jimmyd
Newbie
1993 k3500 7.4 tbi nv4500.
Truck will surge than almost stall and repeat when heater is turned on. I recently had to replace the lower radiator hose. Since I had to drain most of the coolant anyways I thought it be a good time to replace thermostat and cts. The cts is the cheap oreillys brand which I read could be an issue. Problem is I just got the truck and never turned on the heater before so I'm not sure if it had the problem before I installed the new cts and thermostat. At first it would throw dtc 35 intermittently so I put a new IAC which didn't fix it. Sometimes the check engine light will come on briefly and when it does the truck seems to run better. It gets better as the truck warms up but never fully goes away. Also seems like it takes a long time to warm up. Have been trying to find anyone experiencing this same problem but have yet to find anything.
Truck will surge than almost stall and repeat when heater is turned on. I recently had to replace the lower radiator hose. Since I had to drain most of the coolant anyways I thought it be a good time to replace thermostat and cts. The cts is the cheap oreillys brand which I read could be an issue. Problem is I just got the truck and never turned on the heater before so I'm not sure if it had the problem before I installed the new cts and thermostat. At first it would throw dtc 35 intermittently so I put a new IAC which didn't fix it. Sometimes the check engine light will come on briefly and when it does the truck seems to run better. It gets better as the truck warms up but never fully goes away. Also seems like it takes a long time to warm up. Have been trying to find anyone experiencing this same problem but have yet to find anything.