Mechanics

WHY WONT MY HEATER IN MY BLOW HOT AIR

1994 Volvo 850 • 150,000 miles

Ac wont work and heater dont blow hot air?
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Jonsmith8608
February 16, 2012.



Hi
either a blend door is not working or a heater control valve under the hood located in heater hose is not opening. Move heat selector to hot and at the same time look under the dash and see if you can see a blend door open and close. You may see the lever move and door not open. If so lever has disconnected from door.

Billymac
Feb 16, 2012.
Where is the hose located under the hood could it also be because there is water and not antifreeze in system

Tiny
Jonsmith8608
Feb 16, 2012.
Well should have 50/50 mix of coolant. However as long as it is getting up to atleast 180 degrees should still heat. If you follow your heater hoses from your engine to your firewall there should be a heater valve mounted in one of the hoses. But most important make sure both hoses going into car are hot. If yes then the problem is past that inside the car which will be a heat door not opening

Billymac
Feb 16, 2012.
AND when I start car and turn key it like doesnt catch to turn engine over

Tiny
Jonsmith8608
Feb 16, 2012.
When it does this is there any noise, like grinding clunking or just nothing.? Also when you get it to start what do you have to do to make it crank?

Billymac
Feb 16, 2012.
It like kinda a whining noice like something spinning but nothing catching and to make it turn over I just take key out and turn it really slow

Tiny
Jonsmith8608
Feb 16, 2012.
Ok this sounds like a bad starter solinoid or starter drive. What is going on is the ignition is spinning the starter but not kicking the starter drive forward to engage with the flywheel.

Billymac
Feb 16, 2012.
How would I b able to troubleshoot it to see which one it is

Tiny
Jonsmith8608
Feb 16, 2012.
Normally you would replace the starter, but if you want to repair that one replace the starter drive and the solinoid starter must be removed and dissassembled for this

Billymac
Feb 16, 2012.
So the silinoid and drive are in the starter?

Tiny
Jonsmith8608
Feb 16, 2012.
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