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Search Auto Parts Search Heater Broken / Overheating Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum brewmvt New User Nov 16, 2005, 11:17 PM Post #1 of 4 (2853 views) Heater Broken / Overheating Sign In Vehicle : 1993 Nissan Pick-up truck Miles: 190,000 Okay, so my truck has been overheating and I have replaced my thermostat, waterpump, fanclutch, and radiator. I even hooked up a hose to all my different parts of my trucks cooling system to make sure there was correct circulation (ex. hose to the heater core). I have used a flush system to clean out my cooling system, no help. The only thing that I can say is that my heater doesnt work,(most of the time). A/C works great(untill overheating). So what could be the problem? Thanks! DanD Veteran / Moderator Nov 17, 2005, 5:21 AM Post #2 of 4 (2848 views) Re: Heater Broken / Overheating Sign In With everything that you have done I think the next thing would be to have someone or yourself do a block test on the engine. It only takes a couple of minutes to do the test and it will tell you whether there is any combustion gases in the cooling system. If there is then you may have a blown head gasket or cracked cylinder head. The tester kit is available at most parts suppliers and I think it’s less then $50. to buy. Here’s a couple of pictures of what some styles of kits looks like. The liquid that you pour into the tester starts out blue and if it turns even the slightest yellow once you’ve drawn the fumes from the rad through it, you’ve got some form of combustion chamber leak. Dan. Canadian "EH" brewmvt New User Nov 18, 2005, 1:46 AM Post #3 of 4 (2835 views) Re: Heater Broken / Overheating Sign In Hey thanks for the feedback, I will try that! I still dont know why my heater doesnt work sometimes, maybe a seperate issue that happened recently? Tom Greenleaf Ultimate Carjunky / Moderator Nov 18, 2005, 9:10 AM Post #4 of 4 (2826 views) Re: Heater Broken / Overheating Sign In As Dan showed with graphics, I will add that your heater will NOT throw out heat when you have air/exhaust gases, or just bubbles from boiling over! It sounds strange but heaters quit when you overheat enough. That and the potential damage to your engine means this should be taken care of yesterday!! I'll go one step further and say change your oil a couple times early after you're fixed up. - T   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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