Heater blows cold air


Asked by Dec 27, 2014 at 11:10 AM about the 1991 Nissan Pickup 2 Dr STD Standard Cab SB

Question type: Maintenance & Repair

1991 Nissan pickup tempeture gage moves only slightly above Cool after extended idle,and drops below Cool while driving. Meanwhile the heater never rises above luke warm at the vent.

2 Answers


Sounds like the thermostat to me.


Stuck open therm can cause this sort of issue. Stopped up heater core can also cause it. Locate the two heater hoses under the hood going into your firewall right below the front windshield. Crank truck up and allow it to run long enough to reach operating temp. Now carefully feel these two hoses. Is one hot and the other cold or luke warm? If so possibly stopped up heater core. Is both luke warm or cold? If so possibly therm stuck open.

Your Answer

Add photo

Related Questions

Search Nissan Pickup Questions

Nissan Pickup Experts

#1 beater
Reputation 150
#1 dandyoun
Reputation 150
#3 Boats
Reputation 130
View All

Related Models For Sale

Used Nissan Truck"
120 listings starting at $4,650
Used Toyota Pickup"
123 listings starting at $2,999
Used Ford F-150"
3,271 Great Deals out of 216,769 listings starting at $1,000
Used Ford Ranger"
271 Great Deals out of 7,819 listings starting at $988
Used Chevrolet S-10"
9 Great Deals out of 1,813 listings starting at $1,749
Used Dodge Dakota"
168 Great Deals out of 4,811 listings starting at $900
Used GMC Sierra 1500"
1,061 Great Deals out of 56,419 listings starting at $2,400
Used Nissan Pathfinder"
487 Great Deals out of 25,028 listings starting at $1,500
Used Toyota 4Runner"
388 Great Deals out of 18,866 listings starting at $2,400