Raoul Ross
Junior Member
- Joined
- Jan 7, 2025
- Posts
- 10
- Reaction score
- 2
- Location
- Wisconsin
- First Name
- Raoul
- Truck Year
- 1985
- Truck Model
- C10 Suburban
- Engine Size
- 5.7
So, the problem continues! Replaced the coolant flow 'valve' on the intake but it still won't heat up. Water flow from the heater core into the radiator certainly was reduced to almost half what it was but using an infrared thermometer in my heated shop it still only gets to ~150. There are a couple of other things I noticed...
1. Coolant flows through the radiator immediately. Not very much but it does. I did drill an 1/8" hole through the thermostat flange to prevent an air pocket but this appears to be a little more than I would think, thermostat stuck open? I'll probably get another one, it's not easy to replace!
2. The "clutch" fan runs at engine rpms, it doesn't speed up *or* slow down by itself. Engine off it easily turns. Is this cooling the radiator too much? The owner told me it had been replaced within the last 2 years, is it defective? IIRC they usually roar at cold start and then slow down, this one doesn't do that.
Pic of the coolant flow 'valve', new one on the right. An obvious difference!
1. Coolant flows through the radiator immediately. Not very much but it does. I did drill an 1/8" hole through the thermostat flange to prevent an air pocket but this appears to be a little more than I would think, thermostat stuck open? I'll probably get another one, it's not easy to replace!
2. The "clutch" fan runs at engine rpms, it doesn't speed up *or* slow down by itself. Engine off it easily turns. Is this cooling the radiator too much? The owner told me it had been replaced within the last 2 years, is it defective? IIRC they usually roar at cold start and then slow down, this one doesn't do that.
Pic of the coolant flow 'valve', new one on the right. An obvious difference!
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