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ncarreiro3
New User
May 26, 2008, 12:22 PM
Post #1 of 3
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Coolant System Problems
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Hi.
I own a 1995 Plymouth Neon. This weekend we replaced the radiator, thermostat, cap. No more leaks anywhere and no longer is it overheating. The fans/blower come on when they are supposed to and any fuses from the car that we can find related to the sys. look fine.
Now, new problem is that the heat will not come on. I am only blowing cold air. I have the heat on full blast but nothing is happening.
Any clue as to what needs to be troubleshooted next? Any help would be appreciated.
Thanks,
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DanD
Veteran
/ Moderator
May 26, 2008, 2:07 PM
Post #2 of 3
(3056 views)
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Re: Coolant System Problems
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Where’s the temperature gauge; I’m assuming it’s sitting in its normal range?
The heater uses engine coolant, pumped through the heater core to supply the heat inside the car. A heater core is like a small radiator up under the dash.
Are both heater hoses hot to the touch, when the engine is running and up to temperature?
If not; a couple of things that might be happening; one being, the coolant level is too low and there’s not enough to feed the heater core?
Or there is air trapped in the heater core, preventing the hot engine coolant from circulating through the core?
Wait until the engine is cold and check the rad level; check it at the cooling systems fill cap, not just the reserve bottle.
If it’s full; you could try removing one end of a heater hose at the engine. Look for the hose that sits the higher of the two. You don’t have to completely remove it; just slid it off enough to allow any trapped air to escape.
I’ve had to go to the extreme of starting the engine; while holding the hose just off its spigot; allowing the water pump to push the air out. Slipping it on quickly, once I see coolant flowing. Be very careful doing this; things get hot in a big hurry; so don’t get your self burned.
Dan.
Canadian "EH"
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brbettge
User
May 31, 2008, 5:29 AM
Post #3 of 3
(3039 views)
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Re: Coolant System Problems
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The simple answer is usually the answer. coolant level could be low. But, there is a little thing called a heater control valve that allows the coolant to flow into the heater core. with the work you have done I would say that the valve controls have been knocked off the valve, or possibly not re-connected if you have disconnected them. it's an easy thing to forget. the valve should be located in an accessable place - i'm not real familiar with this particular vehicle - but should be in line with one of the heater hoses. probably against the firewall...mabe as bad as under dash. I would just follow the heater hoses to find the valve. it will either have a cable that hooks to it or will be a vacuum pod with a vacuum hose that attaches to a small "nipple" sticking out from the end of it. good luck! autozone can give you a pic of the setup that will help. rick
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