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Search Auto Parts Search 99 Blazer heating problems Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum sonordrumr User Jan 6, 2008, 10:49 AM Post #1 of 5 (2011 views) 99 Blazer heating problems Sign In Tom, Thanks for the reply. Yeah, my model doesn't come with a cabin air filter and the vehicle isn't exposed to any harsh elements such as pine needles. I may have some dust and dirt in there though. Who knows what could get in those diverter doors? I wonder if I've still got some air in the system? I thought for sure I found the problem when the reservoir was blocked but soon after the cold/lukewarm returned. There is a threaded bolt in the thermostat housing that has me wondering. Is that for bleeding the system or what is it for? I took the reservoir out the other day to clean it out. Would that constitute bleeding the system again to rid the system of air? Tom Greenleaf Ultimate Carjunky / Moderator Jan 6, 2008, 11:08 AM Post #2 of 5 (2009 views) Re: 99 Blazer heating problems Sign In That plug in t-stat housing could be for a sensor you don't have. It's after the t-stat so really shouldn't be the spot to let air out but if you want to try, go for it. If you take radiator cap off it should be full to spilling if it's been a while since filled properly. If there's still room to add coolant there fill it up as it should purge out to recovery tank and only be able to draw liquid back in - self bleeding in time. What engine is in this? I have a 5.7 myself and it's not fussy about an air lock. Do check the cap and level again. The cap should maintain pressure when warmed and you can feel that in upper hose right there. When it cools the little dime flapper under cap opens and allows fluid back in. I'm guilty as all hell for not replacing caps as much as I should and they do cause problems. I clean them all the time though and use silicone grease on the rubber parts (two) so they stay working a long time. This could be the trouble and shame on me for not thinking of it!!!! T sonordrumr User Jan 6, 2008, 11:35 AM Post #3 of 5 (2008 views) Re: 99 Blazer heating problems Sign In My engine is the 4.3 litre V6 Vortec. 231 cu. in. I think. I just replaced the cap when I replaced the water pump and heater hoses. Seems to have plenty of pressure on upper hose. Tom Greenleaf Ultimate Carjunky / Moderator Jan 6, 2008, 11:48 AM Post #4 of 5 (2006 views) Re: 99 Blazer heating problems Sign In Ok: That engine is a 5.7 with 2 cyl cut off - really! If rad is staying full that isn't it. It still could hold pressure but not seal at the unsprung gasket and purge out air or coolant there and not pull back just coolant. I'm still thinking T sonordrumr User Jan 6, 2008, 12:12 PM Post #5 of 5 (2004 views) Re: 99 Blazer heating problems Sign In A leak at the thermostat gasket on the housing? Or a bad t-stat?   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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