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Heat Goes Away When Car is Stopped - 1990 Legacy

In an earlier post I was dealing with a problem where the blower would not come on. Managed to fix that problem. It was a cold solder joint on the connector at the back of the dashboard switch unit. So now when the car is going, warm air is being blown about the car.

Now for the interesting twist. When the car is stopped for a minute or two, the air being blown out of the heater or defrost vent goes cold. When the car starts moving again, warm air reappears.So I am thinking one of two things might be happening:

1) The coolant level is low (or maybe an air bubble) and when the engine is idling hot water is not making it into the heater box to be blown through the interior.

2) There is a solenoid or something that cuts off hot water to the heater coil when the engine goes to idle speed.

Any ideas?

Thanks!

Don

Reply to
Don
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most likely #1

Reply to
dnoyeB

Hi Don,

That sounds as if your internal heater pipe is partialy blocked or kinked. If you only get internal heat when the water pump is causing pressure from running rpm maybe the circulation is poor and the small amount of water trickling past can be cooled by the fan - what does your water temp gauge say ?

I have a 1987 L series and I took out the thermostat, removed the center device and re-fitted the flat disc with the hole in it, my temp is perfect in the hot Aus summer now and the disc still restricts the water flow enough to encourage the water through the internal matrix.

Let me know what you do to fix it

Regards

Reply to
Martin C

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