5.2 magnum not building coolant pressure## fixed thanks all
#2576174
11/09/18 02:03 AM
11/09/18 02:03 AM
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Joined: Nov 2018
Posts: 3 Alabama
Bama ram
OP
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OP
member
Joined: Nov 2018
Posts: 3
Alabama
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Hey guys please help if you can, 93 5.2 magnum.(Heater core bypass during all the testing) With a radiator pressure gauge I hold 16psi with no drop. Cap tested and pass also.. 2nd water pump in a week I can take heater hose off while running and it pumps water out fine, I can pinch the heater hose and it doesn't affect the top return hose to radiator pressure wise.. block flshed through block drains thermostat opens and trickles out enough to get top tank of radiator hot.. cap on and I don't build pressure and starts to over heat. Would cracked heads do this or can someone please point me in the right direction.. it built pressure one time during testing just long enough to cut truck off, crunk it up and it was gone again
Last edited by Bama ram; 11/11/18 06:23 PM.
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Re: 5.2 magnum not building coolant pressure
[Re: Bama ram]
#2576195
11/09/18 02:49 AM
11/09/18 02:49 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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cap on and I don't build pressure and starts to over heat. It is overheating? what temp? confirmed with a good gauge? idling/around town or interstate? More details please.
live every 24 hour block of time like it's your last day on earth
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Re: 5.2 magnum not building coolant pressure
[Re: Bama ram]
#2576228
11/09/18 05:31 AM
11/09/18 05:31 AM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Radiator is partially plugged. Went through this many times.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: 5.2 magnum not building coolant pressure
[Re: Bama ram]
#2576269
11/09/18 11:51 AM
11/09/18 11:51 AM
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Joined: Jul 2011
Posts: 959 Chicago
PurpleBeeper
super stock
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super stock
Joined: Jul 2011
Posts: 959
Chicago
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My gut instinct is that your radiator cap is bad, even though it tested good...or maybe just not sealing well on the radiator fill neck. It certainly would explain a lack of pressure in the system + your overheating.
70 Roadrunner convt. street car
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'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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Re: 5.2 magnum not building coolant pressure
[Re: Bama ram]
#2576770
11/10/18 02:01 PM
11/10/18 02:01 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Every Magnum water pump I have seen comes with the pulley attached, not to mention they look way different and the LA pump is longer. Probably not an LA pump.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: 5.2 magnum not building coolant pressure
[Re: Y3 70 BEE]
#2576931
11/10/18 10:46 PM
11/10/18 10:46 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Sure you dont have a partial pressure radiator cap? that jogged a memory cell, so I dug it up, http://www.allpar.com/fix/engines/cooling-caps.html
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: 5.2 magnum not building coolant pressure
[Re: Supercuda]
#2576943
11/10/18 11:05 PM
11/10/18 11:05 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Supercuda, good read/info, thank you!
live every 24 hour block of time like it's your last day on earth
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Re: 5.2 magnum not building coolant pressure
[Re: Bama ram]
#2577036
11/11/18 08:36 AM
11/11/18 08:36 AM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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All the magnums have the fixed pulley with the single nut fan clutch. Only the 91 318 Dakota had a bolt on pulley with the serpentine belt.
So let's recap, water pump replaced, pushes water out the heater hose so it's moving water. Tstat opens, cap tests good and it holds pressure. Block has been flushed out. Hmm, radiator is still partially plugged whether he wants to believe it or not.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: 5.2 magnum not building coolant pressure
[Re: Bama ram]
#2577269
11/11/18 09:42 PM
11/11/18 09:42 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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You guys aren't so bad I'm going to have to stick around and check out what this site has to offer You just caught us on a good day (fasten your seat belt), you'll see!
live every 24 hour block of time like it's your last day on earth
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