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Coolant not flowing and builds up pressure.

Tiny
IOWAN86
  • MEMBER
  • 1995 DODGE NEON
  • 182,000 MILES
I just put a new head gasket on this car, (95' dodge neon 2.0L SOHC) I had the head pressure checked and resurfaced. I also bought a head gasket set, so new head bolts and everything. I torqued the head down in the 4 stage process and everything. Well now it seems to have the same problem, the coolant isn't flowing, and it dont let me just dump in water to fill up the system, I can only add a little bit, then have to start the car, let it run a minute, shut it back off and then add more water to it.


Also it is leaking oil now from whats to look like the back side of the valve cover gasket, I used the torque specs but if by chance I got them over tightened on the vavle cover could this cause it to leak oil?

Thank you for your help!
Jonahton
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Saturday, May 19th, 2012 AT 7:45 PM

13 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you replace the thermostat and water pump>>

overtightening could do it but I doubt it. The fagsket amy have slipped. Remove the cover and re check

Roy
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Saturday, May 19th, 2012 AT 8:00 PM
Tiny
IOWAN86
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  • 43 POSTS
Yes I replaced the water pump, timing belt, and a new thermastat.
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Saturday, May 19th, 2012 AT 8:02 PM
Tiny
ASEMASTER6371
  • MECHANIC
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The iar needs to be pruged from the system. If the thermostat is on top of the motor, remove the housing and the thermostat. Add coolant until the coolant comes out the hole for the thermostat. Then re install the thermostat. Then the only air is a littl above that level.

Roy
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Saturday, May 19th, 2012 AT 8:05 PM
Tiny
IOWAN86
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  • 43 POSTS
I purged the air from the lines and still have the same issue. Pressure building up. Is there anything else that could cause this issue?
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Tuesday, May 22nd, 2012 AT 11:36 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Remove the top hose at the rad. Keep the hose on and in the filler neck. When the stat. Opens water will flow out the upper hose when stat. Opens and the hose is refilling the radiator. Let it run through 5 stat. Open and closing. This will be what u call flow.
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Wednesday, May 23rd, 2012 AT 1:20 AM
Tiny
IOWAN86
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  • 43 POSTS
I took out the thermastat all together and drove it and it is still building up alot of pressure up in the cooling system really fast.
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Wednesday, May 23rd, 2012 AT 9:45 PM
Tiny
CADIEMAN
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  • 3,544 POSTS
Ck] for flow by doing what I said. No stat the water should run constantly out the upper hose
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Wednesday, May 23rd, 2012 AT 10:01 PM
Tiny
IOWAN86
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  • 43 POSTS
Ok thermastat out, turn on car. Disconnect the upper radiator hose from the radiator and a little water came out. After running about another 10 seconds more water flowed out only for a few seconds. Maybe a quart of water total. After that nothing more came out. Too me it seems like something is blocking the water way or something but I flushed the coolant system and it all came out with no problems. Please point me in the right direction. Thank you for any help.
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Friday, May 25th, 2012 AT 1:04 AM
Tiny
CADIEMAN
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Make sure u have the proper stat. Then put the stat back in. Check in a pot of water on the stove. That it opens. Reinstall it and remove the top hose at the rad.U should see it opening and closing. This is flow. Sorry its so long been sick.
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Friday, May 25th, 2012 AT 2:59 PM
Tiny
IOWAN86
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The flow seems to be flowing, but when I drive it, its still getting hot after I drive it about 20 miles, and seems like its building up a lot of pressure in the cooling system, making it bubble water out of the overflow tank.
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Sunday, May 27th, 2012 AT 4:05 PM
Tiny
CADIEMAN
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Test the cap. If it still bubbles.U still have a head problem test for hydocarbons in the colant. Buy a test kit at the parts store
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Sunday, May 27th, 2012 AT 9:34 PM
Tiny
IOWAN86
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It turns out that the Radiator in these cars are pretty crappy and that some of the fins will clog up, this allows the water to still circulate but under driving conditions or hot weather it does not circulate well enough and causes this to happen. Faulty Radiator the whole time! Thanks for all the help and hopefully this response helps anyone else with this problem in a neon!
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Thursday, July 26th, 2012 AT 10:22 PM
Tiny
CADIEMAN
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The rad was next on the list. Im happy for u.
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Friday, July 27th, 2012 AT 1:06 AM

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