Is my heater working normally?

[Sam27]

My CUCV pickup makes very little heat it seems. I paid attention on a 25 minute drive last night and the air coming from the heat ducting was maybe 70 degrees. I'm not sure if something's broken, or if diesels just run this cool.

Wish I had a temp gauge.

 

[85-m1028]

That doesn't sound right my heater can get the cab nice and cozy warm!! You most likely have a thermostat stuck open or maybe the heater core is plugged up? Check the heater core return line temp.

 

[mangus580]

I have the same problem.... first things first... put a new tstat in... DONT buy one from the 'cheapo' parts stores. They claim to have the right one but they dont. Go to NAPA or a dealer. It should cost plus $25 or so.

 

[Armada]

Check the coolant level in the radiator. Low coolant will not let the heater core work properly.

 

[Katch1]

as warm as it was last night sam, you should have had very warm air, definetly check your t-stat. Could a temp gauge be added?

 

[texas-5-ton]

I'd say the heater core could possibly be stopped up. If you've ran any radiator sealer or "stop leak" in your radiator, this might be your problem. I have dealt with this problem several times in the past and it just needed to have the "junk" flushed from the core. Hope this helps.

 

[Hasdrubal]

Just dealt with this same issue. Failed thermostat, what should have been an easy 2 bolt job turned into an all nighter as the lower bolt sheared off. Nice to have heat in this weather!

 

[Sam27]

Thanks for the replies, I'll try the thermostat first, then maybe some flush. I plan to add a temp gauge soon, just not sure where to put the sender yet.