I have a 1999 GMC Savana van. The fan works but not heat comes out. When the heater runs the temp gauge drops 10 to 20 degrees. The thermastat has been replaced. What do I look for next?
2006-10-30 12:44:53 · 6 answers · asked by savana992001 1 in Cars & Transportation ➔ Maintenance & Repairs
You may have a defective heater control valve or a plugged heater hose or heater core. The mix of the antifreeze as mentioned in post 2 will not help.
2006-10-30 13:05:01 · answer #1 · answered by ? 6 · 1⤊ 0⤋
The heater core could possibly be plugged, or something could be keeping the temp. mix door in the heater case from switching all the way to hot air.
2006-10-30 21:25:32 · answer #2 · answered by whatup 2 · 0⤊ 1⤋
back flush heatercore from water pump hose for 5 minutes and bleed air out of system with heat on #3 SPEED ON HOT ALLTHE WAY
2006-10-30 21:05:46 · answer #3 · answered by dr car g 2 · 0⤊ 1⤋
heater control valve
2006-10-30 20:47:32 · answer #4 · answered by spencer 3 · 0⤊ 0⤋
check your antifreeze mix, it should be about a 50/50 mix with water. If you have almost all antifreeze it won't heat up sufficiently.
2006-10-30 20:49:05 · answer #5 · answered by Anonymous · 0⤊ 1⤋
heater control value
2006-10-30 20:52:33 · answer #6 · answered by yhnkaygisiz 2 · 0⤊ 1⤋