Q: Thermostat isn't getting any hot water to open up.

asked by on

Symptoms: Over heating Cold air only out of heater Reserve tank overflowing

I've flushed my radiator and engine, however the heater pipes were clogged up.

As the car cools I can see the water pipe out of the engine implodes. When I open the radiator cap is sucks in air like it was gasping for air.

Overheating temp gauge, the water pipe out of the engine is hot however the one at the bottom that leaves the radiator and leads to the thermostat housing is cold and high pressured.

I suspect the hot water out of the engine should be passing through the radiator and cooling, however not so cool that the thermostat won't open to replenish the water in the engine block.

Any ideas of what could be causing this?

My car has 70000 miles.
My car has a manual transmission.

The hoses are collapsing due to the radiator cap and passage to the overflow is clogged. The cap needs to be replaced and the passages to overflow cleared. If the thermostat is not opening then replace it also. Make sure to flush out entire system and replace radiator and heater core if clogged and cannot be cleared.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Thermostat isn't getting any hot water to open up.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Battery isn't holding a charge even after replacement. Could it be the alternator?

Hi there. The most common cause of a battery not holding a charge can be a faulty alternator. Other causes like a voltage regulator, PCM (power control module), or an electrical short. In plain terms, the battery is simply there...

Q: Heater core or thermostat

If the engine temperature, as measured on the dash gauge, does not reaching the normal operating range within "roughly" 5 miles or so of driving, then a possibility is the cooling system thermostat is stuck open. Among other things, a...

Q: Just bought a 2017 altima and I'm hearing a scraping sound when I step on the brakes what is wrong with my brand new car? And will

Hi there. I would seriously doubt that you have brake damage, but this is something that you should immediately bring to the attention of your Nissan dealership where the car was purchased. It's possible that there is a leaf or...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...