Car gets hot with ac lever on cold?

[Turbo Zach]

All good advice here. Every one covered anything I could think of.

 

[pontiacgp]

All good advice here. Every one covered anything I could think of.

 

[MrSony]

Did you hook up the ground that goes to the heater core?

yes.

 

[MrSony]

Heater core is made of aluminum, and is new. What would a temp gun solve? To see if there is still coolant flow behind the heater valve?

Check the ground issue to see if it is causing a parasitic temp gauge increase. To me it seems like something with the heater core and/or heater hoses. Double check that the hoses are set up for correct flow. Then check the heater valve and it's vacuum connection. I haven't went back to check ealier post to see if the core is new or what it's made out of. As for the radiator what did you refernce to which one you needed? If that is the issue look into a SBC 350/HD cooling listing. Rock Auto does have that new vender with all aluminum radiators that should fit like an OE unit. Closing of any interior heater door for hot or cold air should not affect engine temp unless one of those vacuum circuits is connected wrong.

The radiator is just a cheapo v8 g body replacement radiator. I still can't wrap my head around a ground issue being the cause of the temp swing, ONLY when I do a specific action. I'll check out those rock auto radiators. The only g body that had a 350 were the mexican montes, as far as I know. I could get a diesel radiator...
I found these for a 5.7 diesel cutlass... https://www.rockauto.com/en/catalog...8+diesel,1222681,cooling+system,radiator,2172
2 or 3 row?

 

[MrSony]

Check the ground issue to see if it is causing a parasitic temp gauge increase. To me it seems like something with the heater core and/or heater hoses. Double check that the hoses are set up for correct flow. Then check the heater valve and it's vacuum connection. I haven't went back to check ealier post to see if the core is new or what it's made out of. As for the radiator what did you refernce to which one you needed? If that is the issue look into a SBC 350/HD cooling listing. Rock Auto does have that new vender with all aluminum radiators that should fit like an OE unit. Closing of any interior heater door for hot or cold air should not affect engine temp unless one of those vacuum circuits is connected wrong.

All the vacuum lines seem correct, grey to heater valve, black from engine to ball, purple from ball to interior controls.

 

[pagrunt]

The only g body that had a 350 were the mexican montes, as far as I know.

'78-'80 wagons & Elkys.

 

[MrSony]

Cant seem to find a heavyduty specific radiator just the standard aluminum replacements.

 

[fleming442]

A few thoughts: have you ever replaced the fan clutch? Ever think about electric fans? If A/C is not in the future, pull the condenser because it is blocking some flow through the radiator.

 

[pontiacgp]

What would a temp gun solve? To see if there is still coolant flow behind the heater valve?

I expained it back on page 2, it will verify the temperature of the coolant so you can check to see if the gauge premature is correct

 

[TURNA]

I expained it back on page 2, it will verify the temperature of the coolant so you can check to see if the gauge premature is correct

Not to mention they are just a great tool to have. Especially since they are fairly cheap these days