2007 Saturn Relay Q&A

2007 Saturn Relay Question: heater doesn't work properly

The front heater will blow hot but when you stop for a light it will start blowing cold but will again blow hot when you speed up and the rear heater never blows hot. What could cause this problem? -
Answer 1
MAKE SURE IT IS FULL OF COOLANT. HOW MANY MILES ON ODOMETER? -
Comment 1
It is full of coolant. I even took the cooling system cap off and added water, which was only about a cup full at the most. The van has approx. 93000 miles on it. -
Answer 2
sounds like coolant level is low ck that 1st thing -
Comment 1
I checked by removing the cooling system cap and added water to the system there, which only held about a cupful at the most. -