New thermostat?
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New User
Joined: Feb 2004
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New thermostat?
Have a 92 V6 XL and when the van is idle say at a light, the heater blows a luke warm-coolish air but, when actually in motion, the heater works perfect. Is this just a simple case of a malfunctioning thermostat? 
Elder User
Joined: Dec 2002
Posts: 624
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From: Georgia
That sounds more like the water pump. The pump is not pushing much coolant when the engine is running that slow. The coolant in the heater core cools off. Rev the engine and more hot coolant flows through the core and you get more heat. That's my guess.
Elder User
Joined: Dec 2002
Posts: 624
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From: Georgia
I like the idea of flushing things out first. It's cheaper and may fix the problem. Someone here suggested flushing the heater core seperate from the rest of the system and to flush it both ways. Good idea.
Then if it still doesn't work check out the pump.
Then if it still doesn't work check out the pump.
Senior User
Joined: Feb 2004
Posts: 195
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you can check the water pump by undoing the heater hose by the water outlet of the engine and installing another peice of hose there. start engine. water should shoot out of the hose at idle. if not your pump is bad. keep a water hose in radiator to keep it full when your doing this.
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