Over heating antifreeze gets pushed back into main tank

All petrol/diesel engines require a radiator, otherwise they oveheat.

Pull bottom plug out of hot water heater tank let all water drain. Then open all water tank drain valves and be sure your RV is tilted so it will drain towards the valve. Go in RV access water heater valves put it in bypass so no antifreeze can enter water heater tank. Pump RV antifreeze with hose provided into all water lines throughout RV by turning on your main water pump after you have stuck the bypass hose in a new and full antifreeze bottle, then flush toilet until red antifreeze comes out. Open all faucets one at a time until red antifreeze comes out. I use 3 gal but some only use one, the more the better it’s cheap at Walmart. Don’t forget to run outside shower until red antifreeze comes out also, very important or it will crack in the cold. Finally make sure black and grey tanks are empty and flushed at your last camp trip before winterizing. Pour antifreeze in toilet and all drains making sure first that black and grey tank shut off valves are pushed in and closed. Get a quality cover and store RV, it makes a huge difference on protecting roof and roofs lap sealant! All RV antifreeze is non toxic and you just drain it all at your first camp stop after winter! Note: don’t forget to put water heater ionizer drain plug back in wrapped with new white Teflon tape and take water heater valves out of bypass! Draw a diagram of regular mode and winter bypass mode so you don’t forget especially hot and cold water heater blender valve between the two MUST be shut off after you unwinterize
or you will cool your hot water unwanted and have no hot water to use! Happy Camping folks!

If you have a back flush kit on the engine, use it to fill the engine. It will help push air pockets out of the block. Fill it with water, then run the engine until the t/stat opens and air is pushed into the radiator. Add water until the radiator is full. Run engine long enough to be sure there are no more air pockets in the block. Let engine cool a while then let water out of the drain petcock until enough water is let out to make room for antifreeze. Add antifreeze then run engine until t/stat opens again . Top off radiator with more antifreeze.

Antifreeze? Hello, not good...Antifreeze is not substitute for fuel - might get it diluted enough if you completely fill tank. Or did you use 'Heat' water removal gas additive? See this post on Yahoo:
How do you eliminate water in your gas tank Yahoo Answers

sounds like you need more antifreeze , make sure fluid is at proper line on overflow tank

Fill the tank with the CORRECT antifreeze up to the fill line (There should be two lines - a "Hot" and a "Cold"). Find out where you are losing your antifreeze - look for a puddle under the vehicle after you fill it. If no puddle, run until the vehicle is warm, shut it down, and look for a puddle.

If your cooling system was empty, you may have to bleed the system after filling the tank. A shop manual for the vehicle should tell you whether you have to bleed the system.

Try checking your antifreeze levels. If you antifreeze tank is low try filling it to the "Fill" or "Full" level. If your antifreeze tank is empty, remove your radiator cap, (make sure the engine has cooled off. If you try to open it while it's hot, you could get sprayed with hot antifreeze) and fill the radiator slowly. Then refill your antifreeze tank. Remember to always mix the antifreeze with water (50/50 mix) for full protection.

Hi Nicole,
Let's try this first... it could just simply be that the coolant (antifreeze) level is too low. Let's check it... When the engine is cold, take off the radiator cap. When you open up the hood, it USUALLY is on the left side of the engine compartment closest to the front of the car. It looks something like the radiator cap below. You have to seriously push down on the cap while you turn it counter-clockwise. It may turn about 1/4 turn counterclockwise and the feel like it stops. At this point push down hard on it and the continue turning counter clockwise.
So look inside and you should see a greenish or pinkish fluid (the coolant). If you cannot see coolant or it is not full, fill it with a 50/50 mixture of water and antifreeze. A funnel makes it much easier. Suggest adding a bit of water (a few cups) then a bit of antifreeze alternating to approximate the 50/50 mixture. If you bounce the car a bit, you may get it to bubble up and make more room. (or you can buy some "premix"... but it is just watered down antifreeze and is therefore more expensive. Fill it right to the top. Put the cap back on tightly. Now look on the left side somewhere near the left fender. There likely is two plastic tanks with plastic fillers.... one is for windshield washer anti-freeze and the other is for an overflow tank for the coolant as it heats up in the motor and expands. As it cools, it will **** in the extra coolant in reserve that is in this tank. Look on the side of the plastic tank for a "cool" and "warm" level indicator and fill it up with more 50/50 mixture.
NOW... this is assuming that if was coolant level that is causing your problem. Please let me know... if this doesn't work, we'll work on a second solution.
I'll be waiting to hear from you...
/denis

It sounds like you need a new Radiator cap for the overflow style Radiator. The overflow style has a recovery vent which draws the water back through the radiator neck and into the engine. Low heat levels are also a sign of a water shortage.

Your antifreeze strength needs to be 50/50. This sounds like there is an ice block inside the Radiator or engine. Get the strength of the antifreeze tested.

You could have an internal leak; you need to have the system pressure tested. The overflow tank should drain back into the radiator and it relies on a sealed system to work. If you have a leak, there will be no Vacuum pressure to draw the antifreeze back into the engine.

It could be a head gasket leak, or a leaking heater core, or bad radiator or a bad hose. The pressure test can be done by anyone with a gauge. You could try Autozone or Oreillys for their loaner tools. Ask for a Radiator tester pump. You can also have the cap checked.

Radiator and A/C shops do this test routinely. A real Service station used to do this routinely until they went self-serve.

I hope my solutions give you a few alternatives because a head gasket is a costly repair. I hope you find my solutions very helpful.

i had the same problem until i changed my water pump,so you might want to get that checked out