Mauricej41
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- Joined
- Apr 6, 2018
- Messages
- 10
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- 56
Hi. All pipes are connected etc, yet still no heat comes in the car even when knob is turned on red. Please help
First does engine coolant temperature reach normal, centre of gauge/ 90 degrees approx.Hi. All pipes are connected etc, yet still no heat comes in the car even when knob is turned on red. Please help
Ok tell what if the pipes going through the bulkhead don't feel the same temperature as those around the engine what then?First does engine coolant temperature reach normal, centre of gauge/ 90 degrees approx.
Then does the two heater pipes going through the bulkhead feel the same temp as coolant pipes around engine as in top and bottom hoses etc.
If yes to all that then most likely a control flap or cable on heater box not functioning correctly.![]()
When the engine is fully warmed up and the temp. gauge is in the middle, then all the water hoses should feel equally hot, almost unbearable to hold for more than 30 seconds or so.Ok tell what if the pipes going through the bulkhead don't feel the same temperature as those around the engine what then?
I have reverse flushed heater matrix/radiator on vehicles many times, safe at low pressure and as long as the outlet isn't blocked as cooling system probably on older vehicles can stand 15psi (1Bar) only and garden hose could often have 40psi or more.@Mauricej41 did you figure out the issue? As the Uno is quite old, it's quite possible you've got rust blocking the heater core. In the past I've cleaned mine out with a garden hose pipe. The hoses that go through the firewall should be able to snugly fit a hose through.
You could try running water backwards through the heater and see if that clears it. There are 2 jubilee clamps you'll have to undo (maybe get new ones if they're the special kind that need a special tool to remove). Cut 1m or so off the end of your garden hose pipe to redirect the dirty water out of your engine bay, and then insert it into the bottom hose through the firewall. Insert the hose from your tap into the top one, and get someone to very slowly open it up. You may need to switch directions a few times if the rust is clogging up the valve or core.
With mine I'm trying to remove the whole centre console with the heater core, as mine is now way too blocked.
I can't recall re Fiat Uno , though in the past all vehicles had water valves but nowadays the manufacturer uses the heater matrix/radiator as another way of controlling engine coolant temperature, so just using flaps to duct the heat flow.Also i seem to recall that on the Uno heater unit the temperature control knob drives a cable that operates a water valve on the side of the main unit. This valve has an adjustable linkage that may have slipped, or the cable detached of the valve is broken.