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Old 08-26-2019, 01:50 AM   #1
I
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Unhappy I need some help. Please, and thank you.

This weekend I did a thermostat, and hoses change on my 2003 Ram 5.7, and I have ran into issues. I am not sure what I did wrong. First thing is that my radiator does not have a drain valve, nor does it have a radiator cap on the radiator. The cap is located on the over flow tank.

When I drained my system the first time I just pulled the lower hose. Which made a mess everywhere. How does one drain the system without a drain valve in a controlled manner?

After I took off the lower hose. I pulled the thermostat. The thermostat came out in pieces. Replaced the housing, and then ran a hose on the back flush "T". After everything ran clear I reinstalled the new thermostat. Put my hoses on, and filled with 50/50 antifreeze.

I didn't realize that my system retained about 2 gallons of water, or I would have used full strength antifreeze.


Now here's where my problem lies. Being afraid that my antifreeze to water ratio was way off I bought an antifreeze tester. I popped open my system, and ran the test. Only one ball was floating. Not good. So racking my brain on how to get about a gallon out I noticed a sweet smell. This was AFTER opening the system today. Prior to today that wasn't any leaked. I drove home. When I got home it was like my entire system was leaking.

Way would the system leak after opening up the overflow tank? Should the thermostat go in pretty easy? When I was putting on the housing the thermostat was falling out of the groove. I had to stick my finger in the housing to get it to go back in, but it never seemed to seat properly. It's a Stant Part number 48792. Is this a bad thermostat for the 5.7?

I need some help to see where I have gone wrong, and I have no one else to ask these questions.

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Old 08-26-2019, 02:44 AM   #2
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It's good you giving the old truck some love... The 03 radiator being the first year of the hemi is unique in that the the overflow tank is part of the pressurized system and you fill the radiator using it's cap. 04+ radiators have their own cap and a traditional overflow tank. Many folks use the newer radiator and install a traditional overflow tank when replacing the 03 radiator. As for the thermostat, you can look it up using Rock Auto. Honestly I have forgotten what I've used. But if it doesn't fit then it is wrong. You can often trim the edge to make them fit. Place the vent hole at the top when installing. I drill mine out to about 3/16" to help clear air from the system. After cleaning a old system it is not uncommon for the radiato to start leaking and will need replacement. Good luck.
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Old 08-26-2019, 03:47 AM   #3
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Likely you trapped some air after opening and it got hot on ya.
Once you top it off again let it warm up real good while it's open and burp it by squeezing the upper hose a few times. Make sure you get all the air out.


You got this!
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Old 08-26-2019, 10:13 AM   #4
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The leak where is it coming from the stat area? If so may not be seated correctly is all. The system will warm up over half the first time most likely burn then top off and it should be good after that
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Old 08-26-2019, 11:19 AM   #5
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I wasn't able to get under the truck at the time, but what I saw was a large drip in the front middle, but not directly under the water pump. Then on my lower hose. Across the cross member, and somewhere about the thermostat area. It was hard to tell as I think the fan had pushed it back.

I had just gotten back from the E.R. with my S.O as she took a nasty fall, and just had spinal fusion done less that 6 weeks ago, and I still had to make dinner for the kids. I wasn't about to hop under the truck.

Today looking under the truck from the front door everything looks dry. No puddles. I still need to figure out how to drain at least the radiator so I can get to the thermostat.
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Old 08-26-2019, 12:56 PM   #6
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I use a plastic bin from walmart, they are cheap and have low sides and good volume. I have to jack mine up to do anything under it, with the front wheels on ramps it's easy to slide the plastic bin around to catch the fluid. Loosen the hose clamp wedge a screw driver under the hose to allow the fluid to flow. Hang a rag over it to direct the flow downward.
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6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...

1956 Jeep Pickup Hemi powered "Street Rod project"

1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
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Old 08-26-2019, 01:44 PM   #7
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Guys I really want to thank you for all the help especially helping a [email protected] like me!

The reason my system was leaking after I opened the system is because I didn't fully close the system!! It spewed out the over flow tank. Thank guys I really do appreciate the help.
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