83 gmc truck no heat - AC Auto Repair Help Forum


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83 gmc truck no heat

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jkkennedy
New User

Mar 2, 2010, 1:26 PM

Post #1 of 4 (2305 views)

83 gmc truck no heat	Sign In

Hello I have I 1983 gmc c1500 truck 5.0 engine I have all of the hose hook up and took of the the heatercore to see if maybe plug blow on one end of hose water came out easy you turn on the heat and the thing blow warm for just a min and then cold air comeing out of it let truck run for 30 min felt the water in the rader it was just warm not hot.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 2, 2010, 4:47 PM

Post #2 of 4 (2301 views)

Re: 83 gmc truck no heat	Sign In

Coolant must be full at radiator and can take a cycle or two to burp out air after being open. Is heater truly cold or just lukewarm? From cold, upper radiator hose should stay cold to the touch till engine approaches the thermostat's rating, typically about 195F for this engine.

If the hose warms up early then the thermostat is letting coolant pass too early to be cooled when already not warm enough,

T

jkkennedy
New User

Mar 3, 2010, 9:13 AM

Post #3 of 4 (2292 views)

Re: 83 gmc truck no heat	Sign In

The radiator is full and the heater is truly cold just put a new thermostat that is a one 195f thinking maybe this is what it was but no still cold air no heat at all check the bypass door it is hook and working so that not it so what to do next

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 3, 2010, 10:27 AM

Post #4 of 4 (2290 views)

Re: 83 gmc truck no heat	Sign In

Does your temp gauge stay steady? Are heater hoses at least warm. Should be about too hot to touch - careful. I think temp blending (for heater) is mechanical (cable) but can't be sure on this one. Rare but there are water pumps that will be directional and wrong or impellers not up to snuff,

T

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