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I have a Thetford C400 and have fitted a SOG vent system on it. Flush will only work when the flap is shut.

The fan runs fine when I open the flap but will not flush. It will only flush with the flap shut which it should not. If I disconnect the fan then the flushing works as it should. What can I do to fix this. cheers les

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Posted on Jan 02, 2017

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SOURCE: how do you back flush the cooling on a 2001 osmobile sillouette mini van

Use the heater hose to back flush the cooling system, they make an adapter kit for what you are doing, it's very inexpensive, it goes in the supply line to the heater core, that is the larger of the 2 hoses.

Posted on Oct 19, 2008

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SOURCE: How can I flush my whole coolant system

Preferable to flush as much out as possible to get rid of the old stuff and can be done at home by undoing the heater hose at the fire wall and using the garden hose to force water through until it comes out clean Dont turn hose on full blast as it will spray out over everything build up to it so it doesnt make a mess.Make sure the heater is in the on position so that water comes out the pipe you took the hose off.Either way though it will still be ok to just undo the bottom radiator hose as the majority of it will come out.

Posted on Nov 20, 2008

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SOURCE: proper method on coolant system flush

Best way is to buy a flush kit. It is an adaptor that you put in your heater hose and can hook up a garden hose to. You cut the hose and put this device permanently in the line. Remove the thermostat, don't put the new gasket in there yet just put the outlet pipe back on and bolt it down. Run the car when cold with your hose running for about 10 minutes with the radiator drain valve open on the bottom of your radiator and the cap loose, water should come out of the drain valve and the radiator cap. This will flush your engine adequately, why waste money on distilled water, save that for topping off your battery. Turn off your engine continue to allow water from your hose to flow as long as you are seeing any thing other than clear water flow until it flows clear. Turn off the hose, put the cap on the flush port you installed. the port stays under your hood and allows you to flush your engine as needed. Let the water drain through the drain valve. Put in a new thermostat, with a gasket this time. Refill with water and antifreeze as directed in your manual. You should be good to go.

Posted on May 21, 2009

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SOURCE: how to flush coolant system dodge 2004 4x4 pick up truck 4.7 engi

After playing "hide and seek" with drains for years, most times finding they will not turn or are otherwise broken, I finally got smart and began just removing the lower hose from the radiator. It is far faster, most times easier to get to and does the job!! Don't do this hot or you will get an unwanted bath of hot antifreeze. Remove the fill cap after you have the hose off.

Posted on Aug 30, 2009

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SOURCE: I have a 2005 murano and recently got a coolant

you will see the heater hoses coming out of the firewall to your engine.. remove them from the engine and backflush them with a water hose, run water through it both ways, until you get a good adequate, constant flow of water. put the hoses back on, start the vehicle with the radiator cap off... let the thermostat open up and and cycle through a couple of times.. by this time the vehicle should be up to operating temperature and blowing heat for you.. make sure the radiator is topped off with fluid, and put cap back on... the engine does not have an issue being pluged, or the vehicle would overheat, if its pluged its in the heater core.. the a/c would work because it doesnt use the coolant of the vehicle to operate.. you can do this yourself for $0.00. and if you need further assistance with it feel free to let me know, or email me at id be happy to help.

Posted on Dec 06, 2010

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I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?

A vent flap actuator probably needs to be replaced. It's what moves your vent flaps from heat to A/C or to plain "vent air" when you change settings.

The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

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Your particular actuator will be a different one than they found.
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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.

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do it without the thermostat fitted
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old school way
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2 Answers

2004 2500 6.0 Silverado ac blows HOT on alternate sides of vehicle while in Auto A/C mode.

Douglass, Your A/C may have lost it's programming, blend door actuator could be faulty or A/C could be low on refrigerant. You may have to take in and have a good Tech. diagnose and estimate repair.
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