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Old 03-31-2009, 05:26 PM   #1
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Running Hot

1987 5.0 5speed 302 basicially stock. I have checked thermostat in a pot of boiling water, new serpentine belt, adjusted,. Fill radiator, go for a ride. About 15 miles,reading 180, 15 more miles 180 and then it starts going higher and higher, when it gets to 220, I stop and let it cool,add about 1/2 gal water, go home. Next day, same routine,same results. HELP:
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Old 03-31-2009, 10:08 PM   #2
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Re: Running Hot

Well, if you have to add a 1/2 gallon of water, I'd say you have a leak. Make sure the radiator and hoses are good, and make sure there isn't any coolent leaking out of the weep hole of the water pump.
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Old 04-01-2009, 08:47 AM   #3
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Re: Running Hot

Check for signs of leakage with the heater core (wet pass floorbard, water leaking under car near chassis. Do you smell coolant? I would say check your fans, but the coolant is leaking obviously. Where are you located.

When you fill the system make sure that you burp it correctly (work all the water out) if you need help with this let me know.
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Old 04-01-2009, 08:49 AM   #4
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Re: Running Hot

yea i suspect it being the heater core. does the windsheild fog up a little? check the floorboard on the passenger side, do u smel coolant or water in the car?
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Old 04-01-2009, 10:21 AM   #5
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Re: Running Hot

I'm in western NC. Tks
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Old 04-01-2009, 10:23 AM   #6
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Re: Running Hot

The windshield fogs very little, Going to check heater core. Tks
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Old 04-01-2009, 10:24 AM   #7
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Re: Running Hot

Going to check heatercore. Tks
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Old 04-01-2009, 10:37 AM   #8
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Re: Running Hot

yea im sure thats the problem. the only thing that sucks is the dashboard will have to be removed or moved back enough for the heater core to come out.
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Old 04-01-2009, 11:56 AM   #9
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Re: Running Hot

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yea im sure thats the problem. the only thing that sucks is the dashboard will have to be removed or moved back enough for the heater core to come out.
Its a BIATCH
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Old 04-04-2009, 09:30 AM   #10
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Re: Running Hot

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Its a BIATCH
i second that motion....sucks very much bad!!!!
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Old 04-04-2009, 11:00 AM   #11
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Re: Running Hot

Got it fixed. It just needed a new radiayor cap. appreciate all the help.
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Old 04-04-2009, 12:04 PM   #12
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Re: Running Hot

Glad it was a nice easy fix!
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Old 01-14-2011, 01:00 AM   #13
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Re: Running Hot

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Originally Posted by modular2valve View Post
yea i suspect it being the heater core. does the windsheild fog up a little? check the floorboard on the passenger side, do u smel coolant or water in the car?
If its a heater core easy test would be turn the fan on max at vent and just smell for coolant! lol
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Old 01-14-2011, 01:02 AM   #14
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Re: Running Hot

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Originally Posted by Gray Ghost View Post
1987 5.0 5speed 302 basicially stock. I have checked thermostat in a pot of boiling water, new serpentine belt, adjusted,. Fill radiator, go for a ride. About 15 miles,reading 180, 15 more miles 180 and then it starts going higher and higher, when it gets to 220, I stop and let it cool,add about 1/2 gal water, go home. Next day, same routine,same results. HELP:
The boiling pot o water certainly works, but an easyier way just little more time is turn the car on (when cold) and feel the upper radiator hose. If it goes from reg temp to super hot real quick it works fine, but if it gradually warms up over time its stuck open. Just lettin you know another way to test it!
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