Interior fan not blowing hot air

[Michelleywelly]

As above, maximum hot temperature and not blowing hot air inside the car. does anyone know any reasons why? the relay has been re-newed and the fan is still working on numbers 2,3, and 4 by the switch. also have to give the fan a thump to get it working sometimes.

any ideas?

Cheers!!

[javalin]

heat exchanger faulty or airlock in coolant

[Seanl]

Whats your water temp like? Also what car? Old ones suffer with dodgy bypass valves or blocked heater matrices.

[Michelleywelly]

Whats your water temp like? Also what car? Old ones suffer with dodgy bypass valves or blocked heater matrices.

Hi there, thanks for the reply.

its a Mk 4 (1999) golf

she has had the tendency to over heat. but this is quite rare. is this a job for auto technicians?
i am a bit wary to send my car into garages, as they do work that doesnt need doing....or say theyve done the work when they havent. i try to do things myself. but this heater has confused the hell out of me.............

[Michelleywelly]

heat exchanger faulty or airlock in coolant

hi there, thanks for that 

how would i know for defo?? coz these garages around here charge by the hour 

even then, they tell u something else different is wrong with the car 

[javalin]

try bleeding it - there is a sticky somewhere - but essentially, start it from cold with the expansion cap off, let it warm up (will take ~15mins) and massage coolant hoses.  Once its hot and the t-stat is open, all hoses including radiator will be hot.  Switch off and put cap back on.  Oh and put dial in cabin to full hot to let water/air flow.

if its still cold then its the heat-exchanger.

James

(PS - assumes that you have coolant in it???)

[dilbert]

Sounds like a thermostat mate. Worth a try only 6quid from s.c motor factors.

[javalin]

not the thermostat.

[dilbert]

not the thermostat.

?

Stat can cause car to overheat and under heat taking ages to get heater hot

[javalin]

but some heat would come into the cabin - particularly when stationary.