Post by 71se3834v on Jul 25, 2021 9:13:39 GMT -5
So yesterday was probably the hottest most humid day that I've run the car on the highway with the AC on....
A little back history: 2014 engine was rebuilt pretty much stock specs, bored .030 over. Radiator recored with extra capacity. New thermostat 180*. Still running the stock fan and original fan clutch. Temp would run 190* and if I made some hard runs from a stop it would climb to 195*. If I was stuck in cruise traffic on a mid 80's day it would climb to a tick over 200* but if I popped it in neutral and increase the rpm's it would come back down.
2016 got the AC up and running. Naturally the temp would run 5* or so warmer but nothing to be concerned about. Bare in mind the temps I'm sighting are from an aftermarket gauge. Two years ago made a 1 3/4 hour run to a weekend car show, fall temps (mid 70's to low 80's?), air on with no problems.
Ok, yesterday mid 80's, high humidity around 60% according to my weather app. Run up Telegraph Rd at 45 mph for 15 minutes then hit the highway for a 20 min run. Running 65-70 with the AC on. Temp climbed up to 210*. I would cycle the air off but temp wouldn't drop before I'd be uncomfortable and turn it back on. Stopped for about 1.5 hours at Vanguard Motor Sales open house, car cooled down, then back over to the Telegraph cruise. Now it's in the upper 80's for the 20 min run. Temp climbs to 215* halfway through and peaks at 220* before I get off the highway. Now I'm in stop and go cruise traffic so I shut off the air, open the windows and turn the heat on. Temp drops to 210* before I stop at Motor City Solutions for their open house and let the car idle where the temp drops to 205*. Shut er down and sit for an hour before head home 10 mins away.
Observations:
At the stops the radiator didn't spit anything until I got home. Weird cause the temp was at 205* when I shut it down. I checked for pressure in the upper hose at each stop and while there was some pressure in it it wasn't rock hard. Now I know raising the pressure increases the boiling point but does it lower temps also. Past experience tells me the hose should be rock hard when it's that hot. Even though the cap was new in 2014 I think I'll pick up a new one.
Any other ideas? Both my hood seals are in place and I'm running the fan shroud. Maybe my termostat isn't opening all the way. Should I install a high flow thermostat?
I'll pick up a new cap and hopefully can make some more test runs before the planned 1 3/4 hour trip in 6 weeks.
A little back history: 2014 engine was rebuilt pretty much stock specs, bored .030 over. Radiator recored with extra capacity. New thermostat 180*. Still running the stock fan and original fan clutch. Temp would run 190* and if I made some hard runs from a stop it would climb to 195*. If I was stuck in cruise traffic on a mid 80's day it would climb to a tick over 200* but if I popped it in neutral and increase the rpm's it would come back down.
2016 got the AC up and running. Naturally the temp would run 5* or so warmer but nothing to be concerned about. Bare in mind the temps I'm sighting are from an aftermarket gauge. Two years ago made a 1 3/4 hour run to a weekend car show, fall temps (mid 70's to low 80's?), air on with no problems.
Ok, yesterday mid 80's, high humidity around 60% according to my weather app. Run up Telegraph Rd at 45 mph for 15 minutes then hit the highway for a 20 min run. Running 65-70 with the AC on. Temp climbed up to 210*. I would cycle the air off but temp wouldn't drop before I'd be uncomfortable and turn it back on. Stopped for about 1.5 hours at Vanguard Motor Sales open house, car cooled down, then back over to the Telegraph cruise. Now it's in the upper 80's for the 20 min run. Temp climbs to 215* halfway through and peaks at 220* before I get off the highway. Now I'm in stop and go cruise traffic so I shut off the air, open the windows and turn the heat on. Temp drops to 210* before I stop at Motor City Solutions for their open house and let the car idle where the temp drops to 205*. Shut er down and sit for an hour before head home 10 mins away.
Observations:
At the stops the radiator didn't spit anything until I got home. Weird cause the temp was at 205* when I shut it down. I checked for pressure in the upper hose at each stop and while there was some pressure in it it wasn't rock hard. Now I know raising the pressure increases the boiling point but does it lower temps also. Past experience tells me the hose should be rock hard when it's that hot. Even though the cap was new in 2014 I think I'll pick up a new one.
Any other ideas? Both my hood seals are in place and I'm running the fan shroud. Maybe my termostat isn't opening all the way. Should I install a high flow thermostat?
I'll pick up a new cap and hopefully can make some more test runs before the planned 1 3/4 hour trip in 6 weeks.