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check coolant level first. possible bad thermostat, blockage, heater core is bad. check to see if a hose going into heater core is hot, if the hose is hot and the other is cold you have a blockage in heater core. if so, sometimes you can remove the hose from heater core and flush it out with a garden hose. if above fails, flush whole system.
If the temp gauge is hot and cold air is blowing in the passenger compartment, then I would say there would be a blockage or series of blockages in the cooling system. Flush it out and refill with new antifreeze/coolant mixed at 50/50 water to coolant concentration.
Check the codes to see what else may be wrong with the engine.
just because the gauge seems normal doesnt mean the thermostat is good, its 5 years old,and may be opening to soon, i would start by having the t-stat replaced and while thats being done have the cooling system flushed including a flush off the heatercore. i ve worked on a couple of these vans with heating problems, most were low on coolant due to a slow waterpup leak, the others with half plugged heatercores, due to the lack of coolant flushes. hope this helps.
Firstly check the coolant level when the engine is cool. If fluid is at correct level then more then likely thermostat is stuck open. Have coolant system flushed before installing new thermostat. Also check water pump to make sure it is not leaking out of the weep hole.
ok, i had the same issue, your thermostat is stuck open, or you need to check cooling system and the color of coolant, maybe try a flush, go to parts store and get some acid cleaner for flushing your cooling system.....good luck!
it sounds like the heater core is clogged bad if u know someone with a air compressor put a air nossel on it that you pull the trigger to blos air in to the heater core after you take the lines off i had to do this before on a jeep cherokee it did the job
they radiator flush has created a blockage in the heater core that creates the heat. you dont want to replace this part because it can get $$$$. i would take it back to the shop and have them try the service again( at no charge) to see if it can remove the block
sounds like you may have an air bubble trapped. Try loosening the radiator cap & running the engine at 1500 rpms till the thermstat opens & see if you can "burp" the air out. You may lose a little coolant this way. shut off car & recheck coolant in radiator and reservoir bottle. Just because reservoir is full, doesn't mean radiator is full.