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Astra heater my astra heating works for a few seconds but then goes back to cold

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Need to replace your AC & Heater control unit..it is not reading correct temperature and shutting itself down...but that being said try flushing your heater core first...

Posted on Apr 26, 2013

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Posted on Jan 02, 2017

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SOURCE: The heater in my 2002 Fort Taurus only works for a

Check to make sure your coolant is full. If it is carefully feel both of the hoses near the firewall that go to the heater core. Be careful the exhaust is right there and its HOT.
With the heater on both hoes should be about the same, if one is colder than the other you heater core is partially clogged and will need to be replaced or a shut off valve in the hose is not opening properly. I use a infrared digital thermometer so I don't have to reach in to check the temps.
Good luck
Lee

Posted on Nov 29, 2010

  • 323 Answers

SOURCE: Low heat condition. Heater goes from hot to cold

A low coolant level can cause this problem. If the coolant is low, look for a leak around the waterpump area. If the leak isn't severe you can just top it off as needed until you have the time and/or money to have it fixed.

Posted on Oct 15, 2009

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SOURCE: heater does not work

Seems like very little volume of water is reaching the heater core in the dashboard. Check the hoses that run from the cooling system into the firewall. One of these hoses might be bent or creased in a position that it impairs the normal flow of hot water into the dashboard.

Posted on Dec 13, 2009

  • 40 Answers

SOURCE: I am having heater issues....

There could be several causes for this.
The first thing I would check is to make certain that the coolant level if filled properly. Low coolant levels can contribute to this, at idle the coolant will not be circulating properly leading to not enough coolant going to the heater core.

Secondly, either your heater core or radiator may have slowly over time become corroded and is restricting the coolants moment through the engine and as your engine gains "RPM's" the coolant is circulated faster.

There is an outside all be it small chance that the water pump maybe failing also.

I would first check to make sure there is a proper amount of coolant in the reservoir, if it is full or close to it I would then check to see how the circulation of coolant differs from idle to under engine acceleration.

Posted on Nov 09, 2010

Testimonial: "I think your right! thats the good news. The bad news is i got a leaky radiator. my day off tomorrow. looks like i'll be workin on that. Thank you!"

bluebirdmate
  • 1190 Answers

SOURCE: after running for 20 minutes or more , the heater

Hello: Check the coolant level, fill up the reservoir and run truck, if reservoir shows low again fill it back up. If reservoir was low/empty the check for leaks. Do this before you replace thermostat. The heater core would not create this kind of condition.

Posted on Feb 09, 2011

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05 saturn ion, ecotec, left/driver side radiator hose stays cold, doesn't over heat, and heater works great , new water pump and thermostat ,and head.


in cold weather with the heater on the engine will not get hot as the cab heater will keep the engine cool enough ,turn heater off and run engine at 2000rpm untill thermostat opens and fan comes on a bit later ,check it out before you use the car .Any problems answer this post so it comes back to me via E mail.this car is the same as a opel astra in europe .

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When I put the heat on in my car it blows warm air for a few seconds then goes to blowing out cold air.


The lack of heat in the car has little to do with the car's cooling system, other than the hot coolant is the heat source. 95% of all "no-heat" issues are related to heater controls and/or the heater core itself. Since you get some heat, and then it goes away, this indicates a probable vacuum leak in the heater controls. When you select heat, vacuum is directed to a vacuum motor. This motor operates a vacuum actuator that moves a linkage that moves a door inside the heater box to direct the interior air through the heater core. If this actuator has a leak, it will activate, then as the vacuum leaks off, deactivate. You probably need to have a part replaced in the heater actuator mechanism.

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1 Answer

No heat dont switch to heat


Depending on the vehicle. There are a number of things to check. First check your fuses. You may have a bad heater control, a vaccum leak (depending on make and model of car) a short in the wiri g or a bad servo that switches from cold to hot. But first let the car get to operating temperature with the heat and fan completely of after the temp gauge goes up turn the heat on hot and the fan up. If it blows hot for a few seconds then back to cold then you need a heater core flush or heater core replacement

Nov 08, 2014 | Cars & Trucks

1 Answer

The temp gauge on my 2008 ram 1500 jumps from normal temp to hot checked engine the temp is fine my heater them puts out cold air and I have no heat if I shut heater off and wait a few minutes temp gauge...


It probably low on coolant. The heater will blow cold when there is not enough water (coolant) to keep the heater core full. Check the radiator (not the overflow reservoir) when it's cool.

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1 Answer

Heaters blow cold on my vauxhall vectra


I have a astra the same thing ,when its really cold i slide a piece of cardboard in front of the rad ,yes i know i changed the thermostat behind the timing cover and it should get hot but?? bled the top heater hose and all that but for some reason it will not get hot .The only other thing i do when the weather get cold is to fit a renault thermostat in the top hose ,one of the old renault 4 /5 type that goes in the pipe but as this spain it doesnt get that cold very often .You could try removing the pipes to the heater and flushing with a hose pipe and reversing the direction a few times but if the engine isnt getting hot to start with then thats most likely your problem .

Nov 12, 2012 | Cars & Trucks

2 Answers

Heat intermittently working Nissan Altima 2002


you may have a sticking thermostat make sure you have enough anti-freeze in it and it does not have a air bubble in it give these websites a try www.alldatadiy.com and www.autozone.com if all fails stop by your local library and get your hands on a Haynes auto repair manual for your car wish you the best of luck Michigan Man.

Feb 02, 2010 | 2002 Nissan Altima

2 Answers

2005 RX8 heater is blowing cold air. Fluids are topped up.


You need to repair the heater core with a soldering gun.

If you do not have heat, or only have heat, IMHO it is most likey the AC/heater control unit. This is the part which has the AC/heat control buttons and knobs.

Easy Diagnosis:
The easiest way to verify this is to turn on the radio, press and hold the power on/off button and press and hold the scan-up button for a second (full second). The word "A/C TEMP" should appear on the left of the display and a number from 0 to 16 on the right. I suspect yours will have the number 0 (or 16 if heating only problem) displayed no matter where you turn the temperature control knob. If this is the case you could turn the temp. knob to full heat and see if it goes to 16 after pushing down or to the right on the knob.
In a working system, the number moves evenly in increments of 1, from 0 to 16 as you turn the temperature knob.

Easy Fix:
I was able to take mine out and solder 3 loose connections to fix it.

The beginning steps are the same as for any radio removal procedure and check for loose connections.

Dec 14, 2009 | 2005 Mazda RX-8

1 Answer

What could cause the heating to pack up in my 98 corolla?


Try it again today, if no heat, move back & forth from cold to hot, and bang with hand, under dash on passenger side where heater duct work is and wait a few seconds. Blend/air door may be stuck.

Jan 25, 2009 | 1998 Toyota Corolla

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