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What else could be causing my car to overheat?

sashaa35sashaa35 Member Posts: 2
edited March 2015 in Buick
2003 Buick Rendezvous CXL. Just replaced the thermostat, cooling fans are working, I have no heat/ac air inside car and it still seems to be overheating. from the C to the H their are 3 lines mine tends to hit that 3rd line in just a matter of minutes. So is their a fix? and why do you think my ac/heat does not come on? Are the problems related?
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    ray80ray80 Member Posts: 1,655
    When the T-stat was replaced was the air in system propely bled? If not that can cause no heat condition and possibly overheating
    (potential for blown headgasket also if it had been driven when overheated)
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    Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    No heat suggests low coolant level or air trapped in the cooling system. I would bleed the cooling system and double check the cooling fans for proper operation. Also, such a quick overheat might suggest a complete blockage or a head gasket problem.
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    sashaa35sashaa35 Member Posts: 2
    Ok thanks guys, can you give me some step by step instructions on how to bleed the air system?
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