# 2003 Dodge Ram 1500 - Pressure test

**URL:** <https://community.cartalk.com/t/2003-dodge-ram-1500-pressure-test/151989>\
**Category:** Maintenance/Repairs\
**Tags:** dodge\
**Created:** [November 2, 2019, 1:20pm UTC](https://community.cartalk.com/t/2003-dodge-ram-1500-pressure-test/151989 "2019-11-02T13:20:04Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![tim01](https://avatars.discourse-cdn.com/v4/letter/t/9f8e36/32.png) [@tim01](https://community.cartalk.com/u/tim01)\
**Post date:** [November 2, 2019, 1:20pm UTC](https://community.cartalk.com/t/2003-dodge-ram-1500-pressure-test/151989/1 "2019-11-02T13:20:04Z")

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presure test 15 min no leaks still down gallon antfreeze new 3.7 engine installed 18 months ago ???

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**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\
**Post date:** [November 2, 2019, 1:27pm UTC](https://community.cartalk.com/t/2003-dodge-ram-1500-pressure-test/151989/2 "2019-11-02T13:27:01Z")

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If you really have a question then this poorly written post is not the way to do it.  
Return and edit so people will have some idea what you are asking.

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**Author:** ![tim01](https://avatars.discourse-cdn.com/v4/letter/t/9f8e36/32.png) [@tim01](https://community.cartalk.com/u/tim01)\
**Post date:** [November 2, 2019, 1:37pm UTC](https://community.cartalk.com/t/2003-dodge-ram-1500-pressure-test/151989/3 "2019-11-02T13:37:20Z")

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Loosening antifreeze had engine pressure tested for 15 minutes no leaks anywhere but down almost a gallon of antifreeze engine is a 3.7 liter 6 v engine is new had it installed 18 months ago only has 12000 miles so I am very puzzled thank for any help in advance Tim

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**Author:** ![tcmichnorth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tcmichnorth/32/25126_2.png) [@tcmichnorth](https://community.cartalk.com/u/tcmichnorth)\
**Post date:** [November 2, 2019, 2:43pm UTC](https://community.cartalk.com/t/2003-dodge-ram-1500-pressure-test/151989/4 "2019-11-02T14:43:18Z")

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A pressure test should also include the cap. You may have a bad cap and loose coolant during operation. Head gaskets can be decietful as well. Check compression and also see if cooling system pressure increases with engine running.

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**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\
**Post date:** [November 2, 2019, 3:26pm UTC](https://community.cartalk.com/t/2003-dodge-ram-1500-pressure-test/151989/5 "2019-11-02T15:26:13Z")

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At the time you installed the replacement engine . . . did you bleed all the air from the coolant system?

Please don’t take this the wrong way . . .

How did you go about determining “no leaks anywhere” . . . ?

Have you 100% ruled out the heater core and radiator?

Is the truck on jackstands?

Did you roll under there, on a creeper?

Did you use an extremely bright flashlight . . . such as an led stinger, for example . . . and telescoping handheld mirrors, so that you could look in every nook and cranny?

Sometimes you won’t see dripping coolant, but you’ll see dried residue, which is a big clue

Some components only leak cold, whereas others leak when hot and warmed up

Another thing to consider . . . coolant getting into the crankcase

Have you performed a block test?

In other words, have you used one of these?

![image](https://global.discourse-cdn.com/cartalk/original/3X/e/b/eb1f2030742dca845532c37c91b80b5e1f17f731.png)