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  #13  
Old 10-11-2016, 04:29 PM
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Re: 5.7L needs coolant constant, but no leak.

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Originally Posted by alwaysdutch View Post
I guess a radiator cap is always a thing to buy, but I like to figure out what these two lines are for that run behind the passenger front wheel. There I see a drop of coolant hanging, which might be the answer.
Do they head from the radiator back to the transmission area?

Note that you may see coolant on them, but that doesn't mean those lines are leaking--just that wherever coolant is leaking allows it to get on those lines--presuming it is coolant you see.

You can spend a lot of money guessing, or you can buy the dye kit and pressure kit and test your system. While looking, see if your parts house can test your radiator cap for holding pressure--or just drop a couple bucks and buy one as most of the comments have noted.

And make sure next time you buy coolant, it is the same as what you have.
If the parts clerk insists there is a universal coolant, try another store.

Actually the stuff is reasonably cheap at most dealers if your local parts places suck.

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  #14  
Old 10-11-2016, 04:49 PM
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Re: 5.7L needs coolant constant, but no leak.

Back in 1991 when we moved from Chicago to Lake Havasu City, Arizona, (1,864 miles), I rented a 26 ft. U-Haul with a Diesel. We loaded up and left. I went through a total of 3 gallons of coolant over the 3 days it took us to get there. The engine didn't overheat, or leak any coolant all the way. But it ran well on the hot side. Especially when I returned it empty to Phoenix.

I complained about it, and told them they better find out what was wrong before they rent it out again. The first thing the mechanic did was raise the hood, and remove the radiator cap. He mounted it on a pressure tester, and it wouldn't hold over 2 lbs. That was it. It was allowing the coolant to boil off, and the engine to run on the ragged edge for 3 straight days. If I had known, I would have bought one at the first truck stop. They reimbursed me for the 3 gallons of Prestone. Live and learn.
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Old 10-14-2016, 04:36 PM
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Re: 5.7L needs coolant constant, but no leak.

You have an intake leak. It is burning the antifreeze
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Old 10-14-2016, 05:57 PM
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Re: 5.7L needs coolant constant, but no leak.

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Originally Posted by Zercsi View Post
You have an intake leak. It is burning the antifreeze
I had that happen on a 1976 Buick Century I had. You know it when you are getting antifreeze into the combustion chambers. Your exhaust will steam regardless of how warm the outside temperature is. And you can smell it at stop lights. It's a very sweet smell that smells nothing like normal exhaust.
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Old 10-14-2016, 07:56 PM
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Re: 5.7L needs coolant constant, but no leak.

A simple test if the radiator cap is doing its job is to try to squeeze the upper radiator hose when the engine is hot. Use a rag or glove to not burn your hand. When the radiator cap is ok, you will not be able to squeeze the hose.
That the coolant level drops in the radiator, but not in the recovery tank, is a sign that there is a leak. When the engine cools down, the coolant volume reduces and coolant should be drawn back from the recovery tank to the radiator by the vacuum created by the volume reduction. That the level in the recovery tank doesn´t drop, is a sign that air is drawn in. This can be via a bad radiator cap, or some other leak.
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Old 10-21-2016, 10:54 AM
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Re: 5.7L needs coolant constant, but no leak.

If the cap has a sealing problem, the radiator hoses will collapse after sitting for a while. Sometimes crud gathers around the seal on the cap, and wiping it clean will make things work again.
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Old 10-22-2016, 06:32 PM
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Re: 5.7L needs coolant constant, but no leak.

This should not be that difficult to diagnose. First, pressure check the cap AFTER cleaning the rubber seal on both sides, and then pressurize the entire system to the rating of the cap. If you're losing that much coolant, the leak will become very apparent in short order, as the pressure will drop and the leak will show itself. Use of the correct HOAT coolant is an absolute must too.

All this being said, I just got back from a 1600 mile trip with my Hemi LX (same basic cooling system as the WK/XK) and upon my "postflight" inspection I noticed there was no coolant showing in the recovery tank. First thing I did, using my Stant Cooling System Pressure Checking Pump, is pressure check the cap (only about 6 months old) and it was fine. Then I checked all the radiator hose clamps for tightness and found one of the lowers needed almost 3/4 of a turn to tighten it. After verifying all else was well I then pressure checked the entire system and it held pressure without any loss for over 5 minutes. I always have the HOAT specified coolant mixed 50/50 in a gallon jug, and just topped the system off. Simple fix, and maybe the OP's problem is just as easy. Has he checked all the radiator hose clamps?
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  #20  
Old 10-22-2016, 07:12 PM
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Re: 5.7L needs coolant constant, but no leak.

Quote:
Originally Posted by alwaysdutch View Post
I guess a radiator cap is always a thing to buy, but I like to figure out what these two lines are for that run behind the passenger front wheel. There I see a drop of coolant hanging, which might be the answer.
Have you found the problem yet OP?
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