Question about 2001 Volkswagen Jetta TDI

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Over heating no warm air heater

Over heating, after 5 miles no warm air heater

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Your thermostat it is sticking closed and needsto be replaced.

Posted on Jul 15, 2009

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Posted on Jan 02, 2017

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1 Answer

Heaters slow at warming up


In normal circumstances the heater wouldn't begin blowing warm air until the vehicle has travelled 5 miles - call it 5 minutes. That's because the thermostat only begins to open at around that mileage/time and allows coolant to circulate around the engine. Before that - there just isn't any warm coolant in the heater matrix.

After 10 miles/10 minutes of normal driving the engine will be at its correct operating temperature and the coolant will be hotter - as will the circulating coolant in the heater matrix. That's when the heater blows the hottest air.

If you're sure that the heater has lost efficiency it may be due to air being trapped in the heater matrix/coolant system, or a blockage caused by limescale/engine corrosion within the heater matrix itself.

To remove any trapped air, set the heater to maximum, remove the radiator cap/coolant bottle cap and let the engine tick over for 10 minutes.

If the heater matrix is blocked/partially blocked, drain the coolant system, refill with plain water, set the heater control to open .. and let the engine tick over for 10 minutes. Drain it again.

Refill again with plain water and add a can of 'radiator flush'. Follow the instructions on the can of 'radiator flush'.

Drain again and refill with coolant/water.

If the heater is still inefficient then the only option is to replace it - and that's not an easy job.

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1 Answer

I have a 2007 Saturn, Aura. Heater does not blow hot, slow coolant leak, & it also over heats. Please help! I'm freezing when I'm in my car!!!


You need to fix the coolant leak, then refill and bleed cooling system, then you will get heat and cure overheating problem too

Dec 16, 2015 | Cars & Trucks

1 Answer

Long time before heater blows warm air


That seems pretty normal, the heater works by blowing excess heat from the engine coolant. So the coolant has to be warmed completely for the heat to work, you can get a heater that plugs into your cigarette lighter that will heat the vehicle instantly.

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1 Answer

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Have your thermostat checked, sound like it is not working when cold.

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2007 corolla does not give off heat, blows cold. temp shows correct range, heater core hoses hot to the touch inside and out, radiator hoses hot and fluid is sufficient.Would thermostat be at fault even if...


there should be a temperature door, but I don't know if there is a cable or if its electric. turn the temp knob, if it feels like it moves anything? I dont have a diagram here at home, but will monday/

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1 Answer

Heat/Cool gauge fluctuates inconsistently


You might check the coolant level after the engine cools,if it's low add 50/50 mixture of coolant and water. Keep an eye on the level to see if it happens again. You might have a small leak in the system. Good luck


Jan 18, 2010 | 1998 Volvo S90

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BMW E35 95, no heat coming thru vents


check the hoses going through the firewall to the heater assembly,they should be hot.there is a vacuum controlled assembly driven by the climate control assembly.check the vacuum and the cables

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1 Answer

No heat


Sounds like one of the fancy heaters. They have circuit boards that can go bad. don-ohio

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Heater blowing cold air


My 05 sentra with 79k miles heat will warm up and then get cold after a mile of driving, we have tried to get the air pocket out, the mechanic stated he thought it could be a blown head gasket, another mechanic said it was a bad heater core. Any advice would be appreciated.

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1 Answer

Heater problem


it could be that the heater is air locked. joe

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