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Search Auto Parts Search 2000 Pontiac Grand Prix GT Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum thealien707 New User Nov 17, 2011, 12:43 PM Post #1 of 5 (3212 views) 2000 Pontiac Grand Prix GT Sign In I was wondering what would cause my heater to only run heat for 30 seconds to a minute at a time. After that it acts like I turned the temperature gauge to half heat half AC. I can turn it off for about 3 minutes and turn it back on and it just continues the cycle. It's a 3.8 L and has 175,00 miles. Hammer Time Ultimate Carjunky / Moderator Nov 17, 2011, 12:47 PM Post #2 of 5 (3209 views) Re: 2000 Pontiac Grand Prix GT Sign In With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If they are both hot, the heat in that vehicle is controlled by a blend door that regulates heated air flow. it is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. thealien707 New User Nov 18, 2011, 2:31 AM Post #3 of 5 (3177 views) Re: 2000 Pontiac Grand Prix GT Sign In Are there any more simple things it could be before I decide to tear out my entire dash? Tom Greenleaf Ultimate Carjunky / Moderator Nov 18, 2011, 4:29 AM Post #4 of 5 (3176 views) Re: 2000 Pontiac Grand Prix GT Sign In Might be low on coolant. If so find the leak that could be anywhere coolant (antifreeze mix) goes, T Hammer Time Ultimate Carjunky / Moderator Nov 18, 2011, 11:47 AM Post #5 of 5 (3166 views) Re: 2000 Pontiac Grand Prix GT Sign In Quote Are there any more simple things it could be before I decide to tear out my entire dash? Nobody suggested to tear out any dash. I gave you ways to isolate the cause. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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