolant level is filled completely or have cooling system flushed.

Feb 21, 2011 | 2002 Chevrolet Impala

1 Answer

Air flow will not get hot. Only warm, about 67 degrees is all. Have replaced thermostat. Fan motor operates fine, just temp sensor seems to have no effect.


Hello! The heater core is partially blocked...I would suggest flushing the cooling system with the temperature control on high...NOTE...The type of anti-freeze used in your vehicle is DexCool...If another type is used it may damage the cooling system...To flush...Drain radiator...Fill with plain water...Run engine until thermostat opens...Turn engine off...Let cool then drain...Do this at least three times or until water drains clear...Install new thermostat...Refill with 50/50 DexCool...Leave the radiator cap off as engine warms...Allow all air bubbles to escape...Then install cap...

The down side of DexCool is electrolysis...Electrical current flowing in the cooling system which can cause the anti-freeze to "clump" blocking its flow...Periodic flushing eliminates the problem...

Guru.........Saailer

Feb 03, 2011 | 1994 Cadillac Fleetwood

1 Answer

2004 LeSabre Limited - Have a noise that sounds like water sloshing under the dash when making turns or sudden stops. Mechanic checked the A/C drain and claims it is clear. Any ideas?


Its the heater core. There is air in it allowing the coolant to splash inside it. You should bleed the cooling system. Its good to flush it out completely and refill it correctly.

Oct 15, 2010 | 2004 Buick LeSabre

1 Answer

1994 toyota pickup heater stopped working


Sounds like there is air in the cooling system causing the engine not to overheat but the heater not to work. Flush cooling system and work the air out of the system.

Mar 01, 2009 | 1994 Toyota Pickup

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