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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   2006 Toyoto Camry XLE Driver Side Electric Window Trouble Hello, Looking for a little brain help ...   Tierod end change caused some kind of leak Hello so I just took my car to the nearb...   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...   Howdy     Just wanted to s...   ABS/Tractiob/Brake Lights on But No DTCs Hello all, Recently while driving m...   Chevy strut replacement I'm trying to get a sensor of some kind ...

Search Auto Parts Search Heater throws cold air while on the highway Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Car Troubleshooting kwswamper New User Jan 16, 2011, 7:38 AM Post #1 of 4 (1730 views) Heater throws cold air while on the highway Sign In 1999 Jeep Grand Cheerokee Limited 4. 0 L 170,000 miles- When setting at idle heater seems to work normally. When on the road only cold air received from air outlets. Everything seems normal. Water level,radiator cap etc. Sidom Veteran / Moderator Jan 16, 2011, 12:57 PM Post #2 of 4 (1717 views) Re: Heater throws cold air while on the highway Sign In I would start with the basics. You've already checked the coolant level. Next you would want to make sure the T stat it working properly. Pull codes & see if there is a P0128, that would be a indication of a bad stat. If you don't have a code puller just cycle the key from off to the run position (without starting) 3 times and the codes should be displayed in the odometer. If all that checks out the next step would be to make sure no exhaust gases are getting into the cooling system. The system would need to be block checked for this..... kwswamper New User Jan 17, 2011, 6:36 AM Post #3 of 4 (1707 views) Re: Heater throws cold air while on the highway Sign In We have discovered since placing this post that heat does emit from the passenger side, but not the drivers side. I am speculating there may be a door somewhere not opening properly.Next I guess would be to gain some knowledge as to how to reach the bad door or door control. Any ideas? Hammer Time Ultimate Carjunky / Moderator Jan 17, 2011, 9:10 AM Post #4 of 4 (1704 views) Re: Heater throws cold air while on the highway Sign In Does it have separate left and right temp controls? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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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