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I have 2002 Volvo s40 when I start the car and let it worm up the heat works but when I start driving it just blows cold air wat could be the problem

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  • Volvo Master
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Thermostat needs replaced

Posted on Apr 30, 2015

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6ya6ya
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Posted on Jan 02, 2017

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motor1258
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SOURCE: 2002 caravan, heater problems

That was a common complaint a few years back, due to the fact that the heater core is a little too much higher than the engine, which requires that extra push it gets when engine RPM's increase. One thing I did do on my Caravan was remove my hoses to the heater core, and use a small external pump with hoses to circulate C.L.R. through my core for a while, then let it sit with CLR in the core overnight.Next day I circulated it through again, both ways by reversing hoses, and then re-attached hoses, bled air out of system, and notice quite an improvement in heat at idle. Once cleaned out, the heater core allowed coolant flow through it better at idle. If your stumped by explanation, take it to an automotive shop, or a Rad shop, and get a quote on flushing that core out for you. I recommend the CLR, but it might be too time consuming for you , but a flush will probably show some noticeable improvement.

Posted on Nov 23, 2008

dgjtex
  • 405 Answers

SOURCE: After car heats up (slow to heat) it stil blows cold until moving

http://www.fixya.com/cars/t1386554-91_ford If this doesn't help you tell me more, if it does, please vote me fixya, otherwise please do not give me any rating at all, the only compensation I get is my Fixya score, Merry Christmas.

Posted on Dec 22, 2008

  • 1 Answer

SOURCE: radio display reads off for 2002 s40 volvo/cd player wont work

Hello there. I have a Volvo V70 that I bought recently and it had the same problem. I left the ignition switched on for about two hours and after that time the reading had changed from OFF to Code. I then entered the code and Hey Presto It worked. When I purchased the car it too had no code. I went to a Volvo Dealership, with proof of ownership of the vehicle i.e. Log Book and proof of ID , I used my Passport, and they gave me the radio code.The only dowside was I had to pay them £10 for this code but I feel it was worth it. I suggest you try this too. Good Luck.

Posted on Jun 17, 2009

roniecon
  • 6826 Answers

SOURCE: The AC fan in my car (volvo s40-99) does not work

If you are talking about the blower motor fan,inside the car,look for a blown fuse,or a bad fan relay.The blower motor relay could be mounted near the blower motor,or in the relay box,look for the lables to guide you to it.If the relay,and the fan are fine,then replace the blower motor.

Posted on Nov 06, 2009

  • 452 Answers

SOURCE: Car Heater Not Working - Blowing Cold Air

also check to see if tube that runs your climate door is not pinched or broken. the vaccum tube that runs the climate door is behind and under the battery. i had same problem a year ago and the tube was partially cut. i fixed it by cuttinga piece of aquarium tubing and spliced it back together. one other thing.....check to see if your radiator over flow cap is tight. your cap maybe bad and or cracked this would also cause the problem.

Posted on Jan 29, 2010

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Hi nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn


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