Quote:
Originally Posted by surfer-joe
Actually, hot coolant should enter the heater at the top, and exit at the bottom. Switch the hoses around and try that. Many of these heaters have a temperature control cable running to an inline valve, generally right near the heater. If that cable is broken, rusted, or bent, the valve may be closed or partially closed. Check that.
The other ideas here are also good. I've found many the same problems over the years.
Good Luck!
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I would go with the heater valve not open
Is both heater hoses hot? If they are both hot, I would think the heater core is full of dirt/dust(external) If it had a filter, I would say it was stopped up.
I think someone said to take the hoses off at the heater core and see if there is a good flow out one of the hoses. If you have good flow then, as stated hook up a garden hose to one side of the heater core, with low pressure, keep an eye on what comes out of the other port.
If all this is OK, the return(heater hose) has a problem, hook up the water hose to this and see if you have flow, it should be coming out the other heater hose. This should be simple to troubleshoot, but Im thinking heater valve. I had to replace a cable on one of my trucks last week, it was broke in the housing
Good Luck
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