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Old 11-24-2012, 03:02 AM   #1 (permalink)
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Default why does my heater blow cold when idling?

recently bought an 04 xl 7 with approx 84000 miles

My heater seems to blow cold at idle but great while driving.

Checked fluid.. all full.

what else could it be??
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Old 11-24-2012, 08:00 AM   #2 (permalink)
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You checked the radiator level, not just the coolant overflow tank, right?

Is the temp gauge at "normal" (mid range) during this no heat episode? If not, proly a thermostat issue.

If all in spec (temp & level wise), I'd suspect the water pump.
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Old 11-24-2012, 10:24 AM   #3 (permalink)
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yes i checked both the radiator fluid and the overflow tank both are full. temp gage stays normal at all times.

I thought maybe the heater core was plugged Didn't even consider the water pump.
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Old 11-24-2012, 10:48 AM   #4 (permalink)
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Quote:
I thought maybe the heater core was plugged
It's possible that it is partially restricted, and at higher engine speed / pump pressure some coolant then gets thru. But that much potential clogging debris should be evident inside the radiator as viewed through the cap opening.

I suppose that if the coolant system was never serviced and the system is that mucked-up or ran w/o anti-freeze protection, it's possible that you have clogging.
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Old 11-24-2012, 02:29 PM   #5 (permalink)
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replace the thermostat. Its stuck open
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Old 02-27-2013, 04:23 PM   #6 (permalink)
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My issue is similar...

When engine first gets up to temp after a couple of minutes, when I put the fan switch to defrost all the way to the right, the temp control is basically meaningless. It pumps out fully hot air only, regardless of where the temp control is at.

Once the engine has been on for maybe a half-hour or more, the reverse is true. It only is cold-ish and never gets "hot" unless I put the temp control fully to the right detent which is full hot. Then I get all hot. So it's either all hot, or cold-ish...no mixing.

Is this just a thermostat issue?
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Old 02-27-2013, 08:46 PM   #7 (permalink)
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Your issue is different - the mixing is done using "blend doors" in the heater plenum, your's are not moving correctly - the plenum is behind the dash in the center, stick your head underneath and slide the temp control backward & forward, you should see where the other end of the cable connects, check the linkage and make sure it's working properly.
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