Changed thermostat, now intermittent heaters?

[Paulie031]

Hi peeps I've changed the thermostat in my car and it all bled up well etc. Used it for work this morning and heaters best they've been since I've owned it.

Finished work and on the way home couldn't get the heaters warm but the car didn't overheat or go past halfway on the temperature gauge. Any ideas? Thanks

 

[Krarl]

What engine mate? It could have been an air pocket, sometimes they appear to be fine and then it'll burp a big bubble up

What's the coolant level like too?

 

[Paulie031]

Clio 172, coolant level is fine even released the cap and only a little pressure came out.

 

[plees]

Did you bleed it from the bolt on the thermostat?

 

[Paulie031]

Did you bleed it from the bolt on the thermostat?

Yes 🙂

 

[Krarl]

Take it out for an extended drive, sometimes my 172 heaters get really hot and other times theyre just lukewarm

 

[dann2707]

Yeah sounds like an air bubble has made its way to your heater matrix.
It should sort itself out over time. Usually driving over hills will sort it

 

[Paulie031]

Thanks for the replies folks 😊

 

[Robbie Corbett]

I find a right good thrashing followed by jacking the front up and another re-bleed has never failed on any car even cars which are a total paint to bleed normally!

 

[Paulie031]

Just to update this, heaters work fine now however if you choose to have them off completely from cold then say activate them when the engine is warmer the blowers still blow cold. Everything else works fine so wondering is there some sort of valve controlling this part of it that's perhaps faulty?

 

[Pistachio]

Are you sure that isn't the climate control cog causing that? When there is air pressure on it while driving it can slip and fail to change the blowers intake position

 

[Ol’ Tarby]

Check the "heaters only blowing hot air" thread mate

 

[Paulie031]

Are you sure that isn't the climate control cog causing that? When there is air pressure on it while driving it can slip and fail to change the blowers intake position

Check the "heaters only blowing hot air" thread mate

Thanks folks, the heater matrix pipes are hot so I know it's circulating. What you say makes sense