1993 chevy Silverado 4.3l xcab c1500 low heat problem

[Bob252]

My heater barely works but my temp is 195° the heater hoses seem to be at about the same temperature. No over heat problem present. Coolant level is good. But the heater just won't blow hot. This has been a problem for years but lately the temperature outside has hit record lows. Please help. 😩😩😩😩😩😩😩😩

[b454rat]

Heater core is prolly plugged. Pull lines off, blow air thru the return side of the core.

[Bob252]

Did that. No change. Still only luke warm air coming out.

What mechanisms makes the cold air hot?

If there is a door that controls this. Where is it on a 1993 chevy truck?

[b454rat]

There is a door in there that controls air flow. Not sure how it works or where it is. Guess I've been lucky with the pre-95s that the heat works lol.

[mountie]

There is a door to allow heat to enter cab. located, sort of below / right side of radio. access by removing glove box..... to left of glove box opening....

Also ...maybe your heater core is covered with leaves & junk. The stuff that wiggles it's way down from the vent, at bottom of windshield.

( When I replaced my A/C, I found my heater core covered with crap )

( My '88 Sierra )

[ninety6]

not really a lot to getting heat --- suggestions above will hopefully get you going. Its going to be either not enough hot coolant getting to/through the heater core (bad t-stat or clogged core or line), or the air going through the vents isn't going across the heater core due to a blend door issue, or as suggested, maybe even leaves!

[diveplane]

Originally Posted by b454rat

There is a door in there that controls air flow. Not sure how it works or where it is. Guess I've been lucky with the pre-95s that the heat works lol.

called actuator flap controls all 3 modes in vent, sometimes the mechanism sticks ,some wd40 does the trick.

like someone mentioned heater core could be plugged up, or a hose but that in return would over heat your truck as well.

[diveplane]

my 94 this flap unit is drivers side under dash.