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73-87chevytrucks.com
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73-87 Chevy _ GMC Trucks
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Coolant Leak
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Topic: Coolant Leak (Read 1441 times)
teamcurtis
Newbie
Posts: 57
dangerous mechanic
Coolant Leak
«
on:
April 21, 2019, 10:43:18 PM »
I have replaced this water pump twice now and I keep getting a Heavy, drain all the coolant leak.
Its possible im just not getting a good seal, but I wonder if something else is going on.
The first time the pump went out things were REALLY rusty inside. I had the replace the water neck and thermostat. The neck was rusted alway to almost nothing. I replaced the neck, thermostat, and waterpump and everything seemed to work fine for about a week. Then it started leaking again.
The last time the bong on the radiator for the heater line pulled off as it was rusted clean through. So I replaced the radiator with a 3 row aluminum champion radiator. Its a 19" which seems over sized for a 350. I did not reinstall the fan shroud.
Installing the water pump I cleaned the block really well with a razor blade then brake cleaning fluid. I used water pump gasket sealer on both sides of the gasket and let it cure overnight before filling the radiator.
I used distilled water and antifreeze. 3 to 1, and added some radiator flush to clean out the whole system. Brought it up to temp for about 10 mins and let it cool down. Warmed it up again later that day and let it cool down. No issues. I warmed it up today for about 20 mins and it dumped all the coolant on the driveway. I couldnt really tell where exactly the leak was.
Am I just bad at replacing waterpumps or is something else going on?
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1978 C10 Short Bed
350 smogged for CA
VileZambonie
Global Moderator
Senior Member
Posts: 19028
Re: Coolant Leak
«
Reply #1 on:
April 22, 2019, 04:30:17 AM »
Did you purge all of the air from the system before putting the cap on? Was the thermostat open all the way? Use a pressure tester to check for leaks.
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, ___
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74 GMC
,
75 K5
,
84 GMC
,
85 K20
,
86 k20
,
79 K10
teamcurtis
Newbie
Posts: 57
dangerous mechanic
Re: Coolant Leak
«
Reply #2 on:
April 22, 2019, 11:19:38 AM »
I know the first time I replaced the pump I left the cap off until it cycled once. I dont think I did the second time.
The thermostat seems to be opening based on the fact that all the hoses were getting hot.
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1978 C10 Short Bed
350 smogged for CA
Irish_Alley
Tim
Global Moderator
Senior Member
Posts: 13319
Family is not an important thing. It's everything.
Re: Coolant Leak
«
Reply #3 on:
April 22, 2019, 04:00:54 PM »
need to find the leak. could be just from a loose hose
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley
When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
teamcurtis
Newbie
Posts: 57
dangerous mechanic
Re: Coolant Leak
«
Reply #4 on:
April 22, 2019, 11:53:05 PM »
looks like I'm an idiot and didnt tighten the hose clamp on the return line from the water pump.
i pulled the thermostat housing and cleaned it as it looked really dirty while i was inspecting.
once the gasket sealant cures tomorrow ill refill and see if that was the only problem.
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1978 C10 Short Bed
350 smogged for CA
Irish_Alley
Tim
Global Moderator
Senior Member
Posts: 13319
Family is not an important thing. It's everything.
Re: Coolant Leak
«
Reply #5 on:
April 23, 2019, 02:58:13 AM »
im sure we all have done that at least once.
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley
When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
teamcurtis
Newbie
Posts: 57
dangerous mechanic
Re: Coolant Leak
«
Reply #6 on:
April 23, 2019, 11:03:36 PM »
and thats all it was.... all sealed up and runs great.
i do wonder if my thermostat is too high. The gauge reads 3/4 hot before it seems to kick on and quckly drops the temp back to the 1/2 mark
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1978 C10 Short Bed
350 smogged for CA
Irish_Alley
Tim
Global Moderator
Senior Member
Posts: 13319
Family is not an important thing. It's everything.
Re: Coolant Leak
«
Reply #7 on:
April 24, 2019, 12:21:26 AM »
could be air in the system.
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley
When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
JohnnyPopper
Senior Member
Posts: 2560
Old Goof
Re: Coolant Leak
«
Reply #8 on:
April 24, 2019, 05:12:19 PM »
clean and tighten the connection on your temp sensor.
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1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400 Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction
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73-87 Chevy _ GMC Trucks
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Coolant Leak