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Old 08-23-2012, 09:05 AM   #9
DANIMAL's Avatar
Join Date: Mar 2006
Location: Hamilton
Posts: 964
Originally Posted by doogee View Post
Sounds like the system needs more bleeding to me...
+1, if it is the heat that is going on and off, and the blower remains constant.

If the blower is turning on/off or weak at lower fan speeds and blows hard on high then its likely your final stage unit.

If it is intermittent, even on full, and you have a digital climate unit, you may need to replace a resistor inside.

If those two fail then you may need a new blower. You can test the blower directly using the plug to your final stage unit. Research the pinout; I diagnosed a final stage unit failure by jumping the terminals. You should be able to test every speed of the unit. Don't leave it jumped too long, it takes a lot of amperage so the wires/jumpers will get hot quick.
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