I haven't had any heat in my truck and with this cold weather I really need to get it fixed. It blows air, but it isn't warm at all. Any suggestions?

 

Plugged heater core.

Reverse flush first, and see if that helps any.

RwP

 

Ralph, not to seem like im stepping on any toes here, but if it has gotten to the point where it doesnt even get warm, reverse flushing will very likely not work. I know, because i had that issue on all 3 of my trucks last year. Another thing to check though, since i cant remember which ones did and didnt have them, is to look in the heater lines for either a mechanical or vacuum actuated shut off. They shut off the heat when you use the A/C, and are known to stick closed.

 

If the reverse flush works, then the OP has a cure.

If it DOESN'T, the OP has expended about $0 and a bit of time.

It's always a good first shot for a non-leaking cold heater.

And *ahem* IMPE, a reverse flush followed by a flush followed by another reverse flush has worked 100% of the time. YMMV, natch.

RwP

 

That's assuming it hasn't been bypassed Last three trucks I've bought (2 Daks, 1 GMC), previous owners had bypassed a leaking core. I broke down and replaced the one in my '90. Wasn't as bad as I thought it would be.