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Heater blows cold air and the temp guage is in constant flux

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Heater blows cold air and the temperature guage reads cold after driving for 20 minutes


Best case scenario is your thermostat is stuck open. When this happens the engine will take a long time to warm up and will never get up to full temp. Worst case could be a serious problem such as a blown head gasket. If there is no coolent in the engine the temp gauge will not register either.

Dec 15, 2013 | 1999 Ford Explorer

2 Answers

No heat blowing from vents


1st check fuse to the heater
2nd check relay
3rd the filament wire of the heater

Dec 09, 2013 | Volkswagen Jetta Cars & Trucks

3 Answers

No heat blowing cold air.


Do you smell coolant inside of the vehicle. If so then chances are your heater core is going.

Nov 23, 2013 | 1997 Ford Contour

1 Answer

What does it mean if the heat is blowing out cold air?


a list of things to check
1) check both heater hoses coming out of the firewall to see if both are hot, if one is cold try flushing out the heater core, than do a back flush, if that dont work check temp guage on the dash, temp guage is low, change thermostat, check for coolant leaks

Oct 03, 2010 | 1998 Chevrolet Blazer

1 Answer

2002 cavalier overheats but heater blows cold air


check your coolant level. if it is low you will not have heat and also causing the vehicle to run hot.

Jan 05, 2010 | 2002 Chevrolet Cavalier Coupe

1 Answer

Blows only cold air. guage on dash shows engine


chek the valve out side heater hows at fire wall

Dec 10, 2009 | 1996 Chevrolet K1500

1 Answer

1995 GMC suburban temp guage pegs high, but heater


Sounds like there may be an air pocket in the system.
Try 'burping' the system. If this still doesn't fix the problem, check the temperature of the heater core hoses (in and out) The inlet should be fairly cool, the other should be piping hot. If they're both cold; the heater core has an internal blockage.

Next, replace the thermostat with a winter (180-195 F) derivative.
Bleed the system accordingly, and keep me posted!

Nov 30, 2009 | 1990 GMC C2500

2 Answers

Temperature gauge fluctuates and the heater blows cold air


Definitely check your fluid level in your radiator. Top it off all the way. I've seen that happen multiple times on cars that were low on anti-freeze. If that doesn't work try replacing your thermostat. It's cheap and the easiest place to start if topping off the fluid doesn't get you fixed up.

Oct 16, 2009 | 1997 Chevrolet Camaro

2 Answers

Ford mondeo mk3, intermitent dumping of water from cooing system,found crack in header tank, changed same,ran car at idle, temp guage at normal & heater blowing hot , took car for run , temp guage off...


You may have an air pocket in your system which some times happens.  One way to get rid of it is to take the upper hose off on the engine side,  fill your system with water until it runs out from your engine block, replace the hose, start your car turn you heater on and set to hi keep the radiator cap loose until the temp start to rise then close tight.  Once the air pocket had been remover you can drain some of the water from the radiator using the lower drain plug and add antifreeze.   

Mar 09, 2009 | 2001 Ford Taurus

1 Answer

2005 MALIBU - HEATER BLOWS BUT NO HEAT


could be vaccum leak in the a/c panel where the flappers open and close to allow hot and cold air to blow

Jan 02, 2009 | 2005 Chevrolet Malibu

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