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Username	Post: Strange overheating problem--any ideas?
2tone70 Forum Newbie Posts 13	11-21-11 04:16 PM - Post#2160442 I'm back again looking for more suggestions: have drove the truck occasionaly for 2 yrs with no overheating problems. Took it out the other day and turned the heater on and it began to overheat again--just like before from 190 to 230 in about 30 seconds. Shut off the heater and the temp went back down just as fast. Checked for vacum at the heater flow valve mounted on the fenderwell and it has adequate vacum. Removed the valve and inspected. was able to push valve in with screwdriver, hooked it up to hand vacum pump and it didn't move. I am going to bypass it tonight and then test the valve with the original vacum source. I will lso see if it overheats without the valve in. I just don't understand how this valve could have that much effect on the cooling system all it does is regulate flow to the heater core, but the minute I turn the heat on the temp goes up. I drove this truck on 100+ degree days this and the temp guage never got close to hot or even midway. will see what happens tonight and then go from there. The only thing left will be the water pump if all checks out. If it is moving in the reverse direction as mentioned before I guess it could cause a problem with the heater valve. Dazed and confused

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Post: Strange overheating problem--any ideas?

2tone70
Forum Newbie
Posts 13

11-21-11 04:16 PM - Post#2160442

I'm back again looking for more suggestions: have drove the truck occasionaly for 2 yrs with no overheating problems. Took it out the other day and turned the heater on and it began to overheat again--just like before from 190 to 230 in about 30 seconds. Shut off the heater and the temp went back down just as fast. Checked for vacum at the heater flow valve mounted on the fenderwell and it has adequate vacum. Removed the valve and inspected. was able to push valve in with screwdriver, hooked it up to hand vacum pump and it didn't move. I am going to bypass it tonight and then test the valve with the original vacum source. I will lso see if it overheats without the valve in.

I just don't understand how this valve could have that much effect on the cooling system all it does is regulate flow to the heater core, but the minute I turn the heat on the temp goes up. I drove this truck on 100+ degree days this and the temp guage never got close to hot or even midway. will see what happens tonight and then go from there. The only thing left will be the water pump if all checks out. If it is moving in the reverse direction as mentioned before I guess it could cause a problem with the heater valve. Dazed and confused

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